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Conductance Switch of a Bromoplumbate Bistable Semiconductor by Electron‐Transfer Thermochromism
Author(s) -
Sun Cai,
Wang MingSheng,
Li PeiXin,
Guo GuoCong
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201610180
Subject(s) - thermochromism , semiconductor , bistability , electron transfer , conductance , materials science , organic semiconductor , x ray photoelectron spectroscopy , redox , valence (chemistry) , optoelectronics , nanotechnology , chemistry , chemical physics , photochemistry , chemical engineering , condensed matter physics , organic chemistry , physics , engineering , metallurgy
Electron‐transfer (redox) thermochromism was successfully used for switching the conductance of semiconductors, by introducing a thermally active organic component into an inorganic semiconducting framework. A moisture‐resistant semiconductor {(MV) 2 [Pb 7 Br 18 ]} n (MV 2+ =methyl viologen cation) has been prepared through an in situ synthetic method for MV 2+ . It features a rare 3D haloplumbate open framework and unprecedented electron‐transfer thermochromic behavior in haloplumbates. The electrical conductivity of this compound dropped significantly after coloration and restored after decoloration, which was satisfactorily explained by valence band XPS and theoretical data. This work not only offers a new approach to modify electrical properties of semiconductors without altering components or structures, but may lead to the development of over‐temperature color indicators, circuit overload protectors or photovoltaic materials.