Vertical 2D/3D Heterojunction of Tin Perovskites for Highly Efficient HTM-Free Perovskite Solar Cell
Jin-Tai Lin, Tzu-Chi Chu, Deng‐Gao Chen, Zhi‐Xuan Huang, Hsiao‐Chien Chen, Hsiao‐Chien Chen, Chia‐Shuo Li, Chih‐I Wu, Pi‐Tai Chou, Ching‐Wen Chiu, Hao Ming Chen, Hao Ming Chen
Abstract
Tin perovskite solar cells (PSCs) have been attracting attention in photovoltaic application, while the performance of Sn PSCs, especially for hole-transporting materials (HTMs)-free configuration, is relatively poor because of short mean-free-path for photogenerated charge carriers. We report a p–n junction with spatially appropriate architecture and energetic alignment in perovskite light-absorbing layer, resulting in an excellent performance of HTM-free Sn PSCs with a power conversion efficiency (PCE) of 5.17%, the highest value reported in HTM-free Sn PSCs. The p–n junction configuration plays a key role in achieving high efficiency and realizing excellent stability for more than 200 h operation.