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oe1(光电查) - 科学论文

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  • Single-Source Vapor-Deposited Cs2AgBiBr6 Thin Films for Lead-Free Perovskite Solar Cells

    摘要： Lead-free double perovskites have been considered as a potential environmentally friendly photovoltaic material for substituting the hybrid lead halide perovskites due to their high stability and nontoxicity. Here, lead-free double perovskite Cs2AgBiBr6 films are initially fabricated by single-source evaporation deposition under high vacuum condition. X-ray diffraction and scanning electron microscopy characterization show that the high crystallinity, flat, and pinhole-free double perovskite Cs2AgBiBr6 films were obtained after post-annealing at 300°C for 15 min. By changing the annealing temperature, annealing time, and film thickness, perovskite Cs2AgBiBr6 solar cells with planar heterojunction structure of FTO/TiO2/Cs2AgBiBr6/Spiro-OMeTAD/Ag achieve an encouraging power conversion efficiency of 0.70%. Our preliminary work opens a feasible approach for preparing high-quality double perovskite Cs2AgBiBr6 films wielding considerable potential for photovoltaic application.

    关键词： perovskite solar cell,lead-free,thin film,single-source vapor deposition

    更新于2025-09-12 10:27:22

  • Perovskite Quantum Dots Exhibiting Strong Hole Extraction Capability for Efficient Inorganic Thin Film Solar Cells

    摘要： Inorganic semiconductor Sb2(S,Se)3 possesses a suitable bandgap, environmentally benign elemental composition, and excellent stability, offering ample promise for next-generation low-cost solar cells. Here, we demonstrate that perovskite quantum dots (QDs), including CH3NH3PbBr3 and CsPbBr3, can serve as highly efficient and air-stable hole extraction materials in Sb2(S,Se)3 solar cells. Through a proper pre-treatment of the colloidal QDs, a 25-nm-thick QD film can be obtained with excellent uniformity and charge transport properties. Spectroscopic and photoelectrochemical analysis show that perovskite QDs can effectively extract holes from Sb2(S,Se)3 with suppressed carrier recombination. The perovskite QDs/Sb2(S,Se)3 heterojunction also establishes an increased built-in potential so that open-circuit voltage is pronouncedly enhanced. Finally, the device based on perovskite QDs/Sb2(S,Se)3 heterojunction boosts the efficiency from 4.43% to 7.82%, setting a record value, to the best of our knowledge, in Sb2(S,Se)3 solar cells. Our research manifests another application of perovskite materials and practical strategy toward efficiency improvement of Sb2(S,Se)3 solar cells.

    关键词： efficiency improvement,inorganic thin film solar cells,Perovskite quantum dots,Sb2(S,Se)3,hole extraction

    更新于2025-09-12 10:27:22

  • Wide‐Bandgap Perovskite/Gallium Arsenide Tandem Solar Cells

    摘要： Gallium arsenide (GaAs) photovoltaic (PV) cells have been widely investigated due to their merits such as thin-film feasibility, flexibility, and high efficiency. To further increase their performance, a wider bandgap PV structure such as indium gallium phosphide (InGaP) has been integrated in two-terminal (2T) tandem configuration. However, it increases the overall fabrication cost, complicated tunnel-junction diode connecting subcells are inevitable, and materials are limited by lattice matching. Here, high-efficiency and stable wide-bandgap perovskite PVs having comparable bandgap to InGaP (1.8–1.9 eV) are developed, which can be stable low-cost add-on layers to further enhance the performance of GaAs PVs as tandem configurations by showing an efficiency improvement from 21.68% to 24.27% (2T configuration) and 25.19% (4T configuration). This approach is also feasible for thin-film GaAs PV, essential to reduce its fabrication cost for commercialization, with performance increasing from 21.85% to 24.32% and superior flexibility (1000 times bending) in a tandem configuration. Additionally, potential routes to over 30% stable perovskite/GaAs tandems, comparable to InGaP/GaAs with lower cost, are considered. This work can be an initial step to reach the objective of improving the usability of GaAs PV technology with enhanced performance for applications for which lightness and flexibility are crucial, without a significant additional cost increase.

