Organic-Inorganic Hybrid Gold Halide Perovskites: Structural Diversity through Cation Size

Hideaki Murasugi; Shohei Kumagai; Hiroaki Iguchi; Masahiro Yamashita; Shinya Takaishi

doi:10.1002/chem.201901288

Organic-Inorganic Hybrid Gold Halide Perovskites: Structural Diversity through Cation Size

Chemistry. 2019 Jul 25;25(42):9885-9891. doi: 10.1002/chem.201901288. Epub 2019 Jul 2.

Authors

Hideaki Murasugi¹, Shohei Kumagai^{1

2}, Hiroaki Iguchi¹, Masahiro Yamashita^{1

3

4}, Shinya Takaishi¹

Affiliations

¹ Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan.
² Present address: Department of Advanced Materials Sciences, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan.
³ Advanced Institute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
⁴ School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China.

PMID: 31095786
DOI: 10.1002/chem.201901288

Abstract

Crystal structures of a series of organic-inorganic hybrid gold iodide perovskites, formulated as A₂ [Au^I I₂ ][Au^III I₄ ] [A=methylammonium (MA) (1) and formamidinium (FA) (2)], A'₂ [I₃ ]_1-x [Au^I I₂ ]_x [Au^III I₄ ] [A'=imidazolium (IMD) (3), guanidinium (GUA) (4), dimethylammonium (DMA) (5), pyridinium (PY) (6), and piperizinium (PIP) (7)], systematically changed depending on the cation size. In addition, triiodide (I₃ ^- ) ions were partly incorporated into the AuI₂ ^- sites of 3-7, whereas they were not incorporated into those of 1 and 2. Such a difference comes from the size of the organic cation. Optical absorption spectra showed characteristic intervalence charge-transfer bands from Au^I to Au^III species, and the optical band gap increased as the size of the cation became larger.

Keywords: charge transfer; coordination chemistry; mixed valence; organic-inorganic perovskites; solar cells.

Abstract

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