Surface in situ reconstruction of inorganic perovskite films enabling long carrier lifetimes and solar cells with 21% efficiency

Chu, X., Ye, Q., Wang, Z. et al.

Nat Energy (2023).

https://doi.org/10.1038/s41560-023-01220-z

Researchers developed a surface in situ reconstruction (SISR) strategy using CsF treatment to improve all-inorganic perovskite solar cells. The treatment suppresses non-radiative recombination, passivates surface defects, and promotes hole extraction. It results in a longer carrier lifetime and creates a graded heterojunction. As a result, CsPbIxBr3−x solar cells with SISR achieve a 21.02% efficiency, a 1.27 V open-circuit voltage, and an 85.3% fill factor. This work offers an effective approach to enhance inorganic perovskite surfaces for efficient solar cells.

Electrical impedance spectroscopy (EIS), capacitance–voltage (C–V) and photogenerated charge extraction by linearly increasing voltage (photo-CELIV) mobilities data were measured by the all-in-one characterization platform Paios (Fluxim AG) in air conditions without encapsulation.