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Template role of polyhexylthiophene nanowires on efficient bilayer photovoltaic cells

Rodrigues, R. ; Ferreira, Q. ; Mendonça, A. ; Morgado, J.

Synthetic Metals Vol. 190, Nº n/a, pp. 72 - 78, April, 2014.

ISSN (print): 0379-6779
ISSN (online):

Journal Impact Factor: 1,962 (in 2008)

Digital Object Identifier: 10.1016/j.synthmet.2014.01.006

Nanowires of the conjugated polymer poly(3-hexylthiophene) (P3HT) were produced by solution self-assembly and incorporated into bilayer photovoltaic devices with PCBM as the electron-acceptor material. Atomic Force Microscopy enabled a full assessment of the self-assembled P3HT fibrils network. It also revealed the effect the pre-existing nanowires have on the evaporated PCBM overlayer, strongly suggesting a master role. The power conversion efficiency of the bilayer with P3HT nanowires dramatically increases, when compared to the non-structured bilayer photovoltaic devices of P3HT. Photovoltaic devices characterization ensured a comparative overview of the performance parameters for both structured and non-structured P3HT:PCBM bilayers and blend devices.