Acceptor Doped Metal-Free Phthalocyanines

Donor or Acceptor Doped Metal-Free Phthalocyanines 

Nespurek (1984) and Nespurek et al. (1985) measured photogeneration efficiencies of vapor-deposited a-H c. Samples prepared with a surface layer of an acceptor compound, pyromellitic acid dianhydride or tetracyanoquinodimethane, were also studied. In the absence of an acceptor, the efficiencies were in the range of 0.01 to 0.02 at fields of KP V/cm. Nespurek and coworkers 

In materials where the photogeneration involves the surface-enhanced dissociation of an exciton, as is generally the case for the phthalocanines, the photogeneration efficiency defined by Kanemitsu and Imamura represents the fraction of photons that create exitons that diffuse to the interface between the generation and transport layers. The injection efficiency then represents the fraction of pairs that dissociate into free electrons and free holes. The field dependence of the photogeneration efficiency was described by the Onsager theory. A primary quantum yield of 0.50 was reported. Values of the thermalization distance and the injection efficiency were not cited. 

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B. Donor or Acceptor Doped Metal-Free Phthalocyanines... 

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