Dhamodaran Santhanagopalan

• Ph.D (Physics)
• Professor at Amrita Vishwa Vidyappetham (Kochi Campus)

Molybdenum disulfide (MoS2) emerges as a promising material for advanced energy storage devices, particularly batteries and supercapacitors. As the demand for efficient and sustainable energy storage solutions grows, MoS2 attracts considerable attention due to its unique properties such as high electrical conductivity, substantial surface area, and...

Energy storage technologies necessitates efficient, cost effective, and durable storage systems like Li‐ion batteries (LIBs), with high energy density. Emerging 2D materials like MXenes have become significant for battery applications. Herein, titanium carbide (Ti3C2Tx) synthesized and lattice engineered via ‐OH surface terminations removal by ther...

Lithium titanate (Li4Ti5O12-LTO) having high chemical stability and zero strain property has attracted significant research interest as negative electrode material for Li-ion storage applications. However, its poor conductivity mainly owing to the presence of vacant Ti-3d states results in poor electrochemical performance especially at high rates....

The need for revamping spent graphite (SG) from battery waste of commercial lithium‐ion batteries and employing it as a source for the synthesis of graphene oxide (GO) is focused. Thus, this work emphasizes the study of GO sheets, synthesized via modified Hummer's method from spent graphite (SG‐GO) as cathodes for an aqueous zinc ion battery (AZIB)...

Advanced lithium‐ion batteries (LIBs) for electric vehicle applications are on demand recently. Graphite anode in LIBs provides with good cycle life but limited capacity. On the other hand, silicon that possesses high capacity but significant volume changes during cycling limits its practical use. Hence, nanocomposites of graphite and nano silicon...

For a clean and sustainable world, energy storage systems like Li-ion batteries (LIBs) will play a vital role due to their wide range of applications. The exponential growth of batteries will lead to the generation of a substantial number of failed batteries in the near future. As a consequence, recycling will play a crucial role to reduce e-waste...

Efforts to make low-cost photovoltaic devices are a major part of today’s energy conversion research. The abundant, cheap, highly conductive, and easy-to-tune nature of carbon allotropes makes carbon-based nanocomposites more attractive to use in dye-sensitized solar cells (DSSC). DSSCs are photo electrocatalytic solar cells that have a device arch...

Sodium-ion battery (SIB) technology started to bloom along with lithium-ion batteries (LIBs) as a supportive energy source to alleviate the cost of lithium sources for the development of energy storage devices and electric vehicles. Layered cathode materials are considered potential candidates to produce high-energy-density batteries. Among the lay...

The environmental and economic impact of Co-based catalysts necessitates the use of a more environmentally friendly and less expensive catalyst, such as CuO. A cobalt-free CuO catalyst was developed via a simple low-temperature hydrothermal process. The efficiency of the catalyst was analysed for the dehydrogenation of NaBH4 as well as NH3BH3. Comp...

The low capacity of the graphite anode has initiated a lot of interest in low cost, earth-abundant, high-capacity transition metal oxides like ZnMn2O4 (ZMO) for Li-ion battery applications. This study leads to a facile precipitation method followed by structural, morphological, and electrochemical investigations on ZMO. Different electrolyte formul...

Graphite being the most used anode in commercial lithium ion batteries (LIBs), haven't receive much attraction in recycling research. Also, graphite has limited attraction for Na-ion battery (NIB) applications due to poor intercalation. Tackling both these issues together, we present energy efficient recycling strategies for spent graphite (SG) del...

Cobalt-free layered cathode materials are of interest for advanced Li-ion batteries especially, layered Li[Li0.2Ni0.2Mn0.6]O2 nanoparticles (Li- and Mn-Rich, LMR). Herein, we present results of two different particle sizes controlled by the lithium precursors during sol–gel synthesis. LMR with particle size ~ 40 nm (LMR_40) exhibited better perform...

Transition metal chalcogenides have been described as promising electrode materials for supercapacitors due to their low electronegativity, suitable electrical conductivity, comparatively higher specific capacitance, and favorable electrochemical redox regions. However, the poor electrical conductivity and substantial volume fluctuations provide a...

NASICON-type vanadium-based cathodes have received significant attention due to the higher stability and theoretical capacity associated with polyanionic groups and vanadium redox-chemistry. However, improvements in structural stability and electronic conductivity to enhance the electrochemical performance are still a hot topic of research. In the...

