All optical method for investigation of spin and charge transport in semiconductors : combination of spatially and time-resolved luminescence Article - 2014

Fabian Cadiz, Philippe Barate, D. Paget, Denis Grebenkov, J.P. Korb, A.C.H. Rowe, Thierry Amand, Steve Arscott, Emilien Peytavit

Fabian Cadiz, Philippe Barate, D. Paget, Denis Grebenkov, J.P. Korb, A.C.H. Rowe, Thierry Amand, Steve Arscott, Emilien Peytavit, « All optical method for investigation of spin and charge transport in semiconductors : combination of spatially and time-resolved luminescence  », Journal of Applied Physics, 2014, 023711, 9 pages. ISSN 0021-8979

Abstract

A new approach is demonstrated for investigating charge and spin diffusion as well as surface and bulk recombination in unpassivated doped semiconductors. This approach consists in using two complementary, conceptually related, techniques, which are time-resolved photoluminescence (TRPL) and spatially resolved microluminescence (μ PL) and is applied here to p + GaAs. Analysis of the sole TRPL signal is limited by the finite risetime. On the other hand, it is shown that joint TRPL and μ PL can be used to determine the diffusion constant, the bulk recombination time, and the spin relaxation time. As an illustration, the temperature variation of these quantities is investigated for p + GaAs.

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