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Integration of 3D Macroscopic Graphene Aerogel with 0D-2D AgVO3-g-C3N4 Heterojunction for Highly Efficient Photocatalytic Oxidation of Nitric Oxide
摘要： The application of three-dimensional (3D) aerogels for immobilizing powder catalysts can greatly enhance the catalyst cycling stability. In this study, we modify two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets with zero-dimensional (0D) silver metavanadate (AgVO3) quantum dots. The resulting 0D-2D heterojunction facilitates the separation of electron-hole pairs, and exhibits high efficiency for removing nitric oxide (NO) at low concentrations (600 ppb) at room temperature. The removal efficiency is much higher than that of pure g-C3N4. The porous network framework of the 3D AgVO3-g-C3N4-graphene hybrid aerogel is formed by bridging of graphene oxide sheets. This results in the heterojunction further enhancing electron-hole separation. The modification of g-C3N4 promotes the separation of photogenerated carriers in a step by step manner, and enhances their oxidation-reduction ability. The AgVO3-g-C3N4-graphene hybrid aerogel exhibits excellent catalytic activity for NO removal (maximum of 65%). Cycling experiments verify the stability and recyclability of the aerogel.
关键词： 0D-2D heterojunction,NO removal,visible light,3D aerogel
更新于2025-09-23 15:21:01
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Highly efficient white-LED-light-driven photocatalytic hydrogen production using highly crystalline ZnFe2O4/MoS2 nanocomposites
摘要： Designing efficient photocatalytic systems for hydrogen evolution is extremely important from the viewpoint of the energy crisis. Highly crystalline heterostructure catalysts have been established, considering their interface electric field effect and structural features, which can help improve their photocatalytic hydrogen-production activity. In this study, we fabricated a highly crystalline heterojunction consisting of ZnFe2O4 nanobricks anchored onto 2D molybdenum disulfide (MoS2) nanosheets (i.e., ZnFe2O4/MoS2) via a hydrothermal approach. The optimized ZnFe2O4/MoS2 photocatalyst, with a ZnFe2O4 content of 7.5 wt%, exhibited a high hydrogen-production rate of 142.1 mmol h?1 g?1, which was 10.3 times greater than that for the pristine ZnFe2O4 under identical conditions. The photoelectrochemical results revealed that the ZnFe2O4/MoS2 heterojunction considerably diminished the recombination of electrons and holes and promoted efficient charge transfer. Subsequently, the plausible Z-scheme mechanism for photocatalytic hydrogen production under white-LED light irradiation was discussed. Additionally, the influence of cocatalysts on the photocatalytic hydrogen evolution for the ZnFe2O4/MoS2 heterostructure was investigated. This work has demonstrated a simplified coupling of one-dimensional or zero-dimensional structures with 2D nanosheets for improving the photocatalytic hydrogen production activity as well as confirmed that MoS2 is a viable substitute for precious metal-free photocatalysis.
关键词： Photocatalytic hydrogen production,Layered materials,MoS2,Photocatalysts,Heterojunction
更新于2025-09-23 15:21:01
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Tackling Performance Challenges in Organic Photovoltaics: An Overview about Compatibilizers
摘要： Organic Photovoltaics (OPVs) based on Bulk Heterojunction (BHJ) blends are a mature technology. Having started their intensive development two decades ago, their low cost, processability and flexibility rapidly funneled the interest of the scientific community, searching for new solutions to expand solar photovoltaics market and promote sustainable development. However, their robust implementation is hampered by some issues, concerning the choice of the donor/acceptor materials, the device thermal/photo-stability, and, last but not least, their morphology. Indeed, the morphological profile of BHJs has a strong impact over charge generation, collection, and recombination processes; control over nano/microstructural morphology would be desirable, aiming at finely tuning the device performance and overcoming those previously mentioned critical issues. The employ of compatibilizers has emerged as a promising, economically sustainable, and widely applicable approach for the donor/acceptor interface (D/A-I) optimization. Thus, improvements in the global performance of the devices can be achieved without making use of more complex architectures. Even though several materials have been deeply documented and reported as effective compatibilizing agents, scientific reports are quite fragmentary. Here we would like to offer a panoramic overview of the literature on compatibilizers, focusing on the progression documented in the last decade.