Lithium ion batteries (LIB) are the domain power house that gratifies the growing energy needs of the modern society. Statistical records highlight the future demand of LIB for transportation and other high energy applications. Cathodes play a significant role in enhancement of electrochemical performance of a battery, especially in terms of energy...

Metal oxides are considered as potential anodes for sodium-ion batteries (SIBs). Nevertheless, they suffer from poor cycling and rate capability. Here, we investigate conductive polymer coating on Co3O4 nanoparticles varying with different percentages. X-ray diffraction, electron microscopy and surface chemical analysis were adopted to analyze coat...

Extending the charge cutoff voltage of LiCoO2 (LCO) beyond 4.2 V is considered as a key parameter to obtain higher energy densities. Following gaps have been identified based on a thorough literature survey especially for higher cutoff voltage of nanoscale engineered LCO cathodes, (i) different metal oxides and metal fluoride surface coatings have...

A facile process for the preparation of alkali ion containing Prussian Blue cathodes by chemical reduction and their battery applications is reported. Two cathodes, LixFe[Fe(CN)6] and NaxFe[Fe(CN)6] have been prepared...

We report a simple, vapour-phase conversion of two prominent metal oxalates into metal phosphide nanostructures (CoP and FeP) and their application in three alkali ion batteries (Li, Na and K). This method was a low temperature, scalable, single step conversion process using metal oxalates and sodium hypophosphite as originators. Apart from the vap...

Rechargeable lithium-ion batteries are dominating the energy storage market with a current market value of $50 billion. However, the exponential production of lithium-ion batteries is accompanied by an increased backflow as environmentally hazardous spent/end-of-life batteries, which need to be recycled efficiently. Herein, we demonstrate the possi...

Recycling and regeneration of spent Li-ion batteries have become an important research topic for a sustainable future. This is predominantly because of the exponentially increasing production & usage of lithium ion batteries (LIBs) leading to an intense reflux as spent/failed/end-of-life batteries in the near future. Research on recycling/regenerat...

Abstract Materials with high-power charge–discharge capabilities are of interest to overcome the power limitations of conventional Li-ion batteries. In this study, a unique solvothermal synthesis of Li4Ti5O12 nanoparticles is proposed by using an off-stoichiometric precursor ratio. A Li-deficient off-stoichiometry leads to the coexistence of phase-...

Silicon is a potential anode material for advanced lithium ion batteries due to its high capacity and low voltage. Interfaces play a crucial role in Coulombic efficiency and cycling stability hence interfaces engineering is inevitable to improve performance of silicon. In the present work, ultra-thin TiO2 interlayers have been introduced between th...

We present here the synthesis of three different types of Cu2FeSnS4 (CFTS) nanoparticles with the help of solvothermal route. Different chain length of ethylene glycol (EG) (PEG-200, PEG-400 and PEG-600) were used as solvent in hydrothermal process which resulted in stannite phase CFTS nanoparticles which was confirmed by XRD analysis and other cha...

Attracted by high theoretical capacity, CuO has emerged as a promising anode of Li-ion batteries. However, poor electronic conductivity, cycling instability and first cycle irreversibility is still a hindrance for end-application. To address these concerns in battery applications, for the first time, cobalt induced CuO nanobelt-like morphology is r...

A scalable preparation of in situ N-doped disordered carbon nanosheets from reduced melamine formaldehyde resin is demonstrated. For the first time, nanosheets prepared by such a process have been tested as anodes for lithium ion and sodium ion batteries. Li-ion battery half-cell delivers a reversible capacity of about 500 mA h/g at a specific curr...

Intrigued by the unlimited availability, inexpensiveness and high redox potential of sodium, rechargeable sodium ion battery (SIB) has attracted significant research interest as a supplement to lithium ion batteries. However, an optimized electrolyte for SIB was still not developed which in turn affect the performance of electrode materials. Herein...

Orthorhombic MoO3 is a unique 2D material that undergoes lithium intercalation at higher voltage (above 2 V) and conversion reaction at lower voltages (below 1.5 V). Due to this dual reaction mechanisms, MoO3 can serve as cathode and anode as well. Herein, we report two new full-cell chemistries based on MoO3 cathode against, (i) prelithiated MoO3...

Lithium ion batteries are dominating the energy storage market owing to its capability in powering portable electronics to electric vehicles. However, the power capabilities of these batteries are still relatively low limiting their applications in fast charging. In this paper, we report a strategy in elevating the rate capability of lithium titana...

