Atomistic Origin of Urbach Tails in Amorphous Silicon

Details Atomistic Origin of Urbach Tails in Amorphous Silicon Atomistic Origin of Urbach Tails in Amorphous Silicon

2008-02-10

arxiv.org/abs/0802.1292v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.206403

Exponential band edges have been observed in a variety of materials, both crystalline and amorphous. In this paper, we infer the structural origins of these tails in amorphous and defective crystalline Si by direct calculation with current {\it ab initio} methods. We find that exponential tails appear in relaxed models of diamond with suitable point defects. In amorphous silicon (a-Si), we find that structural filaments of short bonds and long bonds exist in the network, and that the tail states near the extreme edges of both band tails are are also filamentary, with much localization on the structural filaments. We connect the existence of both filament systems to structural relaxation in the presence of defects and or topological disorder.

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