γ‑rayRadiation on Flexible PerovskiteSolar Cells

Flexible solar cells are promising for space applications due to their unique properties including lightweight and flexibility. In particular, flexible perovskite solar cells (f-PSCs) with high efficiencies have a much stronger competitiveness, but study about the radiation tolerance of f-PSCs is still absent. Herein, the radiation tolerance of methylammonium (MA)/formamidinium (FA)/cesium (Cs)-based triple cation f-PSCs under γ-ray was investigated systematically, with a planar heterojunction structure of PEN/ITO/SnO2/perovskite/spiro-OMeTAD/Ag. The results show that the photovoltaic performance of the cells experienced an obvious deterioration after γ-ray irradiation, especially the short-circuit current density. It is mainly attributed to the decreased transparency of the flexible substrate, namely, poly­(ethylene naphthalate) (PEN), and the decomposition of perovskite films under γ-ray irradiation. In spite of the performance degradation, the radiation tolerance of f-PSCs was still much better than that of rigid counterparts. It suggests that f-PSCs are more suitable for space application, showing better prospects.