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3 November 2004 Wide-bandgap organic photovoltaics on flexible plastic substrates using conducting polymer electrodes
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Single heterojunction and multi-heterojunction, small-molecule organic photovoltaic devices (OPVs) have been prepared on Glass/ITO and fully-flexible thermoplastic substrates using pre-patterned, conducting polymer electrodes (~ 450Ω/□). OPVs were fabricated via sequential vacuum vapor deposition of layers of the organic electron donating/hole transporting material: N,N'-(a-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (a-NPD) and the electron accepting/transporting material C60. Devices built on glass/ITO substrates operated with a maximum, white-light power conversion efficiency (ηpower) of 1.1% (AM1.5, 97 mW/cm2). Analogous devices fabricated on fully-flexible, plastic substrates using conducting polymer transparent electrodes exhibited white-light power conversion efficiencies of ~1%, virtually identical to those fabricated on prepatterned ITO/glass substrates. The glass/ITO cells were further optimized by including an exciton blocking layer of 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and their ηpowerS exhibited a 30% increase to 1.3%.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gary P. Kushto, Woohong Kim, and Zakya H. Kafafi "Wide-bandgap organic photovoltaics on flexible plastic substrates using conducting polymer electrodes", Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004);

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