Two-Second-Annealed 2D/3D Perovskite Films with Graded Energy Funnels and Toughened Heterointerfaces for Efficient and Durable Solar Cells

Angew Chem Int Ed Engl. 2023 Aug 4:e202309292. doi: 10.1002/anie.202309292. Online ahead of print.ABSTRACTThe 2D/3D perovskite heterostructures have been widely investigated to enhance the efficiency and stability of perovskite solar cells (PSCs). However, rational manipulation of phase distribution and energy level alignment in such 2D/3D perovskite hybrids are still of great challenge. Herein, we successfully achieved spontaneous phase alignment of 2D/3D perovskite heterostructures by concurrently introducing both 2D perovskite component and organic halide additive. The graded phase distribution of 2D perovskites with different n values and 3D perovskites induced favorable energy band alignment across the perovskite film and boosted the charge transfer at the relevant heterointerfaces. Moreover, the 2D perovskite component also acted as a "band-aid" to simultaneously passivate the defects and release the residual tensile stress of perovskite films. Encouragingly, the blade-coated PSCs based on only ~2s in-situ flash annealed 2D/3D perovskite films with favorable energy funnels and toughened heterointerfaces achieved promising efficiencies of 22.5%, accompanied by extended lifespan. To our knowledge, this is the highest reported efficiency for the PSCs fabricated with energy-saved thermal treatment just within a few seconds, which also outperformed those state-of-the-art annealing-free analogues. Such two-seconds in-situ annealing technique could save the energy cost by up t...

Source: Angewandte Chemie - August 4, 2023 Category: Chemistry Authors: Xueqing Chang Jun-Xing Zhong Sibo Li Qin Yao Yuxuan Fang Guo Yang Ying Tan Qifan Xue Longbin Qiu Qingqian Wang Yong Peng Wu-Qiang Wu Source Type: research