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Enhanced carrier-carrier interaction in optically pumped hydrogenated nanocrystalline silicon

We have measured experimentally and describe theoretically, ultra-fast relaxation of carriers in nanocrystalline silicon embedded in amorphous hydrogenated silicon. The goal was the identification of the mechanisms responsible for ultra-fast equilibration on a few femtoseconds time scale. Such materials have recently attracted considerable interest driven by the possibilities of developing electro-optical devices (solar cells, nonvolatile memory devices, and thin-film transistors). The authors are currently preparing an EPSRC grant proposal since this research fits the EPSRC Grand Challenge "Emergence and Physics Far From Equilibrium"