Here, we report reactive DC-sputter deposited Co3O4 thin films as a promising and stable Li-ion battery anode. Thin films were deposited on stainless steel by reactive sputtering of cobalt target in O2 atmosphere. X-ray diffraction and X-ray photo electron spectroscopy confirm the formation of Co3O4 crystal structure and absence of other impurities...

Titania based anodes have received considerable interest due to its cycling stability and improved safety. Here, we report the electrochemical performance of high surface area anatase TiO2 nanoparticles synthesized via solvothermal technique. Prepared anatase TiO2 nanoparticles were below 15 nm in average particle size exhibiting high surface area...

Electrospraying-based synthesis of NiCo2O4 (NCO-ES) nanoparticles that exhibit long cycle life and high rate capability is reported. The results are compared with a conventionally prepared NiCo2O4 sample by direct annealing (NCO-DA). The structure and morphology of NCO-ES and NCO-DA nanoparticles have been characterized by X-ray diffraction, transm...

Focusing on additive-free electrodes, thin films are of typical interest as electrodes for lithium ion battery application. Herein, we report the fabrication of TiO2 thin films by spray pyrolysis deposition technique. X-ray diffraction and transmission electron microscopic analysis confirms the formation of anatase TiO2. Electrochemical evaluation...

Surface modification of LiCoO2 (LCO) gained much attention as it could play a prominent role in improving electrochemical performance and structural stability. Herein, we report an ultra-thin TiO2 coating on LiCoO2 (LCO-TiO2) as a potential candidate to overcome the electrochemical, structural instability and interface issues of the bare-LCO. The s...

Critical challenge for Li-ion battery electrodes is to provide high energy density, power density, excellent cycle life combined with safety and sustainability. Increasing conductive additives concentration in composite electrodes enables relatively higher power density but compromises energy density. Energy density increment can be attained by fab...

Solid-state electrolytes are a promising replacement for current organic liquid electrolytes, enabling higher energy densities and improved safety of lithium-ion (Li-ion) batteries. However, a number of setbacks prevent their integration into commercial devices. The main limiting factor is due to nanoscale phenomena occurring at the electrode/elect...

Single-pot synthesis of dual-phase spinel-Li4Ti5O12 and anatase-TiO2 (LTO-TiO2) nanoparticles over the entire phase-fractions ranging from pure LTO to pure TiO2is conducted. Process over the complete range enabled the identification of a unique weight ratio of 85:15 (LTO:TiO2) that provide the best combination of capacity, rate capability and cycli...

Conversion materials with high specific capacity are of interest to improve energy density of Li-ion batteries. Here, we present results concerning hydrothermally synthesized CuO nanoplates that exhibit high specific capacity of 800 and 698 mAh/g at C/2 and 1C rates respectively and 180 mAh/g at a high rate of 30C. The electrodes exhibit high Coulo...

Spinel structured nanomaterials have shown good stability for lithium ion storage applications. Among all, Li4Ti5O12 (LTO) anode and LiMn2O4 (LMO) cathode is a potential combination for high energy and high power applications. In the present work, we utilize this specific combination to fabricate full-cells in combination with carbon nanostructures...

LiMn2O4 (LMO) cathode exhibiting improved electrochemical performance is reported. X-ray diffraction confirms spinel cubic structure in the bulk with localized structural integrity confirmed by high-resolution Transmission Electron Microscopy (TEM) analysis showing lattice fringes with spacing of 0.48 nm corresponding to (111) of spinel LMO. X-ray...

A scalable wet chemical process for conformal TiO2 coating on silicon nanoparticles is investigated for Li-ion battery applications. The stable core-shell composite nanoparticles along with polyacrylic acid (PAA) binder was studied as an anode in Li-ion batteries and compared with bare-Si as a control. By limiting the charge capacity to 1500 mAh g⁻...

Energy storage technologies are sensitively dependent on electrode film quality, thickness and process scalability. In Li-ion batteries, using additive-free titania (TiO2) as electrodes, we sought to show the potential of spray pyrolysis-deposited nanoengineered films with thicknesses up to 135 µm exhibiting ultra-high areal capacities. Detailed el...

High aspect ratio, electrospun CuO nanofibers have been fabricated and tested for its electrochemical performance as lithium ion battery anode. These nanofibers are composed of CuO nanoparticles about 35–40 nm in size forming good inter-connected network. Fabricated half cells maintained specific capacity of 310 mAh g⁻¹ at 1C rate for 100 cycles an...

Recently, there has been significant research interest towards sustainable chemical synthesis and processing of nanomaterials. Human urine, a pollutant, requires energy intensive processing steps prior to releasing into rivers and oceans. Upcyling urine has been proposed and practiced as a sustainable process in the past. Doping is one of the forem...

