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Under open-circuit condition, the current is not extracted and thephotogenerated carriers in principle disappear only by recombination. We studythe open-circuit voltage $V_{\rm OC}$ and transient photovoltage under theeffect of bulk recombination in a medium with energetic disorder by using themultiple trapping (MT) model. The key parameter in the MT model is thedispersion parameter $\alpha$ given by the ratio of thermal energy to thecharacteristic energy of trap states. We show that $V_{\rm OC}$ dependslinearly on the logarithm of the light intensity and the slope depends on the$\alpha$ of the MT model. Under the continuous irradiation of light, thephotovoltage response to the weak perturbation by a pulsed light obeyspseudo-first-order decay. The rate as a function of $V_{\rm OC}$ is independentof the dispersion parameter. However, it obeys the power law as a function oflight intensity, and the exponent is given by $1/(1+\alpha)$, which reduces to1/2 in the absence of energetic disorder.

Effect of Energetic Disorder on the Open-Circuit Voltage in Organic Bulk Heterojunction Composites