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Photocurrent efficiency enhancement by space-charge effects in organic solar cells with low charge dissociation probability

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Abstract

We numerically investigated space-charge effects in organic solar cells generating photocurrent with a low charge dissociation probability, using a drift-diffusion model with the Onsager-Braun model. In contrast to the knowledge that spacecharge effects decrease the photocurrent efficiency, we found that under certain circumstances, the efficiency can be enhanced by the space-charge effects. It is attributed to the increase of the charge dissociation probability spatially averaged in the active layer. Space-charge effects become more significant when mobilities are unbalanced leading to more enhancement in photocurrent efficiency.

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Authors and Affiliations

  1. Department of Electronic Materials Engineering, Kwangwoon University, Seoul, 139-701, Korea

    Sangcheol Yoon & Inchan Hwang

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  1. Sangcheol Yoon
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  2. Inchan Hwang
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Correspