A combined theoretical and experimental investigation on the transient photovoltage in organic photovoltaic cells

Yao Yao; Xiaoyu Sun; Baofu Ding; De-Li Li; Xiaoyuan Hou; Chang-Qin Wu
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p203306
Academic Journal
We present a time-dependent device model, describing the dynamical processes of both exciton induced by light illumination and charge carriers created from the exciton dissociation, to calculate the transient photovoltage (TPV) in single-layer organic photovoltaic cells. With reasonable parameters for the specific ITO (indium tin oxide)/CuPc (copper phthalocyanine)/Al (aluminum) structure, we could obtain the TPV well fitted with previous experimental observation by adjusting only the intensity of input laser pulse. Further, we saw a saturation of this TPV by changing the intensity of laser pulse from the calculation, which has been confirmed by the experimental measurement on ITO/NPB [N,N-bis(l-naphthyl)-N,N-diphenyl-1,l-biphentl-4,4-diamine]/Al structure. The saturated TPV value is found to be sensitive to the mobility of minority carriers, which might be useful in the estimation of mobilities.


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