Jinquan Wei

• Doctor of Philosophy
• Professor (Associate) at Tsinghua University

It is a big challenge to prepare thick CsPbCl3 films using the traditional solution process approaches owing to the low solubility of precursors of PbCl2 and CsCl in common solvents. Here, we propose an indirect solution process to prepare thick CsPbCl3 films. In this new approach, a mother film of CsPbBr3 is firstly prepared through a solution pro...

Fabrication of highly efficient perovskite solar cells (PSCs) under open air conditions is highly desired for their commercialization. However, it is still a huge challenge to prepare highly efficient PSCs in open air conditions because the perovskite films are highly sensitive to moisture. Additionally, the solvents used for the preparation of per...

High quality perovskite films with large grains, preferential orientation, and low defect density are desired for efficient perovskite solar cells. Here, we fabricate all- inorganic CsPbBr3 perovskite films from thermal vapor deposition followed by upside -down high temperature annealing. After high temperature annealing, the perovskite films with...

Screening green solvent to prepare the function layers in perovskite solar cells (PSCs) has important significance for the safety of manufacturers and the environment in the upcoming large-scale industrialization. The all green solvent engineering of perovskite films eliminates the toxicity from host solvent to anti-solvent. However, it still needs...

All inorganic perovskite of CsPbBr3 based perovskite solar cells (PSCs) have attracted increasingly attentions in the hot topics for research of PSCs owing to their high stability in air. Fabrication of columnar CsPbBr3 grains spanning the whole films is strongly desired for fabrication of highly efficient solar cells. Here, we introduce a polymer...

All-brominated cesium lead bromide (CsPbBr3) perovskite solar cells (PSCs) have drawn growing attention owing to unprecedented stability in the family of perovskites. It usually employs a two-step method to prepare CsPbBr3 films owing to the low solubility of CsBr in the common solvents. The researchers have to provide enough Cs source through incr...

An in-situ potassium (K)-doped copper–zinc–tin–sulfide (CZTS) precursor is prepared and annealed through selenization. After comprehensive optimization of the annealing, a cell with an efficiency of up to 12.62% is obtained,...

Ultrabroadband photodetectors (PDs) working in the frequency range from the UV to THz regions of the spectrum play a crucial role in integrated multifunction photoelectric detection. Even so, a shortage of high-performance PDs has seriously restricted the overall development of this field. The present work demonstrates a high-performance, ultrabroa...

CsPbBr3 perovskite solar cell (PSC) has triggered an increasing interest owing to its high tolerance to thermal and humidity in the open air. The one-step method is preferable for preparing high-quality CsPbBr3 films and thereby highly efficient PSCs. However, the poor solubility of CsBr in common solvents makes it a big challenge to prepare desire...

Photothermoelectric materials have important applications in many fields. Here, we joined a silver nanostructure film and a carbon nanotube film by van der Waals force to form a heterojunction, which shows excellent photothermal and photoelectric conversion properties. The local temperature difference and the output photovoltage increase rapidly wh...

Solvent engineering technology is an important approach for fabrication of high quality perovskite films, and thereby high-performance perovskite solar cells (PSCs). However, it is strongly dependent on the usage of toxic solvents, including the host solvent and anti-solvent to prepare perovskite solutions and control the crystalli-zation of perovs...

Carbon nanotube (CNT) films are promising materials for application in ultra-broadband photodetectors because their absorption range covers the entire spectrum from ultraviolet to the terahertz region, and their detection mechanism is the bolometric effect. Because of the different and limited photothermal conversion efficiencies of CNTs with respe...

Hot carriers play a significant role in applications of photovoltaics, photodetection, and photocatalysis. However, effective methods for observing the ultrafast dynamic processes of hot carriers are concentrated on the time domain, on which it is difficult and complex to operate. We propose a novel, to the best of our knowledge, and creative strat...

Photothermoelectric materials have important applications in many fields. Here, we joined a silver nanostructure film (AgNSF) and a carbon nanotube film (CNTF) by van der Waals force to form a AgNSF/CNTF heterojunction, which shows excellent photothermal and photoelectric conversion properties. The local temperature difference and the output photov...

The surface roughness of CIGS absorber and residual Cu–Se phase on the surface are two major factors greatly affecting the performance of CuInGaSe2 (CIGS) solar cells with the absorbers fabricated by the selenization annealing of Cu–In-Ga precursors. In this work, Br2–CH3OH solution is used to etch the surfaces of CIGS films to address these two ch...

