Effect of Active Layer Thickness on Open Circuit Voltage in Organic Photovoltaic Devices

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The effect of active layer thickness has been investigated on open circuit voltage (Voc) in bilayer organic photovoltaic (OPV) devices. Voc has been found to vary nonlinearly with the active layer thickness even with the same donor/acceptor materials. We present a model which gives a nonlinear variation of built-in voltage (Vbi) with the active layer thickness. The nonlinear variation of Voc with active layer thickness has been attributed to the variation of Vbi in the samples. The investigations reported here suggest that Vbi controls the Voc in OPV devices.