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A simple variational calculation is presented for the ground-state energy of an electron-hole system confined in a microcrystal with finite potential barriers. It is shown that the effect of the penetration of the wave function outside the microcrystal is quite large in the strong-confinement region and is consistent with the relatively small blueshift of the excitation energy observed in CdS microcrystals.
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Kayanuma et al. (1990) studied this question.
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