Chen Chun-Hao, Su Zhen-Huang, Lou Yan-Hui, Yu Yan-Jun, Wang Kai-Li, Liu Gen-Lin, Shi Yi-Ran, Chen Jing, Cao Jun-Jie, Zhang Liang, Gao Xing-Yu, Wang Zhao-Kui
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China.
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China.
Adv Mater. 2022 Apr;34(16):e2200320. doi: 10.1002/adma.202200320. Epub 2022 Mar 13.
Perovskite photovoltaics are strong potential candidates to drive low-power off-grid electronics for indoor applications. Compared with rigid devices, flexible perovskite devices can provide a more suitable surface for indoor small electronic devices, enabling them have a broader indoor application prospect. However, the mechanical stability of flexible perovskite photovoltaics is an urgent issue solved. Herein, a kind of 3D crosslinking agent named borax is selected to carry out grain boundary penetration treatment on perovskite film to realize full-dimensional stress release. This strategy improves the mechanical and phase stabilities of perovskite films subjected to external forces or large temperature changes. The fabricated perovskite photovoltaics deliver a champion power conversion efficiency (PCE) of 21.63% under AM 1.5G illumination, which is the highest one to date. The merit of low trap states under weak light makes the devices present a superior indoor PCE of 31.85% under 1062 lux (LED, 2956 K), which is currently the best flexible perovskite indoor photovoltaic device. This work provides a full-dimensional grain boundary stress release strategy for highly stable flexible perovskite indoor photovoltaics.
钙钛矿光伏器件是驱动用于室内应用的低功率离网电子设备的有力潜在候选者。与刚性器件相比，柔性钙钛矿器件可为室内小型电子设备提供更合适的表面，使其具有更广阔的室内应用前景。然而，柔性钙钛矿光伏器件的机械稳定性是一个亟待解决的问题。在此，选择一种名为硼砂的3D交联剂对钙钛矿薄膜进行晶界渗透处理，以实现全维度应力释放。该策略提高了钙钛矿薄膜在外力或大温度变化下的机械稳定性和相稳定性。所制备的钙钛矿光伏器件在AM 1.5G光照下的最佳功率转换效率（PCE）为21.63%，这是迄今为止的最高值。弱光下低陷阱态的优点使器件在1062勒克斯（LED，2956 K）光照下呈现出31.85%的优异室内PCE，这是目前最好的柔性钙钛矿室内光伏器件。这项工作为高稳定性柔性钙钛矿室内光伏器件提供了一种全维度晶界应力释放策略。
