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Genene Tessema Mola

Genene Tessema Mola
University of KwaZulu-Natal, Pietermaritzburg, South Afirca · School of Chemistry and Physics

Ph.D.

About

139
Publications
50,383
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Introduction
Experienced Professor of Physics with a demonstrated history of working in the higher education industry. Currently, working on thin film solar cell technologies. Particularly, organic photovoltaic and perovskite solar cells. Strong education professional with a Master’s Degree focused in Condensed Matter Physics from Addis Ababa University and a Ph.D. degree in experimental Condensed Matter from University of Bonn.
Additional affiliations
January 2011 - present
University of KwaZulu-Natal
Position
  • Professor of Physics
September 2003 - June 2008
Addis Ababa University
Position
  • Professor (Assistant)
April 1999 - February 2003
University of Bonn
Position
  • Ph.D. research
Education
April 1999 - February 2003
University of Bonn
Field of study
  • Experimental Condensed Matter Physics
September 1993 - July 1995
Addis Ababa University
Field of study
  • Semiconductor Physics

Publications

Publications (139)
Article
Silver sulfide (Ag2S) nanoparticles were incorporated into the electron transport layer (ETL) of thin-film organic photovoltaic cells to assist in light trapping and improve charge-transport processes. The solar cells were fabricated in an inverted device architecture design using a solar absorber composed of donor polymer poly[4,8-bis(5-(2-ethylhe...
Article
Full-text available
Silver doped zinc sulfide (ZnS:Ag) metal nanoparticles (NPs) were successfully synthesized and used as a dopant in thin-film organic solar cells (TFOSCs). Core-shell structured ZnS:Ag nano-particle is expected to improve photon harvesting in solar absorber medium. Polymers blend composed of poly-(3-hexylthiophene) (P3HT): [6,6]-phenyl C61 butyric a...
Article
Three polymers with indacenodithiophene (IDT) as the electron-rich unit and phenanthrenequinoxaline (phanQ) or fluorine substituted phenanthrenequinoxaline (FphanQ, 2FphanQ) as the electron-deficient units have been synthesized. The band gaps of PIDT-phanQ, PIDT-FphanQ, PIDT-2FphanQ were estimated to be 1.68, 1.68 and 1.71 eV with a HOMO energy lev...
Article
Full-text available
Silver and Calcium (Ag:Ca) bi-metallic nano-partices have been successfully synthesized using a chemical reduction processes. The nano-partices were intended to be used in the solar absorber layer of thin film organic solar cell (TFOSC) to assist in improving optical absorption and charge transport processes in polymers blend medium. The nanocompos...
Article
Full-text available
Incorporation of metal nanoparticles (NPs) into various layers of organic solar cells (OSCs) has become a popular means of enhancing device performances through increased light absorption by way of plasmon resonance effects. A number of NPs properties and device fabrication parameters should be considered when designing NPs-embedded OSCs for achiev...
Article
Full-text available
The effect of silver doped ZnO (ZnO:Ag) nano-particles in the hole transport buffer layer of thin film organic solar cell was studied in this article. Polymers molecules blend composed of poly(3-hexylthiophene-2,5-diyl):phenyl-C61-butyric-acid-methyl-ester (P3HT:PCBM) was used as a medium of solar absorber to investigate the effect of metal nano-pa...
Article
Low-cost and environmental-friendly solvent processing in organic solar cells (OSCs) are much critical for commercial application. Here, we selected the benzo[1,2-b:4,5-b′]difuran (BDF) terpolymers (PBDF4F-Th2 and PBDF4F-Th5) as the low-cost polymer...
Preprint
Full-text available
Fano resonance is an optical effect that emerges from the coherent coupling and interference (constructive and destructive) between the continuous state (background process) and the Lorentzian state (resonant process) in the plasmonic waveguide-resonator system. This effect has been used in the applications like optical sensors. These sensors are e...
Article
This article explores the effect of bimetallic plasmonic nanocomposites in the solar absorber layers of thin-film organic solar cells (TFOSCs) for possible improvement in harvesting solar energy. To achieve this goal, a new nanocomposite composed of Nickel and Zinc (Ni: Zn) was successfully synthesized by the use of a chemical reduction processes....
