Photoconductivity in the visible region has been studied in diamond films (DF) grown by the chemical vapor deposition process. It was found that the photocurrent increased linearly with the external bias voltage within the experimental range (30 V). Moreover, by exposing both boron-doped and undoped DF samples in air mass 1 (AM1) condition, the photocurrent produced by the former was approximately an order higher than that by the latter.
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Jeng et al. (1991) studied this question.
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