Evidence of type-I direct recombination in InP/GaP quantum dots via magnetoluminescence

Dewitz, C. v.; Hatami, F.; Millot, M.; Broto, J. M.; Léotin, J.; Masselink, W. T.
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p151105
Academic Journal
Photoluminescence from InP quantum dots within a GaP matrix is investigated as a function of magnetic field. By fitting the magnetoluminescence data to the energy states of the electrons and holes confined in quantum dots in a perpendicular magnetic field, the electron-hole reduced effective mass is determined to be 0.094m0. The diamagnetic shift in the luminescence peak gives an average exciton radius of about 5 nm, smaller than the dot radius. These results indicate that the recombining electrons are primarily composed of states originating from the InP Γ valley although the conduction band discontinuity between the InP and the GaP barrier is expected to be very small or even negative.


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