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Invalidity of Band-Gap Engineering Concept for Bi3+ Heterovalent Doping in CsPbBr3 Halide Perovskite
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1021/acs.jpclett.8b02178 Olga A. Lozhkina 1 , Anna A. Murashkina 1 , Vladimir V. Shilovskikh 1 , Yury V. Kapitonov 1 , Vladimir K. Ryabchuk 1 , Alexei V. Emeline 1 , Tsutomu Miyasaka 2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1021/acs.jpclett.8b02178 Olga A. Lozhkina 1 , Anna A. Murashkina 1 , Vladimir V. Shilovskikh 1 , Yury V. Kapitonov 1 , Vladimir K. Ryabchuk 1 , Alexei V. Emeline 1 , Tsutomu Miyasaka 2
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Heterovalent CsPbBr3 doping with Bi results in a significant red shift of the optical absorption of both single-crystal and powdered samples. The results of low-temperature (3.6 K) photoluminescence studies of perovskite single crystals indicate that the position of the excitonic luminescence peak remains unaffected by Bi doping that, in turn, infers that the band gap of Bi-doped perovskite is not changed as well. The position and state density distribution of the valence band and Fermi level of single-crystal perovskites were determined by another direct method of ultraviolet photoelectron spectroscopy. The obtained results show that Bi3+ doping causes no changes in the valence band structure but an increase in the Fermi level by 0.6 eV. The summary of the obtained results directly demonstrates that the concept of the band-gap engineering in Bi3+-doped CsPbBr3 halide perovskite is not valid.
中文翻译：
CsPbBr 3卤化物钙钛矿中Bi 3+异质掺杂的带隙工程概念无效。
掺有Bi的CsPbBr 3异质掺杂导致单晶和粉末样品的光吸收发生明显的红移。钙钛矿单晶的低温（3.6 K）光致发光研究结果表明，Bi掺杂不会影响激子发光峰的位置，从而推断出Bi掺杂钙钛矿的带隙也没有改变。 。用另一种直接的紫外光电子能谱法确定了单晶钙钛矿的价带和费米能级的位置和态密度分布。所得结果表明Bi 3+掺杂不会使价带结构发生任何变化，但会使费米能级增加0.6 eV。所得结果的总结直接表明，Bi 3+掺杂的CsPbBr 3卤化物钙钛矿中的带隙工程学概念无效。
更新日期：2018-09-06
中文翻译：
CsPbBr 3卤化物钙钛矿中Bi 3+异质掺杂的带隙工程概念无效。
掺有Bi的CsPbBr 3异质掺杂导致单晶和粉末样品的光吸收发生明显的红移。钙钛矿单晶的低温（3.6 K）光致发光研究结果表明，Bi掺杂不会影响激子发光峰的位置，从而推断出Bi掺杂钙钛矿的带隙也没有改变。 。用另一种直接的紫外光电子能谱法确定了单晶钙钛矿的价带和费米能级的位置和态密度分布。所得结果表明Bi 3+掺杂不会使价带结构发生任何变化，但会使费米能级增加0.6 eV。所得结果的总结直接表明，Bi 3+掺杂的CsPbBr 3卤化物钙钛矿中的带隙工程学概念无效。
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