Le-Yu Bi and Yue-Qiao Hu published a new article on J. Mater. Chem. A. Congratulations!

Title: Two-dimensional lead-free iodide-based hybrid double perovskites: crystal growth, thin-film preparation and photocurrent responses

Abstract

Organometal halide perovskites (OHPs) are a kind of promising material applied in solar cell. However, the toxicity of lead in OHPs is considered as an environmental problem. Herein, we report two lead-free two-dimensional (2D) iodide-based OHPs with double perovskite structure, namely (C6H16N2)2AgBiI8·H2O (AgBiI) and (C6H16N2)2CuBiI8·0.5H2O (CuBiI) where C6H14N2 = 1,4-cyclohexanediamine. These two bimetallic perovskites show optical band gaps of 1.93 eV and 1.68 eV respectively. In addition, such 2D perovskite materials can form smooth films through a simple one-step spin-coating approach. Photocurrent measurements under xenon lamp irradiation indicate obvious photoresponses, suggesting that these semiconducting materials have potential application for light harvesting.