Article
Full-text available
Cd-doped ZnO nanocomposite (Cd:ZnO) was synthesized using wet chemistry, which was then incorporated into the photo-active layer of thin film organic solar cell (TFOSC) to assist photons harvesting . The nano-composite (NC) has formed various sized nano-structures that are beneficial to optical absorption and charge transport processes in TFOSC. Th...
Chapter
We intend to report on possible fabrication routes for all types of hexagonal ferrites which are known for their wide area of use and applications. Hexagonal ferrites have now become an intense topic of research as they are the part of most of magnetic recording and data storage applications globally. Hexagonal or popularly known as ‘Heaxa-ferrites...
Article
A tri-metallic nano-particles (NPs) involving Silver, Iron and Nickel (Ag:Fe:Ni) was successfully synthesized using a wet chemical reduction method. The synthesized nano-composite (Ag:Fe:Ni) has exhibited polycrystalline morphology in powder form, which was used as nano-composite in a P3HT:PCBM blend solar absorber layer of the thin film organic so...
Article
Full-text available
In this study, organic solar cells (OSCs) were designed using the solution processing method based on spin coating. The influence of solvent additive (1-chloronapthalene (CN)) and cadmium doped barium nitrate nanoparticle incorporated into the photoactive medium based on poly(3-hexylthiophene-2,5-diyl (P3HT): [6,6]-phenyl-C61-butyric acid methyl es...
Article
Full-text available
Silver doped nickel oxide (Ag:NiOx) nanocomposites (NC) were synthesized using a thermal decomposition method for possible application in thin-film organic solar cells. Two different synthesis products were found from the experiment, which have exhibited different characteristics in terms of colour, structure, and optical properties. These nanocomp...
Article
In this work, we have synthesized a novel benzo[1,2-b:4,5-b’]difuran (BDF) copolymer (F13-R) through introducing an ester-substituted thiophene into the PDiFPBDF-TBz (F13) backbone in aiming to finely tune the molecular stacking...
Article
Solvent additive (SA) treatment is the most effective strategy to obtain highly efficient non-fullerene organic solar cells (NF-OSCs). However, NF-OSCs with SA treatment usually exhibits different or even opposite effect...
Article
Nickel sulfide(NiS) nano-particles are used in the solar absorber medium of thin film organic solar cell (TFOSC) to aid in harvesting solar energy. Solution-processed TFOSCs were fabricated using poly-3-hex-ylthiophene (P3HT) and (6-6) phenyl-C61-butyric acid methyl ester (PCBM) blend photo-active layer with or without NiS nano-particles(NPs). The...
Article
Focussing on visible light active ferrites for high performance removal of noxious pollutants, we report the synthesis of Mg0.5NixZn0.5-xFe2O4 (x = 0.1, 0.2, 0.3, 0.4, & 0.5) ferrite nanoparticle for degradation of reactive blue-19 (RB-19). Lattice parameters calculated using intense X-ray diffraction (XRD) peaks and Nelson-Riley plots (N-R plot) a...
Article
Full-text available
The water management sector is becoming extremely challenging these days because of poor water quality which is due to the presence of noxious pollutants at an alarming level. Herein, we report the synthesis of FeO/ZnO magnetic metal oxide (FZ MMO) and its nanocomposite with polyaniline (FZP). Designed photocatalyst has been characterized by variou...
Article
Silver doped lanthanum phosphate (LaPO4:Ag) nano-composite was successfully synthesized at various concentrations of silver using wet chemistry. The newly synthesized particles were used in the solar absorber medium of thin-film organic solar cells to assist in photons harvesting. The photoactive layer of the solar cell was composed of poly-3-hexyl...
Article
Copper sulphide (CuS) nano-particles were employed in the hole transport layer (HTL) of thin film organic solar cells (TFOSC), to assist in the charge transport processes and improve the photons harvesting. Solar cells were fabricated in the standard bulk heterojunction device architecture using solar absorber composed of poly (3 hexylthiophene) (P...
Article
Full-text available
Zinc sulphide (ZnS) nanoparticles (NPs) were synthesized by low temperature colloidal chemistry to produce stable zinc blend structure. The metallic ZnS NPs were incorporated into poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl C61-butyric acid methyl ester (PCBM) blend photoactive layer to improve the overall performance of organic solar cells (OSC...