The AgCuInGa alloy precursors with different Ag concentrations are fabricated by sputtering an Ag target and a CuInGa target. The precursors are selenized in the H2Se-containing atmosphere to prepare (Ag,Cu)(In,Ga)Se2 (ACIGS) absorbers. The beneficial effects of Ag doping are demonstrated and their mechanism is explained. It is found that Ag doping...

CsPbBr3 films have attractive applications in resistive switching memory, light-emitting diodes, photodetectors, and especially in perovskite solar cells (PSCs) because of their high stability and ease of fabrication in open air conditions. However, toxic solvents are usually employed to prepare CsPbBr3 films in these devices,which have potential t...

Toxic solvents used in the fabrication of perovskite films are a non-ignorable obstacle for the commercia-lization of perovskite solar cells (PSCs). CsPbBr3 based solar cells have attracted increasing attention due to their high stability in ambient air. Usually, a traditional sequential deposition route is employed to fabricate CsPbBr3 films, in w...

In this work, the effects of the non-deposition time during the sputtering process on the properties of CuInGaSSe (CIGSSe) absorbers and the quality of CIGSSe/CdS interface are investigated. It is found that the crystallinity of CuInGa precursor films can be reduced by shortening non-deposition time (tnd). Reducing the crystallinity of precursor fi...

Small droplets exist in nature widely and have attractive applications. Although there are some well-established techniques to produce small droplets, it is still a substantial challenge to generate and measure the volume of ultrafine droplets down to attolitres (aL) precisely. Here, we accurately generate ultrafine droplets in attolitre scale by a...

Perovskite structures of organic and inorganic halides are peculiar structures with many interesting properties. Using their photoelectric effect, the structures have been used in photocells, photoelectric sensors, and light-emitting diodes. In conventional perovskite film crystallization, which is a one-step method, the MAPbI3 crystals form disord...

All-carbon nanotube (CNT) hybrid films are fabricated through a facile vacuum filtration method by using hydrophilic single-walled carbon nanotube (SWCNT) films as filters and multi-walled carbon nanotube (MWCNT) powder dispersed in ethanol as liquor. The hydrophilic SWCNT film provides penetration channels for water, while the superhydrophobic MWC...

CZTSeS absorbers were prepared by two-step annealing under Ar carried H2Se gas, namely, annealing holding at 400°C then at 560°C. The additional holding results in a more compact morphology, same microstructure of phases and higher emission energy of CZTSeS absorbers. The FF as high as 79% has been achieved by improving R sh , together with the con...

CsPbBr3 based perovskite solar cells have attracted an increasing attention owing to their high stability in ambient. The conduction band o ffset (CBO) between electron transportation layer and light absorb layer hasimportant effects on the photovoltaic performance of perovskite solar cells. For the typical device configurationof FTO/TiO2/CsPbBr3/C...

Toxic solvent used in the fabrication of perovskite solar cells is an obstacle for their commercialization. Replacing those toxic solvents with the green solvents is very important for both ecological environment safety and operators’ health working in manufactory and labs. CsPbBr3 based solar cell has attracted increasing attention owing to its hi...

Eutectic gallium-indium (EGaIn) alloy is a kind of liquid metal and has attracted much attention due to good properties. In order to satisfy the trend of miniaturization and realize more practical applications, the exploration for preparation method and properties of EGaIn at nanoscale are very important. Here, facile vacuum thermal evaporation met...

Water has been labeled as a devil in fabrication and stability of perovskite solar cells. The inherent cognition impels researchers to prepare perovskite films in water-controlled conditions. Herein, water is used as a green solvent to prepare CsPbBr3 films through a two-step spin-coating method. Due to the high solubility of CsBr but low solubilit...

As an inevitable optoelectronic material with unique properties, halide perovskites attracted increasing attention in recent years. Meanwhile, hybridization of nanostructured perovskites with one-dimensional (1D) or two-dimensional (2D) functional materials has exhibited unique applications in nanotechnology. In this communication, a highly conduct...

Cu(In, Ga)Se2 (CIGS) solar cells were fabricated by selenizing Cu-In-Ga precursors obtained by sputtering a Cu-In-Ga ternary alloy target. A preheating process was introduced during the selenization process to optimize the interface between the absorption layer and the buffer layer to improve the device performance. The results showed that the qual...

CZTS precursors with different Cu concentration deposited by magnetron sputtering were annealed under H2Se and Ar hybrid atmosphere to obtain CZTSSe absorbers. A series of characterization techniques were carried out to investigate the influences of Cu concentration on phase structures and electrical properties of CZTSSe absorbers. Results showed t...

