Abstract
Bulk heterojunction organic solar cells with four different Urbach’s tail width energies ( $${E}_{U}$$ ) are simulated, and the combined influence of $${E}_{U}$$ and charge carrier mobility on the short circuit current ( $${J}_{sc})$$ , open circuit voltage ( $${V}_{oc})$$ , fill factor (FF), power conversion efficiency (PCE), Langevin and tail state recombination is investigated. The results show that $${J}_{sc}$$ decreases more drastically with increasing $${E}_{U}$$ in the lower mobility range and then asymptotically converges to a single value in the large mobility range. Likewise, with the increase in mobility, $${V}_{oc}$$ decreases nearly linearly with different slopes depending on different $${E}_{U}$$ in the lower mobility range and then different slopes converge to a single slope in the larger mobility range. Thus, $${V}_{oc}$$ becomes $${E}_{U}$$ independent in the higher mobility range. Furthermore, it is found that by increasing $${E}_{U}$$ , the maximum values of FF and PCE shift towards the higher mobility range. It is shown that the influence of combined optimization of $${E}_{U}$$ and mobility enhances both FF and PCE, but its effect on FF is much more significant than that on PCE.
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More From: Journal of Materials Science: Materials in Electronics
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