Abstract
Circularly polarized light (CPL) detection has wide applications in many fields, where the anisotropy factor (g(Iph) ) is an important indicator to characterize the CPL detection performance. So far, many materials with high g(Iph) have been reported, however, the exploration of the regulation of g(Iph) is still in its infancy. Herein, two novel alternating chiral-achiral cations intercalation-type chiral hybrid perovskites (CHPs), named (R/S-1-phenylpropylamine)(propylamine)PbBr(4) (1-R/S), exhibit above room-temperature (RT) polar-phase transition, which greatly regulates the g(Iph) value. The g(Iph) of 1-R is 0.04 in high-temperature phase chiral non-polar (P2(1) 2(1) 2(1) ) by applying 5 V bias, interestingly, with the temperature decrease, the g(Iph) value in low-temperature phase chiral polar (P2(1) ) gradually increases (0.22@360K, 0.40@340K, 0.47@320K), and finally reaches a maximum of 0.5 at RT. Such value is not only the highest among 2D CHPs to date, but presents a 12.5-fold amplification compared with 0.04. Further, this rare phenomenon should be attributed to the built-in electric field induced by the polar photovoltaic effect, which sheds light on further obtaining CHPs with large g(Iph) .