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Novel photo-voltaic device based on Bi1?xLaxFeO3 perovskite films with higher efficiency
摘要： Photovoltaic cells using polycrystalline La substituted bismuth iron oxide, Bi1?xLaxFeO3, (0.1 ≤ x ≤ 0.4), films as the light harvesting component were investigated in this work. A novel cell set-up utilizing a double layered TiO2 film as top contact and a thin layer of quasi-solid polymer electrolyte as back contact was used and a significant enhancement in cell efficiency was observed for assemblies based on x ≥ 0.2 samples, coincident with a structural transition of Bi1?xLaxFeO3 from ferroelectric to non-ferroelectric. The power conversion efficiency of the PV device was 0.13% for the cell with x = 0.2 at 1 sun irradiation. The short circuit current density for this La composition was 0.35 mA cm?2. A hysteretic behaviour was observed for higher La compositions when the scanning is from open-circuit (OP) to short-circuit (SC) which may be attributed to polarization effects. The results at x ≥ 0.2 show an improved performance with respect to BiFeO3 based systems, suggesting the stabilization of the non-ferroelectric crystal structure leads either to a more efficient separation of photo-generated electron–hole pairs and/or enhanced charge transport. The findings represent a step towards the realisation of facile to fabricate, inorganic solid state photovoltaic devices.
关键词： ferroelectric,Photovoltaic cells,power conversion efficiency,quasi-solid polymer electrolyte,Bi1?xLaxFeO3,non-ferroelectric,TiO2
更新于2025-09-10 09:29:36
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Numerical simulation of carrier transporting layer free planar perovskite cells
摘要： One of challenging issues in research on planar perovskite solar cells (PSCs) is to design a device structure as simple as possible with high device performance, being beneficial to decreasing process complexity, improving device stability and reducing fabrication cost. In this work, concerning two categories of configurations, p-CH3NH3PbI3 based hole transporting layer (HTL) free planar PSCs, as well as p-CH3NH3PbI3 based HTL- free and electron transporting layer (ETL) free planar PSCs were modeled and simulated by AFORS-HET software, and the performances of these PSCs were analyzed in detail. Several factors or parameters that influence the performance of PSCs were concerned in the models, such as interface defect layer, trap density of the perovskite layer, series resistance and shunt resistance. The yielded power conversion efficiency (PCE) of HTL-free PSCs with the configurations of ZnO:Al/ZnO/CH3NH3PbI3 and ZnO:Al/TiO2/CH3NH3PbI3 were 14.36% and 16.92%, respectively. Three transparent conductive oxide (TCO) materials, i.e. ZnO:Al, FTO and ITO, were directly combined with p-type CH3NH3PbI3 to form ZnO:Al/CH3NH3PbI3, FTO/CH3NH3PbI3 and ITO/CH3NH3PbI3 carrier transporting layer free PSCs, with the PCE up to 15.91%, 15.48% and 6.42%, respectively. This evaluation indicates the high performances of some both HTL-free and ETL-free, carrier transporting layer free, planar PSCs with TCO/perovskite heterojunctions, an extremely simple device structure. This could be because photo-generated carriers can be effectively separated by built-in electric field and transported from p-n heterojunctions to electrodes in TCO/CH3NH3PbI3 heterojunction solar cells.
关键词： Planar perovskite solar cells,HTL-free,Power conversion efficiency,TCO/ETL/CH3NH3PbI3,TCO/CH3NH3PbI3,ETL-free
更新于2025-09-10 09:29:36
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Tandems in the thick of it
摘要： Two-terminal all-perovskite tandem structures are promising as low-cost yet highly efficient solar cells, but their development is limited by the poor quality of the low bandgap absorber layer. Now, a processing method has been shown to enable the production of uniform, thick tin–lead perovskite layers, which translate into improved photovoltaic parameters.
关键词： perovskite photovoltaics,low bandgap absorber,power conversion efficiency,tin–lead perovskite,tandem solar cells
更新于2025-09-09 09:28:46
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Dimensionality engineering of hybrid halide perovskite light absorbers
摘要： Hybrid halide perovskite solar cells were first demonstrated in 2009 with cell efficiency quickly soaring from below 10% to more than 23% in a few years. Halide perovskites have the desirable processing simplicity but are very fragile when exposed to water and heat. This fragility represents a great challenge for the achievement of their full practical potential in photovoltaic technologies. To address this problem, here we review the recent development of the mixed-dimensional perovskites, whereby the trade-off between power conversion efficiency and stability of the material can be finely tuned using organic amine cations with different sizes and functionalities.
关键词： hybrid halide perovskite,organic amine cations,stability,mixed-dimensional perovskites,solar cells,power conversion efficiency
更新于2025-09-09 09:28:46