Cu2ZnSnS4 (CZTS) thin films were prepared by sulfurizing stacked precursors by sputtering from Cu-Zn and Cu-Sn targets which is promising for industry. The phases formation during sulfurization were investigated by varying sulfurization temperatures from 350 °C to 550 °C. At temperatures of 350 °C and 400 °C, only a thin layer ZnS formed on the sur...

Fast and sensitive detection of terahertz radiation is notoriously difficult, especially the detection at the ambient condition. Here, we fabricated bolometric terahertz photodetectors based on suspended carbon nanotube (CNT) fibers. Because the CNT fibers exhibit a very small heat dissipation area, the heat transport from the CNT fibers to the air...

Alkali metal doping is a promising method to enhance the performance of Cu2ZnSn(Se,S)4 (CZTSSe)solar cells due to its excellent effect on Cu(In,Ga)Se2 (CIGS)solar cells. In this work, rubidium (Rb)was doped in CZTSSe absorbers by sputtering Rb doped Cu2ZnSnS4 (CZTS)target with subsequent H2Se contained annealing. By this method, Na concentration in...

Ultrafine droplets play important roles in many fields. Here, we prepare ultrafine droplets with volumes in femtoliter scale by applying an electrostatic field between a needle and substrate. The diameter of liquid is reduced significantly to about 1/50 that of the needle tip. By using some solvents consisting of small molecules, ultrafine droplets...

In this paper, multi-layered composites are fabricated for their application in electromagnetic interference (EMI) shielding. Composites of multi-walled carbon nanotubes/manganese dioxide (MnO2)/epoxy are used as a microwave absorption layer, and a commercial carbon fiber cloth is used as a reflection layer. When the electromagnetic (EM) waves impi...

Copper Indium Gallium Selenide (Cu(In,Ga)Se2, CIGSe) absorbers with different Ga contents were prepared by sputtering CIGSe ceramic targets and post-annealing. CIGSe solar cell devices were fabricated with other functional layers. The device performances and absorber properties were investigated. Increasing Ga content led to an increase in VOC and...

High quality perovskite films with large columnar grains are greatly desired for efficient perovskite solar cells. Here, low volatility N-Methyl-2-pyrrolidone (NMP) was added in MAI/IPA solution in a two-step spin-coating method, which promoted the conversion of lead iodide to perovskite. The perovskite films were annealed by a closed-steam anneali...

The sequential processes of sputtering quaternary CIGSe ceramic targets and annealing in sulfur-containing atmosphere were applied to prepare Cu(In,Ga)(Se,S) 2 (CIGSeS) absorbers. Solar cell devices were fabricated with CIGSeS absorbers annealed in H 2 S-containing atmosphere with different H 2 S concentrations. Composition and microstructure of ab...

Recently, perovskite solar cells have attracted great attention due to their outstanding photovoltaic performance and ease of fabrication. High quality perovskite films hold a key in getting highly efficient perovskite solar cells. Solution-processed fabrication technique is the most widely adopted for preparing perovskite films owing to its low co...

Double-walled carbon nanotubes (DWCNTs) combined the advantages of multi-walled (MW-) and single-walled (SW-) CNTs can be obtained by transforming the precursors (e.g. fullerene, ferrocene) into thin inner CNTs inside SWCNTs as templates. However, this method is limited since the DWCNT yield is strongly influenced by the filling efficiency (dependi...

High quality perovskite films with large grains and long carrier lifetime are crucial for efficient solar cells. It is a simple and effective way to increase the perovskite grain size by adding some additives in the precursor solution. Here, we use a low toxic and low volatile organic compound of 1-ethyl-2-pyrrolidone (NEP) as an additive in the Pb...

Perovskite films are usually fabricated by solution-processed method due to its low cost and ease of fabrication. The organic solvent plays multiple roles in growth of perovskites. Here, we investigate the growth of methylammonium lead iodide perovskite and its intermediate phase from micro-droplets containing with various solvents. Perovskite inte...

CIGSeS (Cu(In,Ga)(Se,S)2, (CIGSeS)) absorbers were fabricated by sputtering a quaternary ceramic CIGSe targets and annealing in sulfur-containing atmosphere. Sulfurization was applied at various temperatures to study the variation of composition and microstructure. The performances of cells were also investigated. Sulfurization at high temperature...

