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arXiv 1404.5166cond-mat.mtrl-sci
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光催化界面的准粒子级排列

Quasiparticle level alignment for photocatalytic interfaces

Annapaoala Migani, Duncan J. Mowbray, Jin Zhao, Hrvoje Petek, Angel Rubio

摘要:

吸附分子层和半导体基底之间界面处的电子能级排列决定了许多光催化材料的活性和效率。基于标准密度泛函理论(DFT)的方法已经证明不能提供这种能级排列的定量描述。这需要适当处理各向异性屏蔽,需要使用准粒子(QP)技术。然而,QP算法的计算复杂性意味着界面水平的定量描述仍然是难以捉摸的。我们提供了一个系统的研究,一个典型的接口,裸露的和甲醇覆盖的金红石TiO $_2$(110)表面,以确定类型的多体理论需要获得一个准确的描述水平对齐。这是通过与亚稳态碰撞电子能谱(MIES)、紫外光电子能谱学(UPS)和双光子光电子能谱(2 PP)的直接比较来实现的。我们考虑GGA DFT,混合DFT和$G_0W_0$,$\mathrm{scQP}GW1$,$\mathrm{scQP}GW_0$,和$\mathrm{scQP}GW$ QP计算。我们的研究结果表明,$G_0W_0$,或我们最近推出的$\mathrm{scQP}GW1$的方法,需要获得正确的排列最高占用和最低未占用的界面分子水平(HOMO/LUMO)。这些计算为解释复杂有机分子-半导体界面的电子结构探针实验建立了新的标准。

英文摘要:

Electronic level alignment at the interface between an adsorbed molecular layer and a semiconducting substrate determines the activity and efficiency of many photocatalytic materials. Standard density functional theory (DFT) based methods have proven unable to provide a quantitative description of this level alignment. This requires a proper treatment of the anisotropic screening, necessitating the use of quasiparticle (QP) techniques. However, the computational complexity of QP algorithms has meant a quantitative description of interfacial levels has remained elusive. We provide a systematic study of a prototypical interface, bare and methanol covered rutile TiO$_2$(110) surfaces, to determine the type of many-body theory required to obtain an accurate description of the level alignment. This is accomplished via a direct comparison with metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS) and two-photon photoemission (2PP) spectra. We consider GGA DFT, hybrid DFT and $G_0W_0$, $\mathrm{scQP}GW1$, $\mathrm{scQP}GW_0$, and $\mathrm{scQP}GW$ QP calculations. Our results demonstrate that $G_0W_0$, or our recently introduced $\mathrm{scQP}GW1$ approach, are required to obtain the correct alignment of both highest occupied and lowest unoccupied interfacial molecular levels (HOMO/LUMO). These calculations set a new standard in the interpretation of electronic structure probe experiments of complex organic molecule-semiconductor interfaces.

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