Mitigating the Efficiency Deficit in Single-Crystal Perovskite Solar Cells by Precise Control of the Growth Processes
Tongpeng Zhao, Ruiqin He, Tanghao Liu, Yanhao Li, De Yu, Yuxin Gao, Geyang Qu, Ning Li, Chunmei Wang, Huang Huang, Jiong Zhou, Sai Bai, Shumin Xiao, Zhaolai Chen, Yimu Chen, Qinghai Song
Abstract
The power conversion efficiencies (PCEs) of polycrystalline perovskite solar cells (PC–PSCs) have now reached a plateau after a decade of rapid development, leaving a distinct gap from their Shockley-Queisser limit. To continuously mitigate the PCE deficit, nonradiative carrier losses resulting from defects should be further optimized. Single-crystal perovskites are considered an ideal platform to study the efficiency limit of perovskite solar cells due to their intrinsically low defect density, as demonstrated in bulk single crystals. However, current single-crystal perovskite solar cells (SC-PSCs) based on single-crystal thin film (SCTF) suffer from severe nonradiative carrier losses at the interface and in the bulk simultaneously due to the immature SCTF growth techniques. In this study, we show that the SC-PSCs can outperform state-of-the-art PC–PSCs, with MAPbI 3 as an example, by suppressing carrier losses at the interface and in the bulk in device-compatible SCTFs through precisely controlling their growth.