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From Lead Iodide to a Radical Form Lead‐Iodide Superlattice: High Conductance Gain and Broader Band for Photoconductive Response
Author(s) -
Wang GuanE,
Xu Gang,
Zhang NingNing,
Yao MingShui,
Wang MingSheng,
Guo GuoCong
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201812554
Subject(s) - iodide , superlattice , photoconductivity , halide , ionic bonding , semiconductor , chemistry , materials science , photochemistry , conductance , optoelectronics , inorganic chemistry , ion , organic chemistry , condensed matter physics , physics
Superlattice materials offer new opportunities to modify optical and electrical properties of recently emerging 2D materials. The insertion of tetraethylbenzidine (EtDAB) into interlamination of the established 2D PbI 2 semiconductor through a mild solution method yielded the first lead iodide superlattice, EtDAB⋅4PbI 2 (EtDAB=tetraethylbenzidine), with radical and non‐radical forms. The non‐radical form has a non‐ionic structure that differs from the common ionic structures for inorganic–organic hybrid lead halides. The radical form shows five orders of magnitude greater conductance and broader photoconductive response range (UV/Vis → UV/Vis‐IR), than pure PbI 2 and the non‐radical form of the superlattice.