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

概要

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The effect of active layer thickness has been investigated on open circuit voltage ($V_{\text{oc}}$) in bilayer organic photovoltaic (OPV) devices. $V_{\text{oc}}$ 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 ($V_{\text{bi}}$) with the active layer thickness. The nonlinear variation of $V_{\text{oc}}$ with active layer thickness has been attributed to the variation of $V_{\text{bi}}$ in the samples. The investigations reported here suggest that $V_{\text{bi}}$ controls the $V_{\text{oc}}$ in OPV devices.
2009-12-25