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arXiv 1607.07993cond-mat.mtrl-sci
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生色团-半导体界面价态光电子能谱和准粒子激发的定量分析

Quantitative analysis of valence photoemission spectra and quasiparticle excitations at chromophore-semiconductor interfaces

Christopher E. Patrick, Feliciano Giustino

摘要:

通过光电子能谱研究表面分子的准粒子激发是纳米技术研究的一个重要组成部分。解决这些接口的光谱特征,需要一个全面的理论,在分子和固体中的电子去除和添加过程,捕捉图像电荷,热效应和构型紊乱的复杂相互作用。在这里,我们发展这样一个理论和计算的准粒子能级排列和价光电子能谱的原型仿生太阳能电池之间的界面TiO 2和N3发色团。通过直接匹配我们的计算的光电子能谱的实验数据,我们澄清了原子的来源,在低结合能的发色团峰。这个案例研究设置了一个新的标准,在复杂的发色团/半导体界面的光电子能谱的解释。

英文摘要:

Investigating quasiparticle excitations of molecules on surfaces through photoemission spectroscopy forms a major part of nanotechnology research. Resolving spectral features at these interfaces requires a comprehensive theory of electron removal and addition processes in molecules and solids which captures the complex interplay of image charges, thermal effects and configurational disorder. We here develop such a theory and calculate the quasiparticle energy-level alignment and the valence photoemission spectrum for the prototype biomimetic solar cell interface between anatase TiO2 and the N3 chromophore. By directly matching our calculated photoemission spectrum to experimental data we clarify the atomistic origin of the chromophore peak at low binding energy. This case study sets a new standard in the interpretation of photoemission spectroscopy at complex chromophore/semiconductor interfaces.

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