Radiation Photovoltaics in a 2D Multilayered Chiral‐Polar Halide Perovskite toward Efficient Self‐Driven X‐Ray Detection

Abstract

Abstract2D multilayered organic‐inorganic hybrid perovskites (OIHPs) have exhibited bright prospects for high‐performance self‐driven X‐ray detection due to their strong radiation absorption and long carrier transport. However, as an effective tool for self‐driven X‐ray detection, radiation photovoltaics remain rare, and underdeveloped in multilayered OIHPs. Herein, chirality to induce radiation photovoltaics in 2D multilayered chiral OIHPs is first utilized for efficient self‐driven X‐ray detection. Specifically, under X‐ray irradiation, a multilayered chiral‐polar (S‐BPEA)2FAPb2I7 (1‐S, S‐BPEA = (S)‐1‐4‐Bromophenylethylammonium, FA = formamidinium) shows remarkable radiation photovoltaics of 0.85 V, which endows 1‐S excellent self‐driven X‐ray detection performance with a considerable sensitivity of 87.8 µC Gyair−1 cm−2 and a detection limit low to 161 nGyair s−1. Moreover, the sensitivity is high up to 1985.9 µC Gyair−1 cm−2 under 80 V bias, higher than most those of 2D OIHPs. These results demonstrate that chirality‐induced radiation photovoltaics is an efficient strategy for self‐driven X‐ray detection.