Wu Huajie, Xu Zhijin, Dong Xin, Wang Lei, Liang Jing, Chen Tianqi, Li Xiaoqi, Li Lina, Luo Junhua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002, China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fujian 350108, China.
ACS Appl Mater Interfaces. 2023 Dec 6;15(48):56034-56040. doi: 10.1021/acsami.3c13650. Epub 2023 Nov 17.
Hybrid perovskites have great potential in photovoltaics and photodetection. Specially, two-dimensional (2D) hybrid perovskites have been discovered to show distinctive applications in polarization-sensitive photodetection due to their intrinsic anisotropy. Herein, we designed a new type of 2D perovskite by introducing bifunctional alkylammonium as an organic spacer, (β-Ala)PbBr (, where β-Ala is 3-aminopropanoic), which has four organic spacers in adjacent inorganic layers and adjacent organic layers are linked by hydrogen bonding. The pioneering structure with four organic spacers enables an intrinsic high strong anisotropy, facilitating polarization-sensitive detection. The analysis of the crystal structure and optical properties further elucidates the natural anisotropic properties of . Strikingly, has a strong optical dichroism (α/α ≈ 7.4 in 405 nm), and the polarization-sensitive detector on single crystals of exhibits a large polarization ratio (/ ≈ 2.0). This result highlights that the employment of bifunctional cations is efficient to explore new type 2D perovskites for potentially high-performance polarization-sensitive detection.