Article
Full-text available
Mnx - ZnO(1-x) nanopowders were successfully synthesised through a simple sol-gel method. The samples were annealed at 300 °C to enhance their crystallinity. The lattice structure, morphology and optical properties of the prepared powdered samples were extensively studied using different characterization techniques, confirming the formation of Mnx...
Article
In the quest to improve the optical absorption and electrical transport of poly-3-hexylthiophene (P3HT) and (6-6) phenyl-C61-butyric acid methyl ester (PCBM) blend film, reduced graphene oxide-germanium dioxide nanocomposite (rGO-GeO2) was employed in the photoactive layer of thin film organic solar cells. Bulk heterojunction solar cells (BHJ SCs)...
Article
In this work, a novel benzo[1,2-b:4,5-b′]difuran (BDF)-based polymer (PDiFPBDF-TBz, F13) was designed and synthesized with a wide bandgap of 1.90eV. With advantage of electronegative fluorine and furan units, F13 possessed a deep HOMO level of -5.54eV, which is favorable for higher Voc in polymer solar cell (PSC). When F13 was blended with Y6, the...
Article
Full-text available
Enhanced photocurrent was observed by embedding Cd doped Ba (NO3)2 nanoparticle composite in the photoactive layer of bulk heterojunction organic solar cell. The research was conducted based on P3HT: PCBM blends active layer containing Cd doped Ba (NO3)2 at various concentrations. The best performance of the fabricated devices was found to be depen...
Article
We theoretically demonstrate an ultra-compact plasmonic modulator and switch of sub-micron size using elasto-optic effect with quite acceptable modulation ratio. The device is based on metal-dielectric-metal waveguide structure and uses resonance phenomena. The modulation mechanism originates by electrically changing thickness of dielectric layer m...
Article
Full-text available
Silver sulphide nano-particles (NPs) have been employed as light trapping mechanism in the solar absorber layer of thin film inverted organic solar cell. The synthesized nano-particle has been characterized using high-resolution scanning and transmission electron microscopy (HRSEM and HRTEM), X-Ray diffraction (XRD). The effects of Ag2S NPs in the...
Article
New materials tend to revolutionize scientific community and human race on a larger level. Scientists worldwide have not just been working on some wondrous materials with superior properties but have progressively focused on greener bio-inspired or bio-compatible materials for sustainable development. An increasing number of researchers have been w...
Article
Full-text available
Single and mixed-halide perovskite solar cells (PSCs) have attracted a lot of research attention in recent years due to their solution process-ability, lightweight and excellent photo-electric conversion which are the necessary conditions for low-cost thin-film solar cell technology. The power conversion efficiency (PCE) of solid-state PSCs has ris...
Article
The wide range of the perylenediimide electron acceptors developed for non-fullerene organic solar cells (NF–OSCs) is an essential step to enhance the power conversion efficiency (PCE) of the resulting devices. Here, a novel quasi-two-dimensional electron acceptor (SF-FPDI) based on perylenediimide fused dimer (FPDI) moiety was synthesized, which e...
Chapter
Ceria (CeO2) is an exciting alternative noble metal catalyst, because it has the ability to release and absorb oxygen in the redox system and function as an oxygen buffer. In this study, heterostructured catalysts consisting of CeO2/CdO nanocomposites were successfully synthesized by hydrothermal method in the presence of sodium hydroxide as a redu...
Article
Silver:zinc nanocomposite (Ag:Zn BMNC) was successfully synthesized by chemical reduction method and employed in various layers of the device structure to fabricate efficient thin film organic solar cell. The pho-toactive layer of the solar cell is composed of poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric-acidmethyl-ester (P3HT:PCBM). The nan...
Article
The algal biochar reinforced trimetallic nanocomposite (AlBc TNC) was fabricated by employing facile greener microwave technique. AlBcTNC was explored as a promising adsorbent/photocatalyst designed for the exclusion of malachite green (MG). The prepared AlBcTNC was examined by X-Ray photoelectron spectroscopy (XPS), Scanning electron microscopy (S...
