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Resolving the discrepancies in the reported optical absorption of low-dimensional non-toxic perovskites, Cs3Bi2Br9 and Cs3BiBr6
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-13 , DOI: 10.1039/d0tc02783a Minh N. Tran 1, 2, 3, 4, 5 , Iver J. Cleveland 1, 2, 3, 4, 5 , Eray S. Aydil 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-13 , DOI: 10.1039/d0tc02783a Minh N. Tran 1, 2, 3, 4, 5 , Iver J. Cleveland 1, 2, 3, 4, 5 , Eray S. Aydil 1, 2, 3, 4, 5
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In the search for lead-free perovskites for solar cells, cesium bismuth halides are emerging as potential optoelectronic materials. Cs+, Bi3+ and Br− can form multiple compounds with different stoichiometries and crystal structures. Among these, Cs3Bi2Br9 and Cs3BiBr6 are stable in air at room temperature. Published optical absorption data for Cs3Bi2Br9 vary significantly from article to article, while there are limited data on the newly discovered Cs3BiBr6. Herein we resolve the discrepancies in the literature and fill in the knowledge gaps by depositing phase pure Cs3Bi2Br9 and Cs3BiBr6 thin films via co-evaporation of CsBr and BiBr3 in high vacuum and studying the effects of CsBr:BiBr3 ratio on the optical properties of well-characterized films. Cs3Bi2Br9 and Cs3BiBr6 thin films show absorption peaks centered at 435 nm and 383 nm, respectively. These peaks are associated with excitations localized on [BiBr6]3− octahedra in the solid phase but the latter also coincides with absorption by [BiBr6]3− in liquid solutions. We show that the discrepancies in the literature on optical absorption of Cs3Bi2Br9 can have two explanations: Cs3BiBr6 phase impurities or the inevitable absorption by dissolved [BiBr6]3− in colloidal dispersions, which may be easily misinterpreted as originating from the solid product.
中文翻译：
解决了报告的低维无毒钙钛矿Cs3Bi2Br9和Cs3BiBr6的光吸收差异
在寻找用于太阳能电池的无铅钙钛矿时，卤化铯铋正在成为潜在的光电材料。CS +，铋3+和Br -可以形成具有不同的化学计量和晶体结构的多个化合物。其中，Cs 3 Bi 2 Br 9和Cs 3 BiBr 6在室温下在空气中稳定。Cs 3 Bi 2 Br 9的已发表光吸收数据因文章而异，而新发现的Cs 3 BiBr 6的数据有限。在这里，我们通过在高真空下通过共蒸发CsBr和BiBr 3沉积相纯Cs 3 Bi 2 Br 9和Cs 3 BiBr 6薄膜并解决CsBr的影响来解决文献中的差异并填补知识空白。BiBr 3比率对表征良好的薄膜的光学性能的影响。Cs 3 Bi 2 Br 9和Cs 3 BiBr 6薄膜分别显示出以435 nm和383 nm为中心的吸收峰。这些峰与位于[BiBr 6 ] 3-上的激发相关固相的八面体，但后者也与[BiBr 6 ] 3-在液相中的吸收相吻合。我们发现，Cs 3 Bi 2 Br 9的光吸收文献中的差异可以有两种解释：Cs 3 BiBr 6相杂质或胶体分散体中溶解的[BiBr 6 ] 3−不可避免的吸收，这可能很容易误解。源于固体产品。
更新日期：2020-08-06
中文翻译：
解决了报告的低维无毒钙钛矿Cs3Bi2Br9和Cs3BiBr6的光吸收差异
在寻找用于太阳能电池的无铅钙钛矿时，卤化铯铋正在成为潜在的光电材料。CS +，铋3+和Br -可以形成具有不同的化学计量和晶体结构的多个化合物。其中，Cs 3 Bi 2 Br 9和Cs 3 BiBr 6在室温下在空气中稳定。Cs 3 Bi 2 Br 9的已发表光吸收数据因文章而异，而新发现的Cs 3 BiBr 6的数据有限。在这里，我们通过在高真空下通过共蒸发CsBr和BiBr 3沉积相纯Cs 3 Bi 2 Br 9和Cs 3 BiBr 6薄膜并解决CsBr的影响来解决文献中的差异并填补知识空白。BiBr 3比率对表征良好的薄膜的光学性能的影响。Cs 3 Bi 2 Br 9和Cs 3 BiBr 6薄膜分别显示出以435 nm和383 nm为中心的吸收峰。这些峰与位于[BiBr 6 ] 3-上的激发相关固相的八面体，但后者也与[BiBr 6 ] 3-在液相中的吸收相吻合。我们发现，Cs 3 Bi 2 Br 9的光吸收文献中的差异可以有两种解释：Cs 3 BiBr 6相杂质或胶体分散体中溶解的[BiBr 6 ] 3−不可避免的吸收，这可能很容易误解。源于固体产品。
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