Ultrastable and efficient slight-interlayer-displacement 2D Dion-Jacobson perovskite solar cells
Weichuan Zhang, Ziyuan Liu, Lizhi Zhang, Hui Wang, Chuanxiu Jiang, Xianxin Wu, Chuanyun Li, Shengli Yue, Rongsheng Yang, Hong Zhang, Jianqi Zhang, Xinfeng Liu, Yuan Zhang, Huiqiong Zhou
Abstract
Abstract Stability has been a long-standing concern for solution-processed perovskite photovoltaics and their practical applications. However, stable perovskite materials for photovoltaic remain insufficient to date. Here we demonstrate a series of ultrastable Dion−Jacobson (DJ) perovskites (1,4-cyclohexanedimethanammonium)(methylammonium) n −1 Pb n I 3 n +1 ( n ≥ 1) for photovoltaic applications. The scalable technology by blade-coated solar cells for the designed DJ perovskites (nominal n = 5) achieves a maximum stabilized power conversion efficiency (PCE) of 19.11% under an environmental atmosphere. Un-encapsulated cells by blade-coated technology retain 92% of their initial efficiencies for over 4000 hours under ~90% relative humidity (RH) aging conditions. More importantly, these cells also exhibit remarkable thermal (85 °C) and operational stability, which shows negligible efficiency loss after exceeding 5000-hour heat treatment or after operation at maximum power point (MPP) exceeding 6000 hours at 45 °C under a 100 mW cm −2 continuous light illumination.