Article
Silver:copper bimetallic nanoparticles (Ag:Cu BNPs) were synthesized by co-reduction of silver and copper ions from silver and copper nitrates aqueous solutions. The effects of the synthesized Ag:Cu nanoparticles on polymer film solar absorber, composed of poly(3-hexylthiophene): phyenyl-C61-butyric acid methyl ester (P3HT:PC61BM), was investigated...
Article
Nickel oxide (NiO) nano-particles assisted photons harvesting is studied using P3HT:PCBM blend based bulk heterojunction thin film organic solar cell (TFOSC). A comparison between devices that were fabricated at different concentration of NiO and that of the pristine P3HT:PCBM active layer were drawn up. The experimental results suggest that the in...
Article
The photoactive film morphology of ternary molecules blend bulk heterojunction organic solar cell was investigated using various solvent additives. Two donor polymers namely poly(3-hexylthiophene) (P3HT) and thieno[3,4-b]thiophene/benzodithiophene (PTB7) at (1:1) stoichiometric ratio were employed together with (PC 61BM) fullerene molecule in the p...
Article
Full-text available
Enhanced photocurrent was observed by embedding Cd doped Ba (NO3)2 nanoparticle composite in the photoactive layer of bulk heterojunction organic solar cell. The research was conducted based on P3HT: PCBM blend active layer containing Cd doped Ba (NO3)2 at various concentrations. The best performance of the fabricated devices was found to be depend...
Article
In this paper we have designed a plasmonic modulator based on metal-dielectric-metal waveguide in directional coupler structure with modulation depth of 19.44 dB, loss of -2.55 dB, figure of merit of 7.62 and size of 2.5 µm at telecommunication wavelength. Elasto-optic material is used as a dielectric in the main waveguide, whereas Vanadium Oxide i...
Article
Metal nano-particles (NPs) have been successfully synthesized by the reduction of [email protected]2O with the aid of surfactant PVP and excessive reducer ascorbic acid in ambient conditions. The composition and structures of the NPs were characterized by scanning and tunnelling microscopies (SEM and TEM). The synthesized nano-particles were employ...
Article
Environmentally stable and uniform silver:zinc bimetallic nano-composites (BNCs) was synthesized by co-reduction of silver:zinc ions from silver and zinc nitrates. The synthesized nano-composites were employed at the various layers of the device structure in the preparation of thin film peroveskite solar cell. Experimental evidences suggest that th...
Article
Conjugated polymers have been widely used as hole transport materials (HTM) in the preparation of mesoscopic perovskite solar cells (PSCs). In this work, we employed p-type doped conducting polymer known as poly(9,9-dioctylfluorene-co-bis-N,N-(-4-butyl phenyl)-bis-N,N-phenyl-1,4-phenylenediamine) (PFB) as a hole transport material (HTM) in perovski...
Article
Full-text available
Research on CdSe/ZnS core-shell quantum dots (QDs) was synthesized by a chemical route using bio-conjugated organic amino acid (L-Cysteine). The structural, morphological, and optical properties of the nanocrystal powder samples were analyzed using various characterization techniques. The diameter of the resulting QDs was about 3 nm with uniform si...
Article
The development of multifunctional materials, specially nanocomposites, exhibit new and interesting properties which can extend the applicability ranges to diverse fields. In this way, the use of tri metallic nanoparticles, and derives, demonstrated higher efficacy for purification, catalytic activities and as antibacterial agents. This work is con...
Article
Photovoltaics is a portentous alternative to the nonrenewable energy resources. Organic solar cells (OSCs) offer several advantages over inorganic counterparts in terms of low-cost device production, simple solution-based processing, flexibility, light-weight and compatibility with roll-to-roll fabrication. This review comprehensively examines the...
Article
Bimetallic nanoparticles (BNPs) are formed by the combination of two different metals. Bimetallic nanoparticles have attracted huge attention as compared to monometallic nanoparticles in both technological and scientific view because BNPs shows better properties. Bimetallic nanoparticles can be synthesized in different shape, size and structure. Th...
Article
Copper sulphide nano-particles (CuS) was successfully synthesized and incorporated in the thin film organic solar cell (TFOSC). The photo-active film is composed of poly (3-hexylthiophene) (P3HT) and (phenyl-C61-butyric acid methyl)(PC61BM) blend. The synthesized nano-particles (CuS) were characterized using high-resolution scanning and tunnelling...
