Improving UV stability of perovskite solar cells without sacrificing efficiency through light trapping regulated spectral modification  

光谱转换层调控钙钛矿太阳能电池紫外稳定性和效率

作　　者：Kaimo Deng Qinghua Chen Ying Shen Liang Li 邓楷模;陈清华;沈颖;李亮(School of Physical Science and Technology,Jiangsu Key Laboratory of Thin Films,Soochow University,Suzhou 215006,China)

机构地区：[1]School of Physical Science and Technology,Jiangsu Key Laboratory of Thin Films,Soochow University,Suzhou 215006,China

出　　处：《Science Bulletin》2021年第23期2362-2368,共7页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China (52025028, 51972218);the 1000 Youth Talents Plan;the 333 High-level Talents Cultivation Project of Jiangsu Province;the Six Talents Peak Project of Jiangsu Province;the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions。

摘　　要：The stability of perovskite solar cells is an important issue to be addressed for future applications.Perovskite solar cells are vulnerable to exposure to UV light due to promoted chemical reactions.However, preventing UV light from entering solar cells lowers the power conversion efficiency by reducing the photocurrent. The challenge is to improve UV stability without sacrificing efficiency. Here, we demonstrate the reduction of UV light-related negative effects from the perspective of spectral modification. By simultaneously introducing UV–visible downshifting and light trapping, perovskite solar cells can achieve a comparable efficiency of over 21% to that of an unmodified device. The optimized device obtains increased UV stability due to UV–visible downshifting. Different from other strategies, spectral modification externally alters the composition of incident light and improves UV stability without changing the internal device architecture, which is broadly applicable to perovskite solar cells with different structures. The present work may also find applications in other types of solar cells to boost the stability of devices exposed to UV light.太阳光中的紫外线能够在钙钛矿电池中激发光生载流子,对光电流形成有一定贡献,但高能量的紫外线对钙钛矿太阳能电池的稳定性有负面影响.完全过滤紫外线可以提高电池稳定性,但是会降低光电流和光电转换效率.如何平衡钙钛矿太阳能电池的紫外稳定性和光电转换效率是非常值得探索的问题.针对钙钛矿太阳能电池的光谱响应特点,我们提出在钙钛矿太阳能电池表面引入光谱转换层进行光谱调控,通过在光谱转换层中集成紫外-可见光光谱转换和陷光效应两种功能,一方面降低紫外线的负面作用,一方面提高可见光利用率,以期实现在不牺牲光电转换效率的同时提高电池的紫外稳定性.实验结果表明,钙钛矿太阳能电池在引入优化设计的光谱转换层后,转换效率不会降低,紫外稳定性明显提升.光谱转换层不需要对钙钛矿太阳能电池的内部结构做出任何修改,具有普遍适用性.

关 键 词：UV stability Perovskite solar cells Downshifting Light trapping 

分 类 号：TM914.4[电气工程—电力电子与电力传动]