Large in-plane anisotropic 2D perovskites toward highly linear polarized light responses

Abstract

Intrinsic polarization-sensitive materials have achieved booming status in light polarization detection for the merits of direct detection, easy miniaturization, and low manufacturing cost. The promising optoelectronic properties and favorable structure tunability of two-dimensional (2D) perovskites provide valuable supplements for traditional 2D materials in the field of polarization detection. However, almost all polarization-sensitive 2D perovskites depend on hard-to-use out-of-plane anisotropy, and an effective strategy to achieve excellent in-plane anisotropy for polarization detection remains a great challenge. In this work, a pair of 2D chiral perovskites with large structural distortion was constructed by introducing chiral carboxylate amine cations and the unique cationic assembly via strong hydrogen bonding interacts intensely with inorganic sheets to bring about huge in-plane structural anisotropy. Based on the significant in-plane structural and electronic anisotropy, the fabricated device exhibits a high photocurrent anisotropy ratio of up to 8 under 405 nm irradiation. This work enlightens the mechanism of 2D perovskites with large in-plane anisotropy and provides an effective strategy utilizing homochirality to achieve excellent in-plane polarization detection.