Behaviors of functional interfaces are crucial factors in the performance and safety of energy storage and conversion devices. Indeed, solid electrode-solid electrolyte interfacial impedance is now considered the main limiting factor in all-solid-state batteries rather than low ionic conductivity of the solid electrolyte. Here, we present a new app...

NiFe2O4 nanoparticles fully anchored within a carbon network were prepared via a facile pyro-synthesis method without using any conventional carbon sources. The surface morphology was investigated using field-emission scanning electron microscopy, which confirmed the full anchoring of NiFe2O4 nanoparticles within a carbon network. The primary parti...

The effects of laser wavelength (355nm and 532nm) and laser pulse energy on the quantitative analysis of LiFePO4 by atom probe tomography are considered. A systematic investigation of ultraviolet (UV, 355nm) and green (532nm) laser assisted field evaporation has revealed distinctly different behaviors. With the use of a UV laser, the major issue wa...

Understanding the role of interfaces is important for improving the performance of all-solid-state lithium ion batteries. To study these interfaces, we present a novel approach for fabrication of electrochemically active nano-batteries using focused ion beams and their characterization by analytical electron microscopy. Morphological changes by sca...

Improved methods for the flux growth of single crystals of the important battery material LiFePO4 have been developed, allowing the facile preparation of single crystals up to 1 cm across with well-developed facets at relatively low temperatures. The structural characterization of these samples by both powder X-ray diffraction and single crystal di...

Fabrication of micro features by uED-milling process requires machining of tool electrode and applying them in multi pass trajectory. A real concern occurs when the tool has to be prepared before each pass and put in to trajectory without disturbing the settings. This issue is attested here by combining the process setup of uED-milling and Block El...

Focused ion beam (FIB) technology is widely used for the fabrication of prototype mechanical/ electromechanical devices in submicron and nano domain. There are not many reports on the dynamic characterisation of the nanomaterials is available in the literature. Very little is known about the changes in the mechanical properties which occur at nano...

Microelectric discharge plasma characteristic using optical emission spectroscopy and its applications are reported. Planar semiconductor as well as metal electrodes as anode and metal cylindrical electrode as a cathode are utilized. Plasma parameters such as plasma temperature and electron density were measured by noncontact optical emission spect...

Micro electric discharge machining (µ-EDM) process is being used to machine complex shapes on silicon. In specific, dry-µ-EDM can be used to process assembled or semi assembled silicon products. However, there is lack of investigation on the effect of single pulse discharge machining and its plasma characteristics on silicon. Hence, in this paper w...

GaN polyhedrons and nanowires have been synthesised on various substrates using chemical vapour deposition with gold catalysis. We observed hexagonal polyhedrons on silicon and pyramid-like nanostructures on GaN and AlN substrates with a size of about 2 μ m in all the cases. The nanostructures were subjected to field emission scanning electron micr...

The wide band gap semiconductor, GaN, has emerged as an important host for rare earth-electroluminescence. The annealing behaviour and lattice site location of Er implanted into GaN were studied with the Rutherford Backscattering Spectrometry (RBS)/channelling and photoluminescence (PL) techniques. Also Er site dependence on the annealing temperatu...

GaN nanowires were grown using chemical vapor deposition with controlled aspect ratio. The catalyst and catalyst-diameter dependent growth kinetics is investigated in detail. We first discuss gold catalyst diameter dependent growth kinetics and subsequently compare with nickel and palladium catalyst. For different diameters of gold catalyst there w...

The discussion presented in this work is about evaluation of physical behavior of µED-milling process based on channel shape, form and surface quality. µED-milling process is gaining lot of interest in recent times in micro manufacturing to generate complex shapes. Tool rotation and traverse which are not an inherent part of EDM process become impo...

Machining of microchannels (µ-channels) on hard conducting materials can be performed effectively using a micro electric discharge milling (µED-milling) process. The method of bulk machining is considered in this work, as it takes less machining time than conventional layer-by-layer machining. However, the tool wear in this method occurs both in th...

Epitaxial AlGaN/GaN layers grown by molecular beam epitaxy (MBE) on SiC substrates were irradiated with 150 MeV Ag ions at a fluence of 5×1012 ions/cm2. The samples used in this study are 50 nm Al0.2Ga0.8N/1 nm AlN/1 μ m GaN/0.1 μ m AlN grown on SI 4H-SiC. Rutherford backscattering spectrometry/channeling strain measurements were carried out on off...

