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Title: Phonon lifetime in SiSn and its suitability for hot-carrier solar cells

We present a phononic and electronic study of SiSn in the zinc-blende phase. A detailed description of the longitudinal optical (LO) phonon decay in a three-phonon process is presented together with the corresponding lifetime. The necessity to go beyond the zone center phonon approximation in this case is highlighted as it reveals a steep dependence of the lifetime on the initial phonon wavenumber, which differs from usual semiconductors. The electronic band structure is calculated within the GW formalism and shows a small direct band gap. It is shown that the LO-phonon resulting from electron cooling has a lifetime four to eight orders of magnitude above all the known value in semiconductors for this process. We finally show the suitability of SiSn for hot-carrier solar cells, as it is endowed with ultra-slow cooling of hot carriers.
Authors:
; ;  [1]
  1. Institute for Research and Development on Photovoltaic Energy (IRDEP), UMR 7174, EDF R and D/CNRS/Chimie ParisTech, 6 quai Watier, 78401 Chatou (France)
Publication Date:
OSTI Identifier:
22300081
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CARRIERS; COOLING; DECAY; ELECTRON COOLING; LIFETIME; PHONONS; SEMICONDUCTOR MATERIALS; SOLAR CELLS; ZINC SULFIDES