Open AccessLuminescent and Photoconductive Layered Lead Halide Perovskite Compounds Comprising Mixtures of Cesium and Guanidinium Cations
Author(s) -
Olga Nazarenko,
Martin Kotyrba,
Michael Wörle,
Eduardo CuervoReyes,
Sergii Yakunin,
Maksym V. Kovalenko
Publication year - 2017
Publication title -
inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 233
eISSN - 1520-510X
pISSN - 0020-1669
DOI - 10.1021/acs.inorgchem.7b01204
Subject(s) - chemistry , halide , perovskite (structure) , caesium , luminescence , photoluminescence , photovoltaics , crystal structure , inorganic chemistry , crystallite , photoconductivity , photochemistry , crystallography , optoelectronics , photovoltaic system , ecology , physics , biology
Interest in hybrid organic-inorganic lead halide compounds with perovskite-like two-dimensional crystal structures is growing due to the unique electronic and optoelectronic properties of these compounds. Herein, we demonstrate the synthesis, thermal and optical properties, and calculations of the electronic band structures for one- and two-layer compounds comprising both cesium and guanidinium cations: Cs[C(NH 2 ) 3 ]PbI 4 (I), Cs[C(NH 2 ) 3 ]PbBr 4 (II), and Cs 2 [C(NH 2 ) 3 ]Pb 2 Br 7 (III). Compounds I and II exhibit intense photoluminescence at low temperatures, whereas compound III is emissive at room temperature. All of the obtained substances are stable in air and do not thermally decompose until 300 °C. Since Cs + and C(NH 2 ) 3 + are increasingly utilized in precursor solutions for depositing polycrystalline lead halide perovskite thin films for photovoltaics, exploring possible compounds within this compositional space is of high practical relevance to understanding the photophysics and atomistic chemical nature of such films.