Double-walled carbon nanotubes (DWCNTs) combined the advantages of multi-walled (MW-) and single-walled (SW-) CNTs can be obtained by transforming the precursors (e.g. fullerene, ferrocene) into thin inner CNTs inside SWCNTs as templates. However, this method is limited since the DWCNT yield is strongly influenced by the filling efficiency (dependi...

The low open circuit voltage (Voc) of Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells limits their efficiency. CZTSSe absorbers were fabricated by sputtering Cu2ZnSnS4 (CZTS) target and subsequent selenization treatment and then incorporated into solar cells. The influence of selenization temperature on the growth of the CZTSSe grains and device perf...

The CdS layers are vital for diode quality of cell devices, which have great influences on high-performance CZTSSe solar cells. Optimizing the deposition processes of CdS layers are necessary to improve the diode quality and device efficiency. In this work, CZTSSe solar cells were fabricated without and with pre-deposited CdS layers, which are refe...

Fabrication of wide band-gap (Eg) CuGaSe2 (CGSe) thin film solar cells with large area uniformity and good reproducibility is difficult, which is crucial for tandem cells. In this work, a method was proposed and investigated to overcome this problem. CGSe solar cells were fabricated by sputtering from a ternary CGSe target and post selenization tre...

The physical properties of organic–inorganic hybrid perovskite materials are greatly influenced by their composition, crystallinity, and morphology. Here, we investigate the growth of CH3NH3PbI3-xBrx perovskite from micro-droplets of methylammonium iodide/lead acetate/dimethylformamide precursor solution adding with different conentrations of PbBr2...

The properties of organic–inorganic hybrid perovskites depend on their compositions greatly. Here, we in situ investigate the crystallization of methylammonium lead halide (MAPbI3-xBrx) from micro-droplets by adjusting the molar ratio of iodine to bromine in precursor solution, which help to control the morphology, crystallinity and physical proper...

Compositional engineering of mixed halides is an effective approach to fabricate highly efficient perovskite solar cell. The mixed halide perovskite of MAPbI3-xClx attracts a great of attentions due to its excellent optoelectronic properties. However, the role of chlorine in MAPbI3-xClx is still under discussion by now. Here we introduce PbCl2 as a...

Pure kesterite Cu2ZnSnSe4 (CZTSe) absorbers with a large average grain size are vital for high-efficiency CZTSe solar cells, which are greatly influenced by the annealing atmosphere. Sputtered CZTSe precursors were annealed in the presence and absence of a selenium-containing atmosphere, and these materials were incorporated into solar cells. When...

Generally, residual solvent is embedded in perovskite precursor films fabricated from the Lewis adduct method. Most of research focus on the ligand function of the solvent in forming solvate complex for fabricating high quality perovskite films. But, few attentions are paid to the latent function of the solvent in the perovskite precursor films...

Perovskite solar cells (PSCs) have great potentials in photovoltaics due to their high power conversion efficiency and low processing cost. PSCs are usually fabricated from PbI2/dimethylformamide solution with some toxic additives, such as N-methyl pyrrolidone and hexamethylphosphoramide. Here, we use an environmental friendly aprotic polar solvent...

The solvent embedded in intermediate phase is widely observed in fabrication of perovskite films. The perovskite precursor films obtained from Lewis adducts through molecular exchange contain some residue solvent. It has an intrinsic solvent annealing effects during annealing process. Here, we pre-deposit a protective layer on the perovskite precur...

High quality perovskite films can be fabricated from Lewis acid-base adducts through molecule exchange. Substantial work is needed to fully understand the formation mechanism of the perovskite films, which help to further improve their quality. Here, we study the formation of CH3NH3PbI3 perovskite films by introducing some dimethylacetamide into Pb...

A size effect of more scattered strength with decreasing diameter is revealed by tension experiments on melt-spinning fabricated Pd77.5Cu6Si16.5 metallic glass microwires, and is explained from a perspective of structural inhomogeneity and a higher structure sensitivity of metallic glasses under tension condition and in a large aspect ratio. Such a...

Two-step method is widely used to fabricate high efficient perovskite solar cells. In the typical two-step method, CH3NH3PbI3 perovskite are fabricated from PbI2films through intercalation reaction between PbI2 and CH3NH3I, which usually have rough surface and residual PbI2 due to compact PbI2structure. Here, we introduce some strong Lewis bases in...

It is of great importance to investigate the crystallization of organometallic perovskite from solution for enhancing performance of perovskite solar cells. Here, this study develops a facile method for in situ observation of crystallization and growth of the methylammonium lead iodide (MAPbI3 ) perovskite from microdroplets ejected by an alternati...

