Full-Dimensional Grain Boundary Stress Release for Flexible Perovskite Indoor Photovoltaics

作者：

Chun-Hao Chen,^#,1 Zhen-Huang Su,^#,2 Yan-Hui Lou,³ Yan-Jun Yu,¹ Kai-Li Wang,¹ Gen-Lin Liu,¹ Yi-Ran Shi,¹ Jing Chen,¹ Jun-Jie Cao,¹ Liang Zhang,¹ Xing-Yu Gao,² and Zhao-Kui Wang^1,*

单位：

¹ Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China.

² Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.

³ College of Energy, Soochow Institute for Energy and Materials Innovations, Soochow University, Suzhou 215006, China.

摘要：

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.

影响因子：

30.849

分区情况：

一区

链接：

https://doi.org/10.1002/adma.202200320