    关键词： gallium arsenide,phase segregation,perovskite/GaAs tandem cells,thin-film flexible tandem cells,wide-bandgap perovskites

    更新于2025-09-12 10:27:22

  • Highly Transparent and Surface-Plasmon-Enhanced Visible-Photodetector Based on Zinc Oxide Thin-Film Transistors with Heterojunction Structure

    摘要： Highly transparent zinc oxide (ZnO)-based thin-film transistors (TFTs) with gold nanoparticles (AuNPs) capable of detecting visible light were fabricated through spray pyrolysis on a fluorine-doped tin oxide substrate. The spray-deposited channel layer of ZnO had a thickness of approximately 15 nm, and the thickness exhibited a linear increase with an increasing number of sprays. Furthermore, the ZnO thin-film exhibited a markedly smoother channel layer with a significantly lower surface roughness of 1.84 nm when the substrate was 20 cm from the spray nozzle compared with when it was 10 cm away. Finally, a ZnO and Au-NP heterojunction nanohybrid structure using plasmonic energy detection as an electrical signal, constitutes an ideal combination for a visible-light photodetector. The ZnO-based TFTs convert localized surface plasmon energy into an electrical signal, thereby extending the wide band-gap of materials used for photodetectors to achieve visible-light wavelength detection. The photo-transistors demonstrate an elevated on-current with an increase of the AuNP density in the concentration of 1.26, 12.6, and 126 pM and reach values of 3.75, 5.18, and 9.79 × 10?7 A with applied gate and drain voltages. Moreover, the threshold voltage (Vth) also drifts to negative values as the AuNP density increases.

    关键词： gold-nanoparticles,phototransistors,plasmonic energy detection,spray pyrolysis,zinc oxide-based thin-film transistors

    更新于2025-09-12 10:27:22

  • Modeling Thin Film Solar Cells: From Organic to Perovskite

    摘要： Device model simulation is one of the primary tools for modeling thin film solar cells from organic materials to organic–inorganic perovskite materials. By directly connecting the current density–voltage (J–V) curves to the underlying device physics, it is helpful in revealing the working mechanism of the heatedly discussed organic–inorganic hybrid perovskite solar cells. Some distinctive optoelectronic features need more phenomenological models and accurate simulations. Herein, the application of the device model method in the simulation of organic and organic–inorganic perovskite solar cells is reviewed. To this end, the ways of the device model are elucidated by discussing the metal–insulator–metal picture and the equations describing the physics. Next, the simulations on J–V curves of organic solar cells are given in the presence of the space charge, interface, charge injection, traps, or exciton. In the perovskite section, the effects of trap states, direct band recombination, surface recombination, and ion migration on the device performance are systematically discussed from the perspective of the device model simulation. Suggestions for designing perovskite devices with better performance are also given.

    关键词： perovskites,device models,thin film solar cells,organic semiconductors

    更新于2025-09-12 10:27:22

  • Thin water film assisted glass ablation with a picosecond laser

    摘要： Ultrashort lasers have become a promising tool for fast and high quality cutting of glasses. However, growing industry constantly seek for higher production throughput maintaining excellent process quality. In most cases, glass processing speed is limited to avoid clogging the laser-ablated channel, minimize crack generation, and heat accumulation effects in the glass material. Studies have shown that the introduced water layer onto the surface of the workpiece can significantly improve laser throughput and processing quality. This paper investigates laser ablation of soda-lime glass sheets in ambient air and water-assisted conditions. Glass cutting and single scan groove ablation were investigated in spite of ablation efficiency and scribe morphology. A 532 nm laser working at 100 kHz repetition rate was utilized in the experiments. Results showed that the applied thin flowing water film on the sample’s surface improved the glass ablation efficiency by 12 times.

    关键词： thin-film,cutting,glass,water,Laser

    更新于2025-09-12 10:27:22

  • Limit of Incorporating Cesium Cations into Formamidinium-Methylammonium Based Mixed Halide Perovskite Solar Cells

    摘要： Cesium (Cs) makes perovskite robust in terms of thermodynamic stability as well. We explore the means of incorporating Cs into a base perovskite of mixed cation (FA/MA) and mixed halide (I/Br) that has a proven track record of high performance through inter-diffusion approach. With this approach, it has been shown that perovskites form a smooth film without any residual PbI2 and exhibit higher absorbance. Though the residual PbI2 disappeared with the increase in added Cs, the film morphology became rough for Cs concentration higher than 15%. Addition of small amounts of PbCl2 allowed inclusion of more Cs content, which resulted in smooth film surface and further improved device performance.