关键词： mixing interfaces,additives,bulk heterojunction,morphology modulators,donor/acceptor interface,organic photovoltaics,compatibilizers
更新于2025-09-23 15:21:01
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Deposition and characterization of earth abundant <scp>CuZnS</scp> ternary thin films by vacuum spray pyrolysis and fabrication of <scp>pa??</scp> CZS/ <scp>na??AZO</scp> heterojunction solar cells
摘要： We report fabrication of solar cell device <ITO/AZO/i-ZnO/CZS/Al> with Copper Zinc Sulfide (CZS) thin films as absorber layer. CZS thin films prepared using chemical spray pyrolysis technique at a pressure of 10?3 mbar at different substrate temperatures. Structural, morphological, optical, compositional and electrical properties of as prepared films are investigated. Structural analysis shows crystalline nature with mixed phase containing CuS-ZnS binary composite. Atomic Force Microscopy analysis shows the average particle size of 88 nm. Value of work function obtained from ultraviolet photoelectron spectroscopy is 4.58 eV. The band gap of the as-prepared films varies from 1.62 to 2.06 eV. Hall effect measurement proves the p-type nature for all the deposited films. Samples deposited at 350°C shows carrier concentration of 1021 cm?3 and electrical conductivity of 526 S cm?1. Solar cell device structure of <ITO/AZO/i-ZnO/CZS/Al> has been fabricated using the CZS sample deposited at 350°C. The cell parameters obtained are Voc = 0.505 V, Isc = 4.97 mA/cm2, FF = 64.28% and η = 1.6 ± 0.05%.
关键词： solar cell,heterojunction,ternary compound,thin film,absorber layer,vacuum spray pyrolysis
更新于2025-09-23 15:21:01
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Damp-Heat-Stable, High-Efficiency, Industrial-Size Silicon Heterojunction Solar Cells
摘要： Silicon heterojunction (SHJ) solar cells hold the power conversion efficiency (PCE) record among crystalline solar cells. However, amorphous silicon is a typical high-entropy metastable material. Damp-heat aging experiments unveil that the amorphous/crystalline silicon interface is susceptible to moisture, which is potentially the biggest stumbling block for mass production. By capping SiNx and SiOx dielectrics, the absolute PCE degradation is predicted to be only (cid:1)0.6% after a 30-year installation. This demonstrates the SHJ solar cell is a highly promising candidate for next-generation photovoltaics.
关键词： High efficiency,Amorphous silicon,Mass production,Damp-heat stability,Silicon heterojunction solar cells
更新于2025-09-23 15:21:01
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An inverted BiI3/PCBM binary quasi-bulk heterojunction solar cell with a power conversion efficiency of 1.50%
摘要： The use of toxic Pb hinders the widespread applications of lead halide perovskite solar cells, sparking an upsurge effort to develop lead-free solar cells. This work reports a facile low-temperature solution processed bismuth triiodide (BiI3)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) binary quasi-bulk heterojunction (BQ-BH) solar cell. The BiI3 and PCBM layers are innovatively utilized as the electron donor and acceptor to form a BQ-BH that promotes the separation of the excitons. The effective separation of excitons at the BiI3/PCBM BQ-BH is experimentally confirmed by the Kelvin probe force microscopy. An optimized inverted BiI3/PCBM BQ-BH solar cell can achieve a champion power conversion efficiency of 1.50% with a record short-circuit current density of 8.76 mA cm-2. The findings of this work confirm that the separation of excitons can be effectively promoted by inducing a suitable electron donor/acceptor type of BQ-BH, providing a new means to enhance the performance of BiI3-based solar cells.
关键词： electron acceptor,quasi-bulk heterojunction,exciton separation,solar cells,BiI3
更新于2025-09-23 15:21:01
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Theoretical study of new conjugated compounds with a low bandgap for bulk heterojunction solar cells: DFT and TD-DFT study
摘要： Bulk heterojunction solar cells have attracted scientific and economic interest in recent years, and have just been one of the future photovoltaic technologies to produce energy at low cost. To study the electronic and geometric properties of a novel conjugated polymer called r-PTTDPP50, which is formed from a derivative of diketopyrrolopyrrole (DPP), thiophene conjugated side chain and 2, 5-bis (trimethylstannyl) thiophene, functional density theory (DFT) has been used with several methods such as B3LYP, PBEPBE, B3PW91 and mPW1PW91 and the basis set 6-31G (d, p),to obtain the most appropriate method. The absorption properties have been obtained by the CAM-B3LYP method. Then, the functional tests giving the closest result to the experimental ones will be used to propose other structure candidates for applications in the domain of organic electronics. This research has been used to conduct next syntheses to compounds more helpful as active materials in optoelectronic.