Article
The effect of local surface plasmon resonance (LSPR) of a metal nano-composites in polymer solar absorber was investigated with the view to improve the performance of thin film organic solar cell (TFOSC). The nanoparticles are expected to improve photons harvesting by way of enhanced solar absorption and improved exciton dissociations. In this stud...
Article
Full-text available
Bulk heterojunction (BHJ) organic solar cells were fabricated using a trimetallic nanocomposite (Ag:Zn:Ni) in the photoactive layer. The incorporation of the nanocomposite was limited to the concentrations of 4% and 6% by volume into poly(3-hexylthiophene) (P3HT) and 6-6-phenyl-C 61 -butyric acid methyl ester (PCBM) blend solar absorber. The newly...
Article
Full-text available
In this paper, we reported the synthesis of high-quality ZnO-doped SWCNT (ZnO:SWCNT) nanostructures by perfume spray pyrolysis on copper substrate. The synthesized ZnO:SWCNT nanoparticle explored for the optoelectronic properties and its potential application in photonic devices. In this investigation, the ZnO:SWCNT was blended with the solar absor...
Chapter
Globally, intensive research and innovation has been carried out for development and designing of photocatalysts with high efficiency and cost-effectiveness for various environmental and energy applications. Photocatalysis has been focused among various advanced oxidation processes for environmental detoxification and energy production via water sp...
Article
Effective technologies and materials are needed for environmental detoxification and clean energy production. The actual photocatalytic technology is largely dependent on metal oxide-based semiconductors, which have issues such as cost, limited spectral response and recombination problems. Alternatively, non-metal photocatalysts have recently emerg...
Article
A low energy bandgap between Ce³⁺ and Ce⁴⁺ states in cerium oxides, high oxygen mobility and high oxygen storage capacity are the properties that qualify them to be the most widely used heterogeneous catalysts. This present work is an account of studies that were carried out on the synthesis and catalytic properties of pure CeO2, CeO2/La2O3 based b...
Article
Naturally occurring polymers are currently of prime importance among which polysaccharides occupies superior position due to their easy availability, eco- friendly and non-toxic nature. Guar gum, one of the naturally occurring polymer, is a galactomannan acquired by ground endosperm of Cyamopsis tetragonolobus or Cyamopsis psoraloides. It belongs t...
Article
Full-text available
This study presents the successful synthesis of a novel nanocomposite, namely a germanium quantum dot/nitrogen-doped graphene nanocomposite (GeQD/NGr), and its use in the modification of the photoactive medium of bulk heterojunction solar cells (BHJ-SCs). The nanocomposite was prepared in two sequential steps. Firstly, a reduced graphene oxide-germ...
Article
Cerium (IV) oxide (CeO2) is the most accessible noble rare earth metal oxide for the excitation of the excitons by light-harvesting performance. The present work is focused on Erbium doped ceria nanoparticles that were beneficially obtained by hydrothermal method from cerium nitrate and Erbium nitrate as precursors for decomposition of Rhodamine-B...
Article
Full-text available
Reduced graphene oxide–germanium quantum dots (rGO–Ge QDs) nanocomposite has been successfully employed in modifying poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the hole transport layer (HTL) in the preparation of a P3HT:PCBM-based polymer solar cell (PSC). The effect of the surface morphology and the optical transmittanc...
Article
Full-text available
Nanoparticles of tin oxide (SnO2) powders were prepared by co-precipitation method at 500 °C, 700 °C and 900 °C temperature. The sintered SnO2 nanoparticles, structural, optical, magnetic, morphological properties and microbial activity have been studied. XRD studies reveals that sintered powder which exhibits tetragonal crystal structure and both...
Chapter
Full-text available
Organic and inorganic nanocomposites have been successfully used in the preparation of thin film organic solar cells with the view either to enhance the harvesting of solar energy or to assist in the charge transport processes. The optical absorption, conductivity and environmental stability of the nanocomposite are the main criteria that determine...
Article
Full-text available
Perovskite based solar cells have recently emerged as one of the possible solutions in the photovoltaic industry for availing cheap solution processable solar cells. Hybrid perovskites display special combination of low bulk-trapdensities, ambipolar charge transport properties, good broadband absorption properties and long charge carrier diffusion...