基于双钙钛矿的透明光伏器件

Transparent Photovoltaics Based on Double Perovskites

摘要:

透明光伏器件可以对太阳光谱中不同成分进行选择性吸收,从而在维持器件透明性的条件下产生光伏效应。已有大量研究报道将多晶硅及钙钛矿材料用于透明光伏器件以实现多功能物联网集成系统。然而,传统多晶硅和钙钛矿材料的窄带隙特性使得所制备的透明光伏器件无法达到最高的透明度,从而无法满足对外观的需求,也难以进行多功能系统集成。针对于此,本工作将非铅双钙钛矿Cs2AgBiBr6引入作为透明太阳能电池的光吸收层,实现了紫外吸收的透明光伏器件。在器件制备过程中通过引入低压后处理步骤成功制备出高质量、低雾度以及高透过率的Cs2AgBiBr6多晶薄膜,然后进行对器件参数的系统优化,制备得到的透明光伏器件的光电转换效率PCE达到1.56%, 同时平均可见透过率达到73%。

Abstract:

Transparent photovoltaic devices can selectively absorb different components in the solar spectrum so as to produce photovoltaic effect while maintaining the overall transparency of the device. Plenty of work has been reported to use perovskites to transparent photovoltaic (TPV) devices to obtain multifunctional systems. However, the narrow bandgap and sharp absorption edge of the typical polycrystalline silicon and perovskites prevent them from achieving the highest transparency to satisfy the requirements of aesthetic and integration. Herein, double perovskites with a wide bandgap and indirect bandgap characteristics is introduced to fabricate long-term stable transparent photovoltaic devices, In the process of device preparation, we first successfully prepared Cs2AgBiBr6 polycrystalline thin film with high quality, low foggy and high transparency by introducing low-pressure post-processing steps, and then systematically optimized the device parameters. The fully optimized devices exhibit a power conversion efficiency (PCE) of 1.56% and the average visible transmittance (AVT) of 73%.