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Title: Low-Temperature Synthesis of Bismuth Chalcohalides: Candidate Photovoltaic Materials with Easily, Continuously Controllable Band gap.
Authors: Kunioku, Hironobu
Higashi, Masanobu
Abe, Ryu  kyouindb  KAKEN_id
Author's alias: 国奥, 広伸
東, 正信
阿部, 竜
Issue Date: 7-Sep-2016
Publisher: Springer Nature
Journal title: Scientific reports
Volume: 6
Thesis number: 32664
Abstract: Although bismuth chalcohalides, such as BiSI and BiSeI, have been recently attracting considerable attention as photovoltaic materials, the methods available to synthesize them are quite limited thus far. In this study, a novel, facile method to synthesize these chalcohalides, including BiSBr[1-x]I[x] solid solutions, at low temperatures was developed via the substitution of anions from O[2-] to S[2-] (or Se[2-]) using bismuth oxyhalide precursors. Complete phase transition was readily observed upon treatment of BiOI particles with H[2]S or H[2]Se at surprisingly low temperatures of less than 150 °C and short reaction times of less than 1 h, producing BiSI and BiSeI particles, respectively. This method was also applied for synthesizing BiSBr[1-x]I[x'] where continuous changes in their band gaps were observed depending on the ratio between iodine and bromine. The composition of all elements (except oxygen) in the chalcohalides thus produced was almost identical to that of the oxyhalide precursors, attributed to the suppressed volatilization of halogens at such low temperatures. All chalcohalides loaded on FTO clearly exhibited an anodic photocurrent in an acetonitrile solution containing I(-), attributed to their n-type nature, e.g., the BiSI electrode exhibited high IPCE (64% at 700 nm, +0. 2 V vs. Ag/AgCl).
Description: 光吸収の自在制御が可能な金属カルコハライドの低温合成法を開発 -フレキシブル太陽電池や発光ダイオードへの応用に期待-. 京都大学プレスリリース. 2016-09-08.
Rights: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article&'s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/216541
DOI(Published Version): 10.1038/srep32664
PubMed ID: 27600662
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2016-09-08
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