Thin films composed of polycyclohexane (PCHE), zinc(II)-5,10,15,20-tetra-(2-naphthyl)porphyrin (ZnTNpP), and [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) blends are prepared to investigate their potential for the controlled selfassembly of a porphyrin/fullerene donor-acceptor complex in a polymer thin film. The compatibilities of PCHE/PCBM (p), PCHE/ZnTNpP (q), and ZnTNpP/PCBM (r) in these blends have a significant effect on the dispersion of the ZnTNpP/PCBM donor-acceptor complex in the PCHE thin film. When the compatibilities are p << q, r, and q r, the ZnTNpP/PCBM donor-acceptor complex is formed between the PCHE and PCBM phases. This concept to form a controlled self-assembly of the ZnTNpP/PCBM donor-acceptor complex may be applied to various combinations of porphyrin/fullerene systems in polymer thin film solar cells to achieve excellent performance.

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Thin films composed of semiconducting polymers [poly(2-vinyl naphthalene), poly(4-diphenyl aminostyrene), poly(1-vinyl pyrene), and poly(3-hexyl thiophene-2,5-diyl)], zinc(II)25,10,15,20-tetra-(2-naphthyl)porphyrin, and [6,6]-phenyl-C 61butyric acid methyl ester blends were prepared to investigate the controlled dispersion of porphyrin molecules in semiconducting polymer thin films. Tailoring the intermolecular interactions between the polymer/fullerene, polymer/porphyrin, and porphyrin/fullerene systems was found to be an effective method of controlling the dispersion. When the polymer/porphyrin interactions were enhanced, intermixed porphyrin/fullerene donor-acceptor complex domains were formed, whereas under conditions where the polymer/porphyrin interactions were weakened, the complex assembled at the borders between the polymer and fullerene phases. This concept could potentially be applied to various combinations of porphyrin/fullerene systems in semiconducting polymer thin films to develop polymer solar cells with excellent performance.

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