    关键词： mixed-cations,Cs-incorporation,thin-film solar cells,inter-diffusion,two-step process,Perovskite

    更新于2025-09-12 10:27:22

  • Titanium dioxide-based picoseconds pulsed fiber laser performances comparison in the 1.5-micron region

    摘要： We demonstrated and compared picoseconds pulsed fiber lasers based on Titanium dioxide based saturable absorbers (SAs); 20 cm long Titanium dioxide-doped fiber (TiO2DF) and Titanium dioxide PVA film (TiO2PF) in the 1.5-micron region. The laser cavity utilized 2.4 m long Erbium-doped fiber (EDF) as the gain medium. A self-starting pulsed laser with a consistent repetition rate of ~1 MHz emerged stably with the incorporation of TiO2 based SAs. The TiO2DF SA produced 9.74 ps pulsed laser at a central wavelength of 1553 nm within a pump power range of 106-142 mW. The fiber SA promoted slightly higher slope efficiency and maximum pulse energy of 13.17% and 8.56 nJ, respectively in comparison with the film SA. On the other hand, the TiO2PF SA generated stable 3.89 ps pulsed laser at an operating wavelength of 1560 nm within 86-142 mW pump power range. The film SA also produced slightly greater maximum output power of 12.17 mW and maximum peak power of 3.43 kW, respectively at the maximum pump power. The results confirmed that both TiO2 SAs can be good alternative pulse modulator in the 1.5-micron region.

    关键词： Titanium dioxide,fiber saturable absorber,Optical fiber laser,thin film

    更新于2025-09-12 10:27:22

  • Interfacial Engineering in Functional Materials for Dye‐Sensitized Solar Cells || Nanoarchitectures as Photoanodes

    摘要： Photovoltaic (PV) devices are the proficient way to obtain electrical energy from solar energy to meet the ever-increasing global energy demand. Silicon (Si)-based PV cells have reached an efficiency of 24.7% though at the cost of sophisticated technologies and expensive techniques [1], hampering low-cost production and limiting their widespread utilization [2]. Some of the drawbacks of the Si-PV devices were overcome by second-generation thin-film PV devices that are lightweight, flexible, and low-cost but are less efficient. The thin-film PV devices suffer from complex deposition process, difficulty in controlling stoichiometry and the presence of structural defects that adversely affects their performance [3]. The third-generation PV technology including organic photovoltaics (OPVs), dye-sensitized solar cells (DSSCs), quantum-dot dye-sensitized solar cells (QD-DSSCs), and perovskite solar cells have fulfilled the condition of low-cost simple fabrication process, and the research focuses is on enhancing the efficiency, performance, and stability [2]. OPVs possess low efficiency but consist of toxic materials, while perovskite solar cells suffer from moisture instability and poor reproducibility. DSSCs offer a lot of advantages such as excellent stability, low toxicity, good conversion efficiency [4], simple device design, and low-cost fabrication process that supports large-scale production [2]. Even though the highest certified conversion efficiency of DSSCs (11–13%) [4] is half of the advanced thin film or crystalline (26.4%, 27.6%, respectively), their unique functionalities make them attractive for research [5].

    关键词： Dye-sensitized solar cells,Photovoltaic devices,Quantum-dot dye-sensitized solar cells,Silicon-based PV cells,Thin-film PV devices,Low-cost fabrication,Conversion efficiency,Perovskite solar cells

    更新于2025-09-12 10:27:22

  • p-type Cu3BiS3 thin films for solar cell absorber layer via one stage thermal evaporation

    摘要： Ternary copper sulphides, especially copper-bismuth-sulphide (Cu-Bi-S), are alternative solar absorber materials due to their earth-abundant and non-toxic constituent elements, compared to the conventional copper indium gallium sulphide and cadmium telluride films. In this study, Cu-Bi-S thin films were deposited onto soda lime glass substrates using a one stage co-evaporation process from Cu2S and Bi2S3 sources, with the deposition temperatures varied from room temperature to 400°C. X-ray diffraction analysis confirmed that Cu3BiS3 was the dominant phase in the Cu-rich films, and the crystalline quality of the films was significantly improved with increasing the deposition temperature. An optical bandgap of 1.4 eV was achieved for the film deposited at 400°C, which demonstrated a Hall mobility of 3.95 cm2/V-s and a carrier concentration of 7.48 × 1016 cm-3. Cu3BiS3 films deposited at 375 and 400°C were implemented into superstrate solar cell structures (glass/ITO/n-CdS/p-Cu3BiS3/Al).

    关键词： p-Cu3BiS3,optical band gap,thermal co-evaporation,thin film solar cell,absorber layer

    更新于2025-09-12 10:27:22