- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Black phosphorus quantum dots in inorganic perovskite thin films for efficient photovoltaic application
摘要： Black phosphorus quantum dots (BPQDs) are proposed as effective seed-like sites to modulate the nucleation and growth of CsPbI2Br perovskite crystalline thin layers, allowing an enhanced crystallization and remarkable morphological improvement. We reveal that the lone-pair electrons of BPQDs can induce strong binding between molecules of the CsPbI2Br precursor solution and phosphorus atoms stemming from the concomitant reduction in coulombic repulsion. The four-phase transition during the annealing process yields an α-phase CsPbI2Br stabilized by BPQDs. The BPQDS/CsPbI2Br core-shell structure concomitantly reinforces a stable CsPbI2Br crystallite and suppresses the oxidation of BPQDs. Consequently, a power conversion efficiency of 15.47% can be achieved for 0.7 wt % BPQDs embedded in CsPbI2Br film-based devices, with an enhanced cell stability, under ambient conditions. Our finding is a decisive step in the exploration of crystallization and phase stability that can lead to the realization of efficient and stable inorganic perovskite solar cells.
关键词： inorganic perovskite,phase stability,Black phosphorus quantum dots,photovoltaic application,crystallization
更新于2025-09-19 17:13:59
-
Copper doping of Sb2S3: fabrication, properties, and photovoltaic application
摘要： Sb2S3 solar cells are lagging behind conventional thin-film solar cells such as silicon solar cells and cadmium telluride solar cells in the power conversion efficiency (PCE). One of the most prominent problems is that the carrier concentration of Sb2S3 is relatively low. In order to increase the carrier concentration, elemental Cu was doped into Sb2S3 film by radio-frequency (RF) magnetron sputtering. We proved that Cu was doped into Sb2S3 films and mainly anchored with sulfur in the form of copper chalcogenide species at the surface and grain boundaries of Sb2S3. The doping of Cu essentially affects the physical and electrical properties of RF-sputtered Sb2S3 films such as the optical band gap, crystallinity, chemical composition, morphology, and carrier concentration. Specially, the electronic carrier concentration is remarkably increased from 6.28 × 109 to 6.06 × 1010 cm?3 and the Fermi level is also significantly uplifted after prudent doping with Cu. Planar solar cells based on RF-sputtered Cu-doped Sb2S3 absorber deliver an increased PCE of 1.13% and show good stability. This research proves that doping of Cu is an alternative and effective way to improve the electronic property of Sb2S3 films and enhance the performance of Sb2S3 solar cells.
关键词： RF magnetron sputtering,Cu-doping,photovoltaic application,carrier concentration,Sb2S3 solar cells
更新于2025-09-16 10:30:52
-
A photovoltaic stand-alone lighting system with polymeric-silica-gel-electrolyte-based substrate-integrated lead-carbon hybrid ultracapacitors
摘要： Harnessing solar electricity generated through photovoltaic cells with lead-acid batteries remains the most compelling option at present. But lead-acid batteries have encountered problems in photovoltaic installations, mainly due to their premature failure. To circumvent the aforesaid problem, a new technology referred to as substrate-integrated lead-carbon hybrid ultracapacitor with polymeric-silica-gel electrolyte, is developed in-house and tested for solar-electricity storage for a lighting application. The high-throughput performance tests for the device are conducted at laboratory scale and compatibility of the device for photovoltaic application is evaluated. In doing so, the device is installed with a photovoltaic panel for field test and data are collected from August 2012 through July 2013. The year round field-test data analyzed in the light of the available global-horizontal-irradiance data show attractive performance for the device. It is noteworthy that, unlike lead-acid batteries, seasonal variations in solar radiance exhibit little effect on the performance of the device.
