Direct Band Gap Mixed-Valence Organic–inorganic Gold Perovskite as Visible Light Absorbers
| Autor: | Biplab Ghosh, Shreyash Hadke, Nripan Mathews, Teck Ming Koh, Jason England, Lydia Helena Wong, Benny Febriansyah, Subodh Mhaisalkar, Padinhare Cholakkal Harikesh |
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| Přispěvatelé: | School of Materials Science and Engineering, School of Physical and Mathematical Sciences, Interdisciplinary Graduate School (IGS), Energy Research Institute @ NTU (ERI@N) |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Valence (chemistry) business.industry Electrical and electronic engineering::Semiconductors [Engineering] Halide Perovskites General Chemical Engineering Halide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Semiconductor Gold Perovskite Organic inorganic Materials Chemistry Direct and indirect band gaps 0210 nano-technology business Perovskite (structure) Visible spectrum |
| Zdroj: | Chemistry of Materials. 32:6318-6325 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Lead-free halide perovskite semiconductors are necessary due to the atmospheric instability and lead toxicity associated with the 3D lead halide perovskites. However, a stable lead-free perovskite with an ideal band gap (1.2-1.4 eV) for photovoltaics is still missing. In this work, we synthesized organic-inorganic gold halide double perovskites ((CH3NH3)2Au2X6, X = Br, I) through a solution-processed route that offers an ideal direct band gap for photovoltaic applications. Density functional theory calculations confirm the direct nature of the band gap with reasonable absorption coefficients in the visible range and excellent charge transport properties. In addition, the Au-halide perovskites show high chemical stability and photoresponse. These combined properties demonstrate that Au-based halide perovskites can be a promising group of compounds for optoelectronic applications. National Research Foundation (NRF) Accepted version This research was supported by the National Research Foundation, Prime Minister’s Office, Singapore, under its Competitive Research Programme (CRP Award No. NRF- 482 CRP14-2014-03) and Intra-CREATE Collaborative Grant (NRF2018-ITC001-001). We would also like to thank Dr. Li Yongxin for helping us solve the crystal structures of the materials presented herein. |
| Databáze: | OpenAIRE |
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