A study i spresented on minority carrier transport parameters, in particular mobility-lifetime products, in naturla and CVD diamond materials with different morpholigy. #mu##tau# products are obtained by photocurrent versus field measurements and their values range between 101~(-8)-10~(-5)cm~2 V~(-1) depending on grain size and orientation. Observed variations are mainly related to mobility changes, while minority carrier lifetimes are almost constant around 10~(-10)-10~(-9)s. The origin of such a behaviour is analysed in terms of gap state distribution arising from structural defects, impurities and non-diamond microphases.
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