Carrier Generation, Recombination, and Transport in Organic Crystals

摘要

Various mechanisms of carrier generation in organic crystals are reviewed. These include band-to-band transitions, auto-ionization, and direct charge-pair generation. Geminate recombination is discussed, including the effect of temperature and electric field on the initial charge distribution. Carrier transport is reviewed, using crucial experimental results. An analysis of various transport mechanisms is presented, including one that may be relevant. Three processes that are of major importance in the phenomenon of photoconductivity are carrier generation, carrier recombination, and carrier transport. These will be discussed in that order, as they relate to homomolecular polycyclic aromatic hydrocarbon (PAH) crystals. It is surprising that the mechanisms of carrier generation and carrier transport in well-characterized crystalline compounds are still subjects for heated dispute.