Phonon-assisted optical absorption in silicon from first principles

Details Phonon-assisted optical absorption in silicon from first principles Phonon-assisted optical absorption in silicon from first principles

2012-02-15

arxiv.org/abs/1202.3454v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.108.167402

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.

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