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arXiv 1202.3454cond-mat.mtrl-sci
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基于第一性原理的硅声子辅助光吸收

Phonon-assisted optical absorption in silicon from first principles

Jesse Noffsinger, Emmanouil Kioupakis, Chris G. Van de Walle, Steven G. Louie, Marvin L. Cohen

摘要:

完全从第一性原理出发,在准粒子水平上计算了硅的声子辅助带间光吸收谱。我们利用Wannier插值形式主义,以确定准粒子的能量,以及光学跃迁和电子-声子耦合矩阵元,在细网格的布里渊区。计算的光谱附近的间接吸收的发病是在一个温度范围内的实验测量非常好的协议。此外,我们的方法可以准确地确定硅在可见光范围内的光吸收光谱,这是光电和光伏应用的一个重要过程,不能用简单的模型来解决。计算形式是相当普遍的,可以用来理解一般的声子辅助吸收过程。

英文摘要:

The phonon-assisted interband optical absorption spectrum of silicon is calculated at the quasiparticle level entirely from first principles. We make use of the Wannier interpolation formalism to determine the quasiparticle energies, as well as the optical transition and electron-phonon coupling matrix elements, on fine grids in the Brillouin zone. The calculated spectrum near the onset of indirect absorption is in very good agreement with experimental measurements for a range of temperatures. Moreover, our method can accurately determine the optical absorption spectrum of silicon in the visible range, an important process for optoelectronic and photovoltaic applications that cannot be addressed with simple models. The computational formalism is quite general and can be used to understand the phonon-assisted absorption processes in general.

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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