The effect of monochromatic light throughout the visible region on the rate of decay of a persistent internal field in diamond has been studied. The persistent field was generated by spacially-separated trapped electrons and holes, and was sampled by the counting rate of the polarized diamond acting as a nuclear particle counter. Under the influence of light the internal field decayed exponentially with time in a fashion characterized by an intensity-dependent decay constant. The decay constants, normalized to a common photon flux density, varied over more than four orders of magnitude in the photon energy range from 1.8 to 3.5 eV.The results are interpreted in terms of imperfection photoconductivity arising from imperfection levels with photoionization energies of 2.5 and 3.0 eV. This photoconduction model utilizes a decay mechanism which has been overlooked in previous diamond work. An alternate conventional interpretation in terms of detrapping is also presented.
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Elmgren et al. (1962) studied this question.
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