关键词： Polymeric silica gel electrolyte,Cycle-life,Photovoltaic application,Substrate-integrated lead-carbon hybrid ultracapacitor,Field testing
更新于2025-09-16 10:30:52
-
Tailoring optical transmittance of polyvinyl alcohol by FeCl3-doping for photovoltaic application
摘要： In this paper, solid ?lms of polyvinyl alcohol (PVA) complexed with di?erent concentration of FeCl3 have been successfully synthesized. X-ray di?raction showed that a drop in the crystallinity of PVA with FeCl3. UV-Vis spectra show that FeCl3 remarkably enhances UV absorption of PVA, indicating a reduction of optical band gap (OBG). This led to the assumption that increased UV absorption can be assigned to an in?uence of FeCl3 on PVA synthesis. In addition, OBG study shows decrements in the values of direct band gap and indirect band gap with FeCl3 content. These results led to conclude that FeCl3 doped PVA ?lms are good candidates in the packaging community and photovoltaic application.
关键词： photovoltaic application,optical transmittance,polyvinyl alcohol,FeCl3
更新于2025-09-16 10:30:52
-
A computational approach to study the optoelectronic properties of F-BODIPY derivatives at the bulk level for photovoltaic applications
摘要： The Dipyrrin compounds are recognized as imminent and hi-tech organic semiconductor materials (OSMs) designed for photovoltaic applications owing to low-cost, flexible, and eco-friendly nature. In a latest study, several optoelectronic properties of conjugated F-BODIPY derivatives were studied by using the density functional theory (DFT) at (GGA/PBE) level. This analysis classifies Comp_1 (5,5-difluoro-1,37,9-tetramethyloctahydro-1H,5H-5l4-dipyrrolo[1,2-c:2',1'-f][1,3,2]diazaborinine) as a direct band-gap semiconductor with a band-gap of 2.81 eV. The band-gap of Comp_2 (2-ethyl-5,5-difluoro-1,3,7,9-tetramethyloctahydro-1H,5H-5l4-dipyrrolo[1,2-c:2',1'-f][1,3,2]diazaborinine) and Comp_3 (2,8-diethyl-5,5-difluoro-1,3,7,9-tetramethyloctahydro-1H,5H-5l4-dipyrrolo[1,2-c:2',1'-f] [1,3,2] diazaborinine) are reduced by 1.25 and 1.09 eV, respectively in comparison with parent molecule Comp_1 owing to the influence of p- orbitals of all atoms in crystal structures. The reduction in energy and density of states (DOS) for these compounds in this study validated that band-gap could be improved to a required value for optoelectronic applications by derivatives modeling. Additionally, optoelectronic properties at the solid-state bulk level were also computed. Several features of interest at solid-state bulk level exposed the F-BODIPY derivatives as competent compounds for organic semiconductor devices applications.
关键词： Bandgap,Bulk level,Photovoltaic application,F-BODIPYs,Organic semiconductor
更新于2025-09-12 10:27:22
-
Physical properties of cerium doped-yttrium iron garnet ultrathin films for photovoltaic application
摘要： In this study, cerium incorporated yttrium iron garnet ultrathin films (CexY3-xFe5O12) (where x = 0, 0.1, 0.3, and 0.5) were prepared by the sol-gel method, spin coating technique, and heat treatment on quartz substrates. The effect of Ce on structural properties, morphology of thin films surface, and optical properties was explored by X-ray diffraction (XRD), field emission microscopy (FESEM), and atomic force microscopy (AFM). According to the XRD results, the films were crystalline with the cubic phase, while the FESEM indicated the YIG nanoparticles with approximately spherical shapes. The growth process of crystallite in YIG nanoparticles was investigated by X-ray peak broadening. The Williamson-Hall (W–H) analysis was utilized to maintain the contributions of crystallite size on the peak broadening of Ce:YIG nanoparticles. The structural features of thin films such as strain and stress for all of the peaks of XRD were accurately determined from the uniform deformation model (UDM) according to the YIG cubic phase. According to the AFM pictures, it seemed that thin films had a continuous and smooth surface. The absorption and transmission were measured in the visible and infrared region from 400 to 1200 nm.
关键词： Structural features,Cerium yttrium iron garnet thin films,Photovoltaic application,Optical properties,Sol-gel
更新于2025-09-12 10:27:22