Tribo-thermoelectric and tribovoltaic coupling effect at metal-semiconductor interface
Tribo-thermoelectric and tribovoltaic coupling effect at metal-semiconductor interface
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DOI：
10.1016/j.mtphys.2020.100295
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发表时间：
2020-09
影响因子：
11.5
通讯作者：
Z. Zhang;T. He;J. Zhao;G. Liu;Z.L. Wang;C. Zhang
中科院分区：
文献类型：
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作者：
Z. Zhang;T. He;J. Zhao;G. Liu;Z.L. Wang;C. Zhang
摩擦生热和摩擦起电是古老而常见的物理现象。半导体材料的摩擦生热通常是不受关注的，而在半导体界面上的摩擦生热又带来了新的摩擦生伏打效应。在这里，摩擦热电和摩擦伏打耦合效应的报告，通过摩擦半导体上的金属。摩擦能激发界面处的电子-空穴对，以在内置电场下产生DC电流。同时，摩擦产生的热量和局部温度的不均匀性驱动多数载流子从热侧向冷侧移动。结果表明，金属-半导体摩擦电纳米发电机的直流输出包括两部分：由热电效应产生的稳定部分和由摩擦伏打效应产生的波动部分。速度越快，压力越大，温差越大的热电压/电流越大，摩擦能越大的摩擦电压/电流越大。通过理论和实验分析证明了热电压/电流和摩擦电压/电流的几种叠加态，并证明了它们是由内建电场方向和半导体的多数载流子决定的。本工作不仅提出了摩擦与半导体的多物理场耦合效应，而且论证了基于半导体界面的多物理场能量收集。
Frictional heating and triboelectrification are ancient and common physical phenomena. Fricting at a semiconductor interface has brought new tribovoltaic effect, while the frictional heating on semiconductor materials is usually unattended. Here, a tribo-thermoelectric and tribovoltaic coupling effect is reported by rubbing a metal on a semiconductor. The friction energy excites electron-hole pairs at the interface to generate a DC current under the built-in electric field. Meanwhile, the friction generated heat and local temperature non-uniformity drives the majority carrier to move from the hot side toward cold side. The results reveal that the direct-current output of the metal-semiconductor triboelectric nanogenerator includes two parts: the stable part by thermoelectric effect and the fluctuant part by tribovoltaic effect. Faster velocity, larger pressure can enhance both the thermo-voltage/current with larger temperature difference and tribo-voltage/current with more frictional energy. Several superposition states of the thermo-voltage/current and tribo-voltage/current have been demonstrated by theoretical and experimental analysis, which are proven to be determined by the direction of the built-in electric field and the majority carriers of semiconductors. This work has not only proposed the multi-physics coupling effect by the combination of friction and semiconductor, but also demonstrated semiconductor interface based multisource energy harvesting.