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赵纪军
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主要任职: 物理学院院长

其他任职: 三束材料改性教育部重点实验室主任

性别: 男

毕业院校: 南京大学

学位: 博士

所在单位: 物理学院

学科: 凝聚态物理

电子邮箱: zhaojj@dlut.edu.cn

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A strain or electric field induced direct bandgap in ultrathin silicon film and its application in photovoltaics or photocatalysis

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论文类型: 期刊论文

第一作者: Cao, Tengfei

通讯作者: Liu, LM; Zhao, JJ (reprint author), Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.; Zhao, JJ (reprint author), Dalian Univ Technol, Minist Educ, Key Lab Mat Modificat Laser Ion & Elect Beams, Dalian 116024, Peoples R China.

合写作者: Wang, Da,Geng, Dong-Sheng,Liu, Li-Min,Zhao, Jijun

发表时间: 2016-03-14

发表刊物: PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录刊物: SCIE、PubMed

卷号: 18

期号: 10

页面范围: 7156-7162

ISSN号: 1463-9076

摘要: The indirect bandgap character of silicon greatly limits its applications in electronic or optoelectronic devices, and direct bandgaps are highly desirable in all silicon allotropes. The successful synthesis of ultrathin or even monolayer silicon films experimentally has opened new opportunities to further modulate the electronic structure of silicon through external modulation. In this work, strain or electric field effects on the electronic structure of ultrathin silicon film (USF) are systematically explored. The results demonstrate that all USFs are indirect band-gap semiconductors; interestingly, tensile strain or electric field efficiently tunes the USFs into direct band gap semiconductors. The indirect to direct band gap transition in the USFs not only extends their light adsorption spectra into the visible light region but also greatly enhances the adsorption intensity. Because of this, strained USFs have great potential to be used as a high-performance photovoltaic material. Furthermore, the high stability, moderate band-gap and proper band edge positions demonstrate that monolayer and bilayer USFs can also be used as photocatalysts for water splitting.

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