The effect of morphology on the photovoltaic properties of titanyl phthalocyanine (TiOPc) has been studied. pn-Heterojunction devices consisting of TiOPc with different morphologies and N,N'-dimethyl-3,4:9,10-perylenebis(dicarboximide) (MPCI) sandwiched between indium tin oxide (ITO) and Au electrodes were fabricated. Cells fabricated using crystalline α-TiOPc film as the p-type semiconductor exhibit much higher conversion efficiency upon irradiation with light which is mainly absorbed by TiOPc than devices fabricated using amorphous TiOPc film.
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Tsuzuki et al. (1996) studied this question.
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