Radiative recombination associated with a two-dimensional space charge layer in silicon |
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Authors: | F Martelli |
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Institution: | Physik-Department E16, Technische Universität München, D-8046 Garching, Federal Republic of Germany |
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Abstract: | We present photoluminescence measurements in Si-MOS structures in presence of a two-dimensional space charge layer. A unique feature is observed: the electron-hole droplet and exciton recombinations are quenched, and a new radiative recombination channel appears, in presence of an electron space charge layer at the (1 1 1) and the (1 1 0) surfaces and of a hole space charge layer in the (1 0 0) surface. The dependence of the energy of this new band on the two-dimensional carrier concentrations is given and a simple model to explain the observed features is proposed. |
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