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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 international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201812554
Subject(s) - superlattice , iodide , halide , photoconductivity , semiconductor , ionic bonding , materials science , lead (geology) , conductance , dielectric , chemistry , optoelectronics , photochemistry , inorganic chemistry , condensed matter physics , ion , organic chemistry , physics , geomorphology , geology
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.