关键词： Bulk heterojunction,DFT,solar cells,diketopyrrolopyrrole (DPP),thiophene
更新于2025-09-23 15:21:01
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A MoS <sub/>2</sub> /PTCDA Hybrid Heterojunction Synapse with Efficient Photoelectric Dual Modulation and Versatility
摘要： Just as biological synapses provide basic functions for the nervous system, artificial synaptic devices serve as the fundamental building blocks of neuromorphic networks; thus, developing novel artificial synapses is essential for neuromorphic computing. By exploiting the band alignment between 2D inorganic and organic semiconductors, the first multi-functional synaptic transistor based on a molybdenum disulfide (MoS2)/perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) hybrid heterojunction, with remarkable short-term plasticity (STP) and long-term plasticity (LTP), is reported. Owing to the elaborate design of the energy band structure, both robust electrical and optical modulation are achieved through carriers transfer at the interface of the heterostructure, which is still a challenging task to this day. In electrical modulation, synaptic inhibition and excitation can be achieved simultaneously in the same device by gate voltage tuning. Notably, a minimum inhibition of 3% and maximum facilitation of 500% can be obtained by increasing the electrical number, and the response to different frequency signals indicates a dynamic filtering characteristic. It exhibits flexible tunability of both STP and LTP and synaptic weight changes of up to 60, far superior to previous work in optical modulation. The fully 2D MoS2/PTCDA hybrid heterojunction artificial synapse opens up a whole new path for the urgent need for neuromorphic computation devices.
关键词： hybrid heterojunction synapses,photoelectric dual modulation,2D materials
更新于2025-09-23 15:21:01
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n-ZnO/p-GaN heterojunction ultraviolet (UV) photo detectors with high responsivity and fast response time grown by chemical vapor deposition technique
摘要： High quality c-axis oriented n-type ZnO epitaxial films are grown on p-type c-GaN/sapphire templates using a chemical vapor deposition technique where metallic zinc is used as the Zn source. n-ZnO/p-GaN heterojunctions were thus formed and show rectifying behaviour with a turn-on voltage of ～2.4 V and a very low leakage current of 1 × 10?11 A. Study of the spectral distribution of the photo response properties of these heterostructures shows a maximum at a wavelength of 366 nm with a peak responsivity of ～0.4 mA/W at zero bias condition. The peak responsivity increases further with the applied forward bias and reaches ～191 mA/W at 1 V. The spectral profile shows a sharp reduction in responsivity for wavelengths larger than ≈400 nm, making these devices suitable for application in solar blind UV detection. These devices are also found to show a fast response with a rise/decay time of only a few milliseconds. The study also reveals that the photo-responsivity of these devices depends crucially on the microcrystalline quality of the ZnO layers.
关键词： UV detector,photoresponse,n-ZnO/p-GaN heterojunction,epitaxial films
更新于2025-09-23 15:21:01
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Scalable Compact Modeling of III-V DHBTs: Prospective Figures of Merit Toward Terahertz Operation
摘要： We investigate the bias, temperature, and frequency dependence of two III–V double heterojunction bipolar transistors technologies based on InGaAs/InP and GaAsSb/InP processes, using a HiCuM/L2 compact model-based multigeometry scalable parameter extraction methodology. Very good agreement between the model simulations and experimental data is demonstrated. Transistor currents and junction capacitances show very good scaling, thereby allowing the separation of intrinsic and peripheral effects. Prediction of future III–V HBT technologies figures-of-merit is performed by using the generated scalable model card.
关键词： InGaAs/InP DHBTs,heterojunction bipolar transistors,Compact model,GaAsSb/InP DHBTs
更新于2025-09-23 15:21:01