A halogen bonding assembled hybrid copper halide framework as a promising hypotoxicity photodetector?

Inorganic Chemistry Frontiers Pub Date: 2022-10-24 DOI: 10.1039/D2QI01441F

Abstract

Copper has become a favored Pb-free candidate in the exploration of metal halide photoelectric materials; however, the known hybrid copper halides (HCHs) suffer from wide band gaps, low absorption coefficients or large exciton binding energies (Eb), hindering their application as photodetectors. Combining functional aryl thioether with copper halide in one crystal lattice is greatly desired. However, it is impeded by the intricate and environment-unfriendly multi-step organic synthesis of aryl thioether, which involves harsh reaction conditions, toxic organic reagents and noble metal catalysts. Herein, we report the first Cl?Cl halogen bonding (XB) assembled HCH conductive framework with aryl thioether as ligand, {bis(5-chloropyridin-2-yl)sulfane(CuI)}n (BCS-CuI). It was obtained by a well-designed facile and sustainable “All-in-One” synthesis strategy, where aryl halides, noble metals and harsh reaction conditions are not involved. Property measurements and theoretical calculations disclose that the XB assembled three-dimensional framework contributes significantly to the physical properties of BCS-CuI, which exhibits a small band gap of 2.44 eV, strong optical absorption and a relatively small Eb value of 55.8 meV. Importantly, BCS-CuI exhibits great potential application as a hypotoxicity photodetector with a high photoresponse on/off ratio of 32.9 and carrier concentration and mobility superior to that of the well-known methylamine lead iodide (CH3NH3)PbI3.

Graphical abstract: A halogen bonding assembled hybrid copper halide framework as a promising hypotoxicity photodetector
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