Sun Junlu, Hua Qilin, Zhou Ranran, Li Dongmei, Guo Wenxi, Li Xiaoyi, Hu Guofeng, Shan Chongxin, Meng Qingbo, Dong Lin, Pan Caofeng, Wang Zhong Lin
Beijing Institute of Nanoenergy and Nanosystems , Chinese Academy of Sciences , Beijing 100083 , P.R. China.
College of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , P.R. China.
ACS Nano. 2019 Apr 23;13(4):4507-4513. doi: 10.1021/acsnano.9b00125. Epub 2019 Mar 25.
Tremendous work has been made recently to improve the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs); the best reported value is now over 23%. However, further improving the PCEs of PSCs is challenged by material properties, device stability, and packaging technologies. Here, we report a new approach to increase the PCEs of flexible PSCs via introducing the piezo-phototronic effect in the PSCs by growing an array of ZnO nanowires on flexible plastic substrates, which act as the electron-transport layer for PSCs. From the piezo-phototronic effect, the absolute PCE was improved from 9.3 to 12.8% for flexible perovskite solar cells under a static mechanical strain of 1.88%, with a ∼40% enhancement but no change in the components of materials and device structure. A corresponding working model was proposed to elucidate the strategy to boost the performance of the PSCs. These findings present a general approach to improve PCEs of flexible PSCs without changing their fundamental materials.
最近在提高钙钛矿太阳能电池（PSC）的功率转换效率（PCE）方面取得了巨大进展；目前报道的最佳值已超过23%。然而，PSC的PCE进一步提高受到材料性能、器件稳定性和封装技术的挑战。在此，我们报告了一种通过在柔性塑料基板上生长ZnO纳米线阵列引入压电光电效应来提高柔性PSC的PCE的新方法，该ZnO纳米线阵列充当PSC的电子传输层。基于压电光电效应，在1.88%的静态机械应变下，柔性钙钛矿太阳能电池的绝对PCE从9.3%提高到了12.8%，提高了约40%，且材料和器件结构的组成没有变化。提出了一个相应的工作模型来阐明提高PSC性能的策略。这些发现提出了一种在不改变柔性PSC基本材料的情况下提高其PCE的通用方法。