An attempt was made to characterize the dry microelectric discharge machining (μ-EDM) plasma systematically by using optical emission spectroscopy. In order to characterize the plasma and its parameters such as plasma temperature, electron density, Debye length, and gamma parameter, the optical spectra were recorded for different energies and with...

Semi-continuous silver film templates are fabricated by focused ion beams (FIB), and surface-enhanced Raman scattering spectra from C60-fullerene deposited on these templates are recorded. Films of silver deposited by thermal evaporation are dry-etched by the ion beams with various etching times. The films tend to become semi-continuous as the etch...

GaN nano flowers were grown on various commercial substrates by a simple catalyst free chemical vapor deposition (CVD) technique. The size and shape of the nanostructures were characterized by scanning electron microscopy (SEM). The influence of the substrate, growth temperature, and ammonia flow rate on the size and shape of the nano-flowers were...

GaN nanostructures have been synthesized on silicon substrates using chemical vapor deposition. Prior to growth silicon substrates were engraved using stainless-steel micro-tips. Straight as well as twisted nanowires were observed along the engraved lines/regions. Straight nanowires were few tens of microns in length and the twisted ones were few m...

GaN nanostructures with high degree of growth mode control in a simple chemical vapor deposition (CVD) system are reported. The shape of nanostructures can be varied from 1-D nanowire to a 3-D polyhedron depending on the growth conditions. A systematic control over the growth parameters leads to growth mode transition from 1-D to 3-D GaN nanostruct...

Elemental identification of material is a prime most important in material science field. Electric discharge is used for material elemental identification with optical emission spectroscopy. During electric discharge machining between two electrodes plasma is generated which emits intense radiation in the UV-Visible region. The generated plasma cap...

To improve the performance of the Electric discharge machining (EDM) process it is of interest to characterize the plasma involved. Plasma temperature needs to be measured as an initial phase of plasma characterization. Non-contact optical emission spectroscopy has been used to measure the plasma temperature. The plasma temperature and crater morph...

Radiation hardened microelectronics compatible and tunable light emitting devices are essential for the integration of electronic and optoelectronic devices. Porous or nano‐crystalline silicon seems to be a promising material for accomplishing this task. Ion beam patterned structures of light emitting silicon nanoparticles can be used for achievin...

Straight and zig-zag isolated GaN nanowires were investigated for their electrical properties using focused ion/electron beam (FIB/FEB) deposited platinum contacts. The straight and smooth nanowire with FIB contacts was non-ohmic and relatively high leakage current was observed under reverse bias. The straight and smooth nanowire with FEB contact s...

How does your nano-garden grow?

GaN grown on sapphire by hydride vapour phase epitaxy is probed by ion channeling, Raman and cathodoluminescence (CL) spectroscopy. Channeling and Raman spectroscopy indicate that the quality of GaN is very good. Spot mode CL measurement signifies intense near band edge emission as compared with yellow luminescence (YL). During scanning over an are...

Fabricating micro/nano-features in devices and largescale production with short lead times is challenging, and many individual and hybrid processes have been developed to meet this challenge. Among nonconventional processes, micro-electric discharge machining (μ-EDM) has many advantages due to the possibility of precise and accurate 2D and 3D machi...

The deposition of metals on various substrates with specific patterns at smaller scales is quite challenging. Lithography has been widely used in the micro-scale for polymers and semiconductors. Micro-Electric Discharge Deposition (μ-EDD) is one of the direct write techniques used in creating micro/nano features on semiconductors and metals which h...

Micro electric discharge milling (μED-milling) process is gaining lot of interest in the area of microfabrication specifically for hard to machine materials. Any complex shape can be generated with a controlled motion of cylindrical tool in a predefined path similar to conventional micromilling. In this method the material removal mechanism in tool...

GaAs processed using gallium-focused ion beams for the fabrication of photonic devices mostly results in gallium nanodots on the surface. These gallium nanodots may produce unwanted effects and deteriorate the optical and electrical properties of the devices. We have investigated the FIB processing of GaAs with and without exposure to an insulator-...

A nano-mechanical switch has been fabricated and its switching action has been demonstrated. The device utilises the phenomenon of bending of Pt nanopillars and cantilevers induced by focused ion beam (FIB). Two skew Pt pillars with equal lengths and different cross-sections have been fabricated subtending an angle of approximately 100° with each...