High efficiency perovskite solar cells can be made through Lewis adduct approach. The interaction between PbI2 and Lewis base is a key factor to make high quality perovskite films. Here, we combine a two-step method with the Lewis adduct approach to fabricate high quality organometallic perovskite films by tuning the strength of Pb-O bond in the...

A broadband photodetector based on Au nanoparticle/double-walled carbon nanotube film/TiO2 nanotube array /Ti multilayer heterojunction structures has been fabricated. A pre-electroforming process at a voltage bias of 35 V was used to switch the photodetector from a high resistance state to a low resistance state. At a voltage bias of 1 V under 532...

Flexible strain sensors have promising applications in healthcare and human movement detection. Herein, we report stretchable and compressible strain sensors based on carbon nanotube meshes (CNTMs) with unique structures consisting of macroscopic grids and microscopic spider-web networks. The stretchable strain sensor shows good reliability for lon...

Lewis acid-base reaction between PbI2 and solvent molecule is popular in fabricating PbI2 films in the two-step method for making perovskite solar cells. Here, we controll the microstruture of PbI2 films through modulating the Lewis acid-base reaction by adding small amount of N-Methyl pyrrolidone into PbI2/DMF solution. PbI2 films with excellent c...

Perovskite solar cell has a puzzling phenomenon of current hysteresis. Here, we modulate the hysteresis by applying a poling voltage. Charge accumulations are detected in the perovskite solar cells. Two interacting capacitors are identified through dynamic voltage measurement. We elucidate that the current hysteresis origins mainly from the polariz...

We developed a new Pb-free Ag paste with a SnO[single bond]P2O5 glass frit for front contact electrodes of crystalline silicon solar cells. First, we synthesized SnO[single bond]P2O5 glass frits with various compositions, whose glass transition temperatures were 225–245 °C, by using a melt-quenching method. It was experimentally verified that the g...

We describe a facile method to fabricate high quality CH3NH3PbI3 films with smooth surface and without residual PbI2 through molecular exchange, rather than ionic intercalation. It forms a Lewis acid–base adduct of PbI2·xDMF when PbI2 precipitates from DMF solution. The lattice of PbI2 is expanded more than 30% due to the intercalation of DMF. With...

Currently studied carbon nanotube-silicon (CNT-Si) solar cells are based on relatively small active areas (typically <0.15 cm2); increasing the active area generally leads to reduced power conversion efficiencies. This study reports CNT-Si solar cells with active areas of more than 2 cm2 for single cells, yet still achieving cell efficiencies of ab...

Flexible fiber-shaped supercapacitors have great potential in wearable electronic devices. Here, we fabricate CNT-PPy composite films by an electrochemical deposition method from macroscopic CNT films. The composite films are transformed into flexible fibers with ultralow density by drawing through several diamond wire-drawing dies. The CNT-PPy fib...

Graphene aerogels are highly porous materials with many energy and environmental applications; tailoring the structure and composition of pore walls within the aerogel is the key to those applications. Here, by freeze casting the graphene oxide sheets, we directly fabricated freestanding porous graphene beads containing radially oriented through ch...

Nanocarbon-based photodevices show many interesting characteristics useful for solar cells production. The uses of carbon nanotubes and graphene for nanocarbon/silicon heterojunction solar cells are reviewed in this chapter. Nanocarbon serves multiple functions as transparent electrode, active junction layer, hole collector, and antireflection laye...

Fiber-shaped supercapacitors (FSSCs) have attractive applications in the flexible devices. Here, we report a high performance carbon nanotube (CNT) based fiber-shaped supercapacitor by adding two redox additives simultaneously: polypyrrole (PPy) to the electrodes and hydroquinone (HQ) to the electrolyte. A core-shell CNT-PPy nanocomposite fiber was...

Carbon nanotubes (CNTs) have great potential for use as electrical wires because of their outstanding electrical and mechanical properties. Here, we fabricate lightweightCNTfibers with electrical conductivity as high as that of stainless steel from macroscopic CNTfilms by drawing them through diamond wire-drawing dies. The entangledCNTbundles are s...

Nanocarbon structures such as carbon nanotubes (CNTs) and graphene (G) have been combined with crystalline silicon wafers to fabricate nanocarbon-Si solar cells. Here, we show that the contact between the nanocarbon and Si plays an important role in the solar cell performance. An asymmetrically configured CNT-G composite film was used to create eit...

