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Higha??Efficiency Lowa??Temperaturea??Processed Mesoscopic Perovskite Solar Cells from SnO <sub/>2</sub> Nanorod Selfa??Assembled Microspheres
摘要： Mesoporous scaffolds in perovskite solar cells (PSCs) can accelerate the formation of heterogeneous nucleation sites, leading to enhanced quality of perovskite films and uniform perovskite coverage over large areas. Nevertheless, the mesoporous electron transport layers (ETLs) can effectively compensate for the drawback of shorter electron diffusion lengths than their hole counterparts. Therefore, most mesoscopic PSCs usually show superior photovoltaic performance to their planar counterparts. However, mesoporous ETLs, particularly those prepared with metal oxide nanocrystals, often require a high-temperature sintering process for the removal of residual organics and the improved crystallization of metal oxides. Here, a novel emulsion-based bottom-up self-assembly strategy is used to prepare sizable SnO2 microspheres from oleic acid capped SnO2 nanorods. Combined with an in-situ ligand-stripping strategy, the low-temperature solution-processed mesoscopic PSCs can achieve efficiency as high as 21.35% with slight hysteresis and good reproducibility. In particular, the emulsion-based bottom-up self-assembly strategy is a general way for preparing microspheres from several kinds of semiconductor nanocrystals, so it will greatly expand the material selection range for preparing efficient mesoscopic PSCs and even inverted mesoscopic devices.
关键词： mesoscopic perovskite solar cells,in situ ligand stripping,low-temperature process,SnO2 nanorod self-assembled microspheres
更新于2025-09-16 10:30:52
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Effect of Ag/rGO on the Optical Properties of Plasmon-Modified SnO2 Composite and Its Application in Self-Powered UV Photodetector
摘要： A facile hydrothermal method was employed to synthesize silver–reduced graphene oxide (Ag/rGO) plasmon-modi?ed SnO2 composite, by incorporating Ag–reduced graphene oxide (Ag/rGO) into SnO2 nanorods as a photoanode for assembling a self-powered ultraviolet photodetector (UVPD). The as-synthesized samples were investigated in detail by X-ray di?raction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and UV visible spectrophotometer. The as-prepared Ag/rGO ?lms show enhanced light absorption attributed to the localized surface plasmon resonance (LSPR). The optimized 1.0 wt.% Ag/rGO incorporated into SnO2-based UVPD exhibits a signi?cant photocurrent response due to the enhanced absorption light and e?ective suppression of charge recombination. This UVPD demonstrates a high performance, with photocurrent density reaching 0.29 mAcm?2. This device also exhibits a high on:o? ratio of 195 and fast response time, which are superior to that of the free-modi?ed one. In addition, the UVPD based on plasmon-modi?ed SnO2 photoanode treated with TiCl4-aqueous solution has attained a higher photocurrent with a maximum value reaching 5.4 mAcm?2, making this device favorable in ultraviolet detection.
关键词： plasmon-modi?ed-SnO2 composite,Ag/rGO,UV photodetector,SnO2 nanorod,surface plasmon
更新于2025-09-12 10:27:22