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A systematic approach to ZnO nanoparticle-assisted electron transport bilayer for high efficiency and stable perovskite solar cells
摘要： Minimizing the interface loss of perovskite solar cells is critical to achieving high photovoltaic performance, and intensive research is underway on interfacial engineering in this regard. In this work, we introduce a ZnO nanoparticles (ZnO NPs) interlayer between phenyl-C61-butyric acid methyl ester (PCBM) and a metal electrode in order to reduce the interface loss due to charge recombination and device degradation, and also investigate the dependence of device performance on the thickness and morphology of the PCBM and PCBM/ZnO electron transport bilayer. After achieving optimized PCBM and ZnO thickness, the PCBM/ZnO bilayer-based devices reached an average power conversion efficiency of 15.63% (Max. 16.39%) with an open circuit voltage of 1.05 V, short circuit current density of 18.69 mA cm-2, and fill factor of 79.95%. In addition, hysteresis behavior and atmospheric stability are significantly improved by the incorporation of a PCBM/ZnO bilayer. Therefore, the implementation of a PCBM/ZnO electron transport bilayer is a promising approach toward achieving a high-efficiency PSC with stable power output (low J-V hysteresis) and durability.
关键词： ZnO nanoparticles,interfacial engineering,stable perovskite solar cells,interface loss,high-efficiency perovskite solar cells,electron transport bilayer
更新于2025-11-19 16:46:39
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Bilateral Interface Engineering for Efficient and Stable Perovskite Solar Cells using Phenylethylammonium Iodide
摘要： Achieving high efficiency and long-term device stability is a vital issue for the commercialization of organic-inorganic hybrid perovskite solar cells (PeSCs). In this work, phenyl ethyl-ammonium iodide (PEAI)-induced bilateral interface engineering was developed to improve the device efficiency and stability of methylammonium lead triiodide (MAPbI3)-based PeSCs. Introducing PEAI onto poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) layer modifies the surface properties of the PEDOT:PSS and facilitates the formation of a high-quality perovskite active layer with enlarged grains on the PEDOT:PSS. The PEA+ in the PEAI-PEDOT:PSS also alters the work function of the PEDOT:PSS, leading to a reduction in the energy difference between the PEDOT:PSS and MAPbI3 perovskite layer, which decreases energy loss during charge transfer. Additionally, depositing PEAI onto three dimensional (3D) perovskite yields a two dimensional/three dimensional (2D/3D) stacked structure for the perovskite active layer. Because the two dimensional (2D) top layer acts as a capping layer to prevent water penetration, the stability of the perovskite active layer is significantly enhanced. A PeSC device fabricated based on this combination exhibits enhanced power conversion efficiency and extended device lifetime compared to a pristine PeSC. Under high-humidity conditions (75 ± 5%), the PEAI-treated PeSC retains 88% of its initial power conversion efficiency (PCE) after 100 h. In contrast, a pristine PeSC device loses over 99% of its initial PCE after only 25 h under the same conditions.
关键词： high efficiency,perovskite solar cells,bilateral interface engineering,PEAI,long-term stability
更新于2025-09-23 15:21:01
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Dealing with Climate Parameters in the Fabrication of Perovskite Solar Cells under Ambient Conditions
摘要： Although perovskite solar cells have demonstrated impressive efficiencies in research laboratories (above 25%), there is a need for experimental procedures to fabricate solar cells under ambient conditions to substantially decrease manufacturing costs. Nevertheless, to achieve efficient and highly stable devices in these conditions, the moisture level in the atmosphere must be monitored. The relative humidity (RH) has classically been the parameter of choice; however, in this work we show that the parameter of relevance is the absolute content of water measured in the form of partial water vapour pressure (WVP). To highlight the importance of this parameter, we demonstrate that small changes in ambient temperature at the same RH result in huge changes in solar cell performance. This is due to the non-linear dependence of the WVP on temperature (according to the Clausius-Clapeyron equation), and explains the dispersion of results found in the literature for devices nominally made at the same ambient RH levels. To illustrate this critical effect, we have deposited MAPbI3 perovskite films at different WVP values, which were derived from the climate parameters, RH and laboratory temperature, present during fabrication (not controlled). Hence, we adapt the fabrication method to the ambient conditions by monitoring the WVP, which allows for the fabrication of MAPbI3 based devices with efficiencies of up to 18.2% outside the glove box. In fact, we have extended the procedure to accomplish high-efficiency FA0.83MA0.17PbI3 devices under ambient conditions by adjusting the DMSO proportion in the perovskite precursor solution to the WVP.
关键词： Water Vapor Pressure,High Efficiency,Perovskite solar cells,Clausius-Clapeyron equation,Ambient Conditions
更新于2025-09-23 15:19:57
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Highly efficient mixed-halide mixed-cation perovskite solar cells based on rGO-TiO2 composite nanofibers
摘要： In this investigation, the electrospun reduced graphene oxide-titanium oxide composite nanofibers as an electron transporting materials have been employed for the perovskite solar cells. The synthesized electron transporting materials have been used for the fabrication of mixed-cation lead mixed-halide (FAPbI3)0.85(MAPbBr3)0.15 perovskite solar cells. The influence of reduced graphene oxide on titanium oxide nanofibers and their morphological and electronic properties have been investigated in detail. The optimized device having FTO/Bl-TiO2/rGO4–TiO2/(FAPbI3)0.85(MAPbBr3)0.15/spiro-MeOTAD/Au configuration exhibited 17.66 % power conversion efficiency with an open circuit voltage of 1.070 V, short circuit current density of 22.16 mAcm-2 and fill factor of 0.754. This obtained efficiency is much higher than that of mesoporous- titanium oxide (14.39 %), pristine- titanium oxide nanofibers (15.82 %) and other reduced graphene oxide- titanium oxide composite nanofibers based electron transporting materials.
关键词： electron transporting materials,large grain size,high-efficiency,Perovskite solar cells,role of rGO in TiO2 nanofibers
更新于2025-09-19 17:13:59