The compact layer plays an important role in conducting electrons and blocking holes in perovskite solar cells (PSCs). Here, we use a two-dimensional titania nanosheet (TNS) thin film as the compact layer in CH3NH3PbI3 PSCs. TNS thin films with thicknesses ranging from 8 to 75 nm were prepared by an electrophoretic deposition method from a dilute T...

Large-area (e.g. centimeter size) graphene sheets are usually synthesized via pyrolysis of gaseous carbon precursors (e.g. methane) on metal substrates like Cu using chemical vapor deposition (CVD), but the presence of grain boundaries and the residual polymers during transfer deteriorates significantly the properties of the CVD graphene. If carbon...

We report on the characterization of a terahertz (THz) photodetector with an extremely simple structure consisting of only a macroscopic bundle of double-walled carbon nanotubes (DWCNTs) suspended between two metal electrodes. Polarization-sensitive, broadband, and significant photoresponse occurring at the DWCNT–metal contacts under THz illuminati...

Reduced graphene oxide (RGO)/Si Schottky diode has been fabricated by a simple drop-casting/annealing process. Common combustible and/or toxic gases including CH4, O2, CO, NO2, NO, and SO2 were employed to evaluate the detection performance of such device. The relationship between current response and gas flow rate, concentration, bias voltage as w...

We report the design and preparation of graphene and polyaniline (PANI) woven-fabric composite films by in-situ electropolymerization. The introduction of PANI greatly improves the electrochemical properties of solid-state supercapacitors which possess capacitances as high as 23 mF/cm^2, and exhibit excellent cycling stability with ~100% of capacit...

Carbon nanotube/graphene (CNT/G) composite sponge is prepared by in-situ partially unzipping of CNT sponge. Polypyrrole is then electro-polymerized onto the sponge to form CNT/graphene/polypyrrole (CNT/G/PPy) ternary composite sponge. The capacitive behavior of the composite is investigated by using cyclic voltammetry, galvanostatic charge/discharg...

By intercalating monolayer titania (TO) nanosheets into graphene oxide (GO) laminates with mild ultraviolet (UV) reduction, the as-prepared RGO/TO hybrid membranes exhibit excellent water desalination performances. Without external hydrostatic pressures, the ion permeations through the RGO/TO hybrid membranes can be reduced to <5% compared with the...

Carbon nanotube (CNT) is a promising candidate for flexible and wearable electronic applications. Here, we report a conductive, twistable and bendable CNT composite fiber with core-shell structure for efficient supercapacitor electrode, where the CNT bundles are coated with a thin layer of polypyrrole (PPy) (denoted as PPy@CNT). The electrochemical...

An efficient way to make new type of energy storage electrode is to combine different materials to make full use of their respective characteristics. A ternary supercapacitor electrode consisting of polyaniline, reduced graphene oxide (RGO) and carbon fibers (CFs) with high electrochemical performance is reported. A bundle of CFs is wrapped with RG...

Electrochemical anisotropic etching, along with prior cathodic polarization during anodic etching, is used to form homogeneous antireflective (AR) structures on metal surfaces. Further electrophoretic deposition forms graphene oxide (GO) nanostructures. The graphene-based AR coating is achieved by electrochemical reduction of GO. Optical metal surf...

All carbon coaxial supercapacitors based on hollow carbon nanotube (CNT) sleeve structure are assembled and tested. The key advantage of the structure is that the inner core electrode is variable from CNT sleeve sponges, to CNT fibers, reduced graphene oxide fibers, and graphene woven fabrics. By changing core electrodes from sleeve sponges to CNT...

Carbon nanotube (CNT) films are promising materials for constructing highly flexible composites for supercapacitor electrodes. Here, we prepared composite films with a sandwich structure and outstanding electrochemical properties by electrodepositing manganese oxide (MnOx) on the flexible CNT macrofilms. All-solid-state supercapacitors were then fa...

We report on the observation of the significant photocurrent response of a carbon nanotube (CNT) heterostructure device illuminated by continuous-wave terahertz (THz) radiation. The device consists of a double-walled CNT macrobundle contacted with two metallic nickel electrodes. A room-temperature current responsivity up to ∼0.3 mA/W was obtained w...

A hybrid heterojunction and solid-state photoelectrochemical solar cell based on graphene woven fabrics (GWFs) and silicon is designed and fabricated. The GWFs are transferred onto n-Si to form a Schottky junction with an embedded polyvinyl alcohol based solid electrolyte. In the hybrid solar cell, solid electrolyte serves three purposes simutaneou...