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It has been shown theoretically that strong quantum confinement regime in Sinanocrystals promotes the highly efficient simultaneous excitation of twoelectron-hole pairs (biexciton) by a single photon. The rate (inverse lifetime)of biexciton generation has been calculated analytically as function of thenanocrystal radius. In contrast to the case of a nanocrystal formed ofdirect-band-gap semiconductor, the size-dependence of the rate in Sinanocrystal turns out to be sharp enough. At radii approaching a nanometer, thelifetime of biexciton generation falls into the nanosecond range.

Direct biexciton generation in Si nanocrystal by a single photon