半导体
异质结
材料科学
金属-绝缘体过渡
激发
库仑
凝聚态物理
绝缘体(电)
光电子学
电压
金属
电子
物理
量子力学
冶金
作者
R. Yang,Zeqiang He,Shiquan Lin,Wenjie Dou,Zhong Lin Wang,Haiyan Wang,Jun Liu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-11-07
卷期号:22 (22): 9084-9091
被引量:5
标识
DOI:10.1021/acs.nanolett.2c03481
摘要
Tribovoltaic direct-current (DC) nanogenerator made of dynamic semiconductor heterojunction is emerging as a promising mechanical energy harvesting technology. However, fundamental understanding of the mechano-electronic carrier excitation and transport at dynamic semiconductor interfaces remains to be investigated. Here, we demonstrated for the first time, that tribovoltaic DC effect can be tuned with metal-insulator transition (MIT). In a representative MIT material (vanadium dioxide, VO2), we found that the short-circuit current (ISC) can be enhanced by >20 times when the material is transformed from insulating to metallic state upon static or dynamic heating, while the open-circuit voltage (VOC) turns out to be unaffected. Such phenomenon may be understood by the Hubbard model for Mott insulator: orders’ magnitude increase in conductivity is induced when the nearest hopping changes dramatically and overcomes the Coulomb repulsion, while the Coulomb repulsion giving rise to the quasi-particle excitation energy remains relatively stable.
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