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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Optimal synthesis of antimony-doped cuprous oxides for photoelectrochemical applications

    摘要： We investigated the influence of Sb dopant concentration on the structural, electrical, and photoelectrochemical properties of the photocathode cuprous oxide (Cu2O) thin films. The photoabsorber p-type Cu2O films were prepared by electrodeposition in ionic electrolytes including copper sulfate and antimony sulfate at 333 K and pH=10. The small amount of Sb doping contributes to the fast Cu ion transport to the substrate and ion consumption; consequently, the p-type Cu2O with high crystalline quality can be reproducibly synthesized with high electrical stability. Among the various samples, the mole fraction of c(Sb)/[c(Cu)+c(Sb)] = 0.75 mol % exhibits the best electrical resistivity and improved transparency in the infrared region, which is involved with the fast overlap of the nuclei crystals under 5 nm from the high nuclei density. Additionally, the post-thermal annealed Sb-doped Cu2O sample reveals an enhanced photocurrent of ~0.65 mA/cm2 vs. RHE (reversible hydrogen electrode) without metal catalysts.

    关键词： Preferred orientation,Post annealing,Antimony doping,Photoelectrochemical cell,Cuprous oxide

    更新于2025-09-23 15:23:52

  • Effects of Withdrawal Speeds on Properties of ZnO Thin Films Prepared by Sol-Gel Immerse Technique

    摘要： ZnO thin films have attractive applications in photoelectric device, due to their excellent chemical, electrical and optical properties. In this paper, ZnO thin films with good c-axis preferred orientation and high transmittance are prepared on glass sheets by sol-gel immerse technique. The effects of withdrawal speeds on the growth process of thin film crystal, film crystal orientation and the crystallinity, the optical performance were investigated by XRD, SEM and UV-Vis spectrophotometry. The results show that the thin films were composed of better hexagonal wurtzite crystals with the c-axis prepared orientation. The transmittance of prepared thin films is over 80% in the visible-near IR region from 600 nm - 800 nm. ZnO films have sharp and narrow diffraction peaks, which indicates that the materials exhibit high crystallinity. With the withdrawal speeds increasing, the grain size of ZnO thin films and the intensity for all diffraction peaks were increased gradually. The growth model is changed from the stratified structure into the island structure in the growth process. The transmittance of the thin films decrease in the visible wavelength region, with the withdrawal speeds increasing.

    关键词： Withdrawal speeds,ZnO thin film,C-axis preferred orientation,Sol-gel technique

    更新于2025-09-23 15:23:52

  • Effect of hydrogen peroxide on photoelectric properties of high-transmittance FTO films prepared by spray pyrolysis

    摘要： The FTO film prepared by spray pyrolysis has low efficiency and most of the precursors are discharged in the form of waste steam. According to the high oxidation property of H2O2, it is attempted to improve the film formation rate by changing the concentration of H2O2. Fluorine-doped SnO2 (FTO) thin films with high transmittance were prepared by spray pyrolysis using monobutyltin trichloride as the tin source and ammonium fluoride as the fluorine source. Different concentrations of hydrogen peroxide (0-0.08M) are added to the precursor solution. In this paper, we studied the effect of hydrogen peroxide on the structure, surface morphology and photoelectric properties of FTO thin films. The results show that the growth rate of the FTO films increased from 6.04 nm/s to 8.36 nm/s with the increase of H2O2 concentration from 0 to 0.08 M. The optimum preparation process is H2O2 concentration controlled at 0.04M, and FTO thin films suitable for solar cells are prepared. It has excellent performance parameters; carrier concentration:2.74*1021cm-3; carrier mobility:55.92 cm2 V-1s-1; photoelectric quality factor:2.66×10-3·Ω-1and the average transmittance of visible light: 79.87%. At the same time, increasing H2O2 concentration leads to narrowing of optical band gap. Adding appropriate hydrogen peroxide concentration can improve the film production rate and obtain excellent quality films.

    关键词： Tin oxide,Preferred orientation,Hydrogen Peroxide,Optoelectronic performance

    更新于2025-09-23 15:22:29

  • CsPbBr3 quantum dots assisted crystallization of solution-processed perovskite films with preferential orientation for high performance perovskite solar cells

    摘要： The performance of hybrid perovskite solar cells (PSCs) is significantly influenced by the crystallization and morphology of perovskite films. Herein, a novel method of CsPbBr3 quantum dots (QDs) assisted nucleation is applied to prepare high quality solution-processed methylammonium lead iodide (MAPbI3) films by employing CsPbBr3 QDs as an additive into diethyl ether anti-solvent. The appropriate amount of CsPbBr3 QDs can act as effective heterogeneous nucleation centers, leading to the formation of smooth and pinhole-free perovskite films with increased grain size. Furthermore, the growth direction of MAPbI3 grains is regulated by CsPbBr3 QDs, exhibiting preferential orientation of (110) plane. Therefore, the MAPbI3 films with CsPbBr3 QDs modification show reduced defects and increased carrier lifetime. As a result, the champion PSC with a maximum power conversion efficiency (PCE) up to 20.17% is achieved and 85% of its initial PCE is maintained after aging 1000 hours at room temperature under a relative humidity of 50%. This work demonstrates a feasible way to prepare high quality perovskite films for optoelectronic applications.

    关键词： preferred orientation,heterogeneous nucleation centers,perovskite solar cells,CsPbBr3 QDs

    更新于2025-09-12 10:27:22

  • Efficient Copper‐Doped Antimony Sulfide Thin‐Film Solar Cells via Coevaporation Method

    摘要： Sb2S3 being a light-absorbing material is used for photovoltaic (PV) application due to its superior stability and progressive power conversion efficiency (PCE) benefiting from its low cost, less toxic, earth-abundant, and facile nature. Due to the difficulty in efficient doping for such 1D structure, the performance of as-fabricated thin-film solar cells is limited by high resistivity and hole extraction barrier. Herein, a coevaporation scheme is introduced for copper-doped Sb2S3 by rapid thermal evaporation (RTE). The Cu-doped Sb2S3 thin film discloses the enhanced crystallinity with a grain diameter greater than 1 μm and conductivity along with improved carrier concentration. At the same time, the deep valance band obtains a minor upshift, favoring the hole extraction at back contact. Consequently, all the PV parameters are enhanced leading to the PCE boosting from 4.18% to 4.61%. Herein, a facile doping technique is demonstrated to improve its performance without any modification of the present RTE method.

    关键词： efficient doping,antimony sulfide,preferred orientation,contact barrier,solar cells

    更新于2025-09-11 14:15:04

  • Fabrication of (111)-Oriented Nanotwinned Au Films for Au-to-Au Direct Bonding

    摘要： We reported that highly (111)-oriented nanotwinned gold can be fabricated by periodical-reverse electroplating. The as-deposited films are shown to have a strong (111) preferred orientation, increasing with the reverse current time. The ratios of I(111)/I(220) and I(111)/I(200) in X-ray diffraction signals indicates a strong (111) preferred orientation. Using the advantage of the fast surface diffusion of (111) plane compared to the other planes of gold, we performed direct bonding with different thicknesses. Grain growth was observed over two films’ interfaces to eliminate the bonding interface, when annealed at 250 ?C for 1 h. Shear tests were performed to gain insight on the bonding quality. All the chips failed at either the silicon substrate or substrate-adhesion layer, showing possible higher strength than the tested maximum, 40.8 MPa.

    关键词： bonding,electrodeposition,nanotwin,gold,preferred orientation

    更新于2025-09-04 15:30:14