Si nanoparticle interfaces in Si/SiO2 solar cell materials

Details Si nanoparticle interfaces in Si/SiO2 solar cell materials Si nanoparticle interfaces in Si/SiO2 solar cell materials

2011-06-09

arxiv.org/abs/1106.1753v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

Novel solar cell materials consisting of Si nanoparticles embedded in SiO2 layers have been studied using positron annihilation spectroscopy in Doppler broadening mode, and photoluminescence. Two positron-trapping interface states are observed after high temperature annealing at 1100{\deg}C. One of the states is attributed to the (SiO2/Si bulk) interface and the other to the interface between the Si nanoparticles and SiO2. A small reduction in positron trapping into these states is observed after annealing the samples in N2 atmosphere with 5% H2. Enhanced photoluminescence is also observed from the samples following this annealing step.

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