Abstract
Spin-dependent photoconductivity in semiconductors results from angular momentum conservation during the recombination of injected carriers. A model, based on the existence of trapped election-hole pairs, predicts a strong correlation between the spins of the recombining pairs, a “pumping” of triplet spin-states being produced by the allowed recombination of the singlet pairs. This effect not only provides a very sensitive method of resonant spectroscopy for the study of recombination centers, but also explains a magnetic field variation of photoconductivity as large as a few percent at room temperature, as well as a very low field magnetoresistence effect which both have been observed in thin films of hydrogenated amorphous silicon.
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