Perovskitoid‐Templated Formation of a 1D@3D Perovskite Structure toward Highly Efficient and Stable Perovskite Solar Cells

• Published in: Advanced energy materials 2021-09, Vol.11 (34), p.n/a
• Main Authors: Kong, Tengfei, Xie, Haibing, Zhang, Yang, Song, Jing, Li, Yahong, Lim, Eng Liang, Hagfeldt, Anders, Bi, Dongqin
• Format: Article
• Language: English
• Subjects: 2‐diethylaminoethylchloride hydrochloride; additives; Carrier lifetime; Current carriers; Energy conversion efficiency; Illumination; Perovskite structure; Perovskites; perovskitoids; Photovoltaic cells; Solar cells; Surface layers; templates; Tensile strain
• ISSN: 1614-6832; 1614-6840
• DOI: 10.1002/aenm.202101018

Longevity is a long‐standing concern for organic–inorganic hybrid perovskite solar cells (PSCs). Recently, the use of low dimensional perovskite has been proven to be a promising strategy to improve the stability of PSCs. Herein, it is demonstrated that 1D perovskitoid based on 2‐diethylaminoethylchloride cations can act as a template to induce 1D@3D perovskite structure, leading to smoother surface texture, longer charge‐carrier lifetime, smaller residual tensile strain, and reduced surface‐defect density in the perovskite film. With this strategy, highly efficient and stable 1D@3D PSC with excellent reproducibility, showing a champion power conversion efficiency (PCE) of 22.9% under standard AM 1.5 G one sun illumination is realized. The unencapsulated optimized devices can retain 94.7%, 92.4%, and 90.0% of their initial PCEs for 2100, 2200, and 2200 h under ambient air, 85 °C and illumination conditions, respectively. It is demonstrated that 1D perovskitoid based on 2‐diethylaminoethylchloride cations can act as a template to induce 1D@3D perovskite structure, leading to smoother surface texture, longer charge‐carrier lifetime, smaller residual tensile strain, and reduced surface‐defect density in the perovskite film. With this strategy, highly efficient and stable 1D@3D PSCs with excellent reproducibility are realized.