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Abstract
Sensitization of the dopant ionization in co-deposited films of organic semiconductors was found. The ionization rate of cesium carbonate (Cs2CO3), which acts as a donor dopant in single films of metal-free phthalocyanine (H2Pc) and fullerene (C60), was increased from 10% to 97% in a H2Pc:C60 co-deposited film. A charge separation superlattice model that includes electron transfer from the conduction band of H2Pc to that of C60, which increases the rate of dopant ionization, is proposed.
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