A nano-mechanical switch has been fabricated and its switching action has been demonstrated. The device utilises the phenomenon of bending of Pt nanopillars and cantilevers induced by focused ion beam (FIB). Two skew Pt pillars with equal lengths and different cross-sections have been fabricated subtending an angle of approximately 1008 with each o...

We present a 'universal' phenomenon of mass accumulation and its sensing on nanostructures due to electron beam cracking of residual gas molecules during electron beam scanning. Though the extent of this phenomenon is limited to a very small increment in mass or thickness, it has significant implications for both the scientific and technological as...

We have prepared germanium nanoparticles embedded in SiO2 matrix by atom beam co-sputtering (ABS) of Ge+SiO2 on Si substrate. The as-deposited films were annealed at various temperatures in Ar+H2 atmosphere and irradiated with various energies with fixed fluence. The pristine and irradiated samples were characterized by Raman, X-ray diffraction and...

GaAs MESFET-based switches suffer from high insertion losses. As an alternative, GaAs RF MEMS have shown great promise due to high isolation, low insertion losses, and wide bandwidths. Some factors constraining the fabrication have been suitable planarization techniques, quality of metallisation, stress in the beams, and elimination of stiction of...

Al0.49Ga0.51N (12 nm)/GaN (13 nm) Multi Quantum Wells of 15 periods are grown on sapphire by MOCVD technique. GaN/AlN, each of thickness 200 nm and 20 nm respectively, are used as buffer layers between substrate and epilayer to incorporate the strain in epilayers. It is a well established technique to engineer the band gap in AlxGa1-xN by adjusting...

Epitaxial GaN layers grown by MOCVD on c-plane sapphire substrates were irradiated with 150 MeV Ag ions at a fluence of 5x10{sup 12} ions/cm{sup 2}. Samples used in this study are 2 {mu}m thick GaN layers, with and without a thin AlN cap-layer. Energy dependent RBS/Channeling measurements have been carried out on both irradiated and unirradiated sa...

The recently developed ion track-based electronic structures of the TEMPOS type have often been filled up with (semi)conducting nanoclusters (NCs) to optimize their operation. Network theory is applied here for the first time to describe the distribution of the ion tracks and the NC, and of the current paths followed by the latter ones. The presenc...

Highly tensile strained InGaAs/InP multi quantum wells have been grown by the LP-MOVPE technique. Such samples were subjected to irradiation with 100 MeV Au8+ ions. These were studied as a function of fluence, then the irradiated samples were annealed by rapid thermal annealing at 700 °C for 60 s in nitrogen atmosphere. We used high resolution X-ra...

An overview is given on a family of novel electronic devices consisting of an insulating layer containing conducting or semiconducting nuclear tracks, deposited on a semiconducting substrate, and connected by at least one back and two surface contacts. Conducting and semiconducting latent tracks may emerge directly from swift heavy ion irradiation....

We explore a novel phenomenon of focused ion beam (FIB) induced bending of carbon nanopillars or cantilever structures. The bending occurs towards the ion beam during scanning. The explanation of this bending has been sought on the basis of a model which considers temperature rise and gradients caused by the impinging ion beam. The process is contr...

GaAs and GaN semiconductors and their heterostructures have been of interest for a few years now, because of their promising applications. Ion beams and other complimentary techniques are used for characterization of the surface and interfaces, to understand the novel properties of these materials. In this work we have reported the use of complimen...

The structural and compositional analysis of strain relaxed InGaAs/InP multi quantum wells (MQWs) have been carried out using high resolution X-ray diffraction (HRXRD), Raman spectroscopy (RS) and Rutherford backscattering spectrometry (RBS). The surface morphology has been investigated by atomic force microscopy (AFM). No satellite peaks have been...

Since a decade the concept emerged to use conducting ion tracks in nano-and micro-electronics, due to their small dimensions. Whereas in a few cases the ion tracks themselves are already conducting, in the majority of all cases the ion tracks have first to be etched to form nanopores, into which (semi)conducting matter is inserted thereafter. The M...

Effects of heavy ion irradiation on InP based structures have been discussed. In specific, recent results on heavy ion irradiation of InP and InGaAs/InP multi quantum wells have been studied as a function of incident ion fluence and electronic energy loss. Studies involve photoluminescence (PL), high resolution X-ray diffraction (HRXRD), raman spec...

The band-structure, interface and surface modification by swift heavy ion irradiation of In0.55Ga0.45As/InP multi quantum wells have been studied using photoluminescence, high resolution X-ray diffraction and atomic force microscopy. Three distinct photoluminescence peaks were observed for as-grown samples at low temperature and at room temperature...