Affiliation:
1. State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P. R. China
2. University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100039 P. R. China
Abstract
AbstractPhotorefractive effect of ferroelectrics refers to the light‐induced change of refractive index, which is an optical controlling avenue in holographic storage and image processing. For most ferroelectrics, however, the small photorefractive effect (10−5–10−4) hinders their practical application and it is urgent to exploit new photorefractive system. Here, for the first time, strong photorefractive effects are achieved in a 2D metal‐halide ferroelectric, [CH3(CH2)3NH3]2(CH3NH3)Pb2Cl7 (1), showing large spontaneous polarization (≈4.1 µC cm−2) and wide optical bandgap (≈3.20 eV). Notably, under light irradiation, 1 enables a large variation of refractive indices up to ≈ 1× 10−3, being one order higher than the existing materials and comparable to the state‐of‐the‐art inorganic ferroelectrics. This intriguing photorefractive behavior involves with the sharp variation of polarization caused by photo‐pyroelectricity. As the first report of 2D metal‐halide photorefractive ferroelectric, this work sheds light on optical controlling of physical properties in electric‐ordered materials.
Funder
National Postdoctoral Program for Innovative Talents
National Key Research and Development Program of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry