Nanostructure of the Interpenetrating Networks in Poly(3-hexylthiophene)/fullerene Bulk Heterojunction Materials: Implications for Charge Transport


  • We thank Professor Philip Pincus for making this collaboration possible and for important discussions. The research was supported by a grant from Konarka Technologies and by the Air Force Office of Scientific Research (AFOSR), Charles Lee, Program Officer.


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The fractal dimension, chemical distance, and finally the effect of an applied electric field on the transport within the interpenetrating network of poly(3-hexylthiophene)/fullerene bulk heterojunction materials are calculated. According to simulations, charge carriers travel along a pathway ~4 times longer than the regular Euclidean distance. In an applied electric field, the drift speed of charged carriers is reduced because of field-induced trapping on the tortuous network.