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Current-voltage (I-V) characteristics of planar heterojunction organic photovoltaic cells based on N′,N′-Di-[(1-naphthyl)-N′,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine (NPB) and C60 are investigated. Through variation of the layer thickness and composition, specifically chemical doping NPB with MoOx, we show that the hole-transport limitation in the NPB layer is the determining factor in shaping the I-V characteristics of NPB/C60 cells.
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Zhang et al. (2011) studied this question.
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