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arXiv 1705.04432cond-mat.mtrl-sci
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物质的内禀势和能带排列

Built-in potential and band alignment of matter

Duk-Hyun Choe, Damien West, Shengbai Zhang

摘要:

内建电位是两种不同材料界面处由于电偶极子而产生的界面电势差。它对于理解电化学、电气工程和材料科学中的许多现象至关重要,因为它决定了界面处的能带排列。尽管它的重要性,它的确切符号和大小一般被认为是一个定义不清的数量超过半个世纪。在这里,我们提供了一个普遍的定义的内置潜力。此外,内建电势明确地由体确定(即,当系统处于电子平衡时,界面仅在不平衡的情况下起作用。我们的定量理论能够统一描述各种重要的性质,在所有类型的接口,范围从功函数和肖特基势垒的电子设备的开路电压和电极电位的电化学电池。

英文摘要:

The built-in potential is the interfacial potential difference due to electric dipole at the interface of two dissimilar materials. It is of central importance to the understanding of many phenomena in electrochemistry, electrical engineering, and materials science because it determines the band alignment at the interfaces. Despite its importance, its exact sign and magnitude have generally been recognized as an ill-defined quantity for more than half a century. Here, we provide a universal definition of the built-in potential. Furthermore, the built-in potential is explicitly determined by the bulk (i.e., innate) properties of the constituent materials when the system is in electronic equilibrium, while the interface plays a role only in the absence of equilibrium. Our quantitative theory enables a unified description of a variety of important properties in all types of interfaces, ranging from work functions and Schottky barriers in electronic devices to open circuit voltages and electrode potentials in electrochemical cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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