|
|||||
|
|
Organic–Inorganic Hybrid Gold Halide Perovskites: Structural Diversity through Cation Size |
|
| Authors: | Hideaki Murasugi Dr Shohei Kumagai Dr Hiroaki Iguchi Prof Dr Masahiro Yamashita Dr Shinya Takaishi |
| Institution: | 1. Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578 Japan;2. Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578 Japan
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. Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578 Japan Advanced Institute of Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 Japan School of Materials Science and Engineering, Nankai University, Tianjin, 300350 China |
| Abstract: | Crystal structures of a series of organic–inorganic hybrid gold iodide perovskites, formulated as A2AuII2]AuIIII4] A=methylammonium (MA) ( 1 ) and formamidinium (FA) ( 2 )], A′2I3]1−xAuII2]xAuIIII4] 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 AuI to AuIII species, and the optical band gap increased as the size of the cation became larger. |
| Keywords: | coordination chemistry charge transfer mixed valence organic–inorganic perovskites solar cells |