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Combined xerographic measurements and a delayed-collection field technique have been applied to a-Si:H. to determine whether geminate recombination controls the photogeneration process in a-Si:H. The delayed-collection field method allows the photogeneration efficiency at low applied fields to be measured. The results show that, depending on sample preparation, the zero-field quantum efficiency ranges from 0.44 to 0.55. The measured field dependence of the quantum efficiency give best fits to the Onsager theory with r0  ∼45 to 80 Å for Φ0=1.