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(TMT–TTF)[Pb2.6/30.4/3I2]3: a TTF-intercalated two-dimensional hybrid lead iodide: crystal structure and properties

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Abstract

The poorly conductive organic layers in two-dimensional (2D) perovskites create quantum wells, which hinder the carrier separation and transformation. Therefore, the search for new 2D hybrid lead-halide materials with conductive organic components is crucial to high performance 2D perovskite solar cells. Tetrathiafulvalene (TTF) and its derivatives are well-known building blocks for conductive organic materials. We report here a new compound containing TMT–TTF (tetrakis(methylthio)tetrathiafulvalene) and layered PbI2, formulated as (TMT–TTF)[Pb2.6/30.4/3I2]3 (1). Crystal structural analysis shows that compound 1 is a unique TMT–TTF-intercalated 2D hybrid lead iodide with partially oxidized TMT–TTF cations and Pb-vacancy in anion. Its structural characteristics give the compound a narrow band gap and high conductivity. Furthermore, the carrier density and the photoelectric properties are first evaluated for TTF-PbI compounds and the results show that these properties of 1 are superior to those of the previously reported TTF-PbI salt, which is attractive for exploiting new lead-halide materials.

Graphical abstract: (TMT–TTF)[Pb2.6/3□0.4/3I2]3: a TTF-intercalated two-dimensional hybrid lead iodide: crystal structure and properties

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Article information


Submitted
21 Aug 2019
Accepted
16 Dec 2019
First published
16 Dec 2019

New J. Chem., 2020, Advance Article
Article type
Paper

(TMT–TTF)[Pb2.6/30.4/3I2]3: a TTF-intercalated two-dimensional hybrid lead iodide: crystal structure and properties

W. Yin, Y. Weng, M. Jiang, S. Yu, Q. Zhu and J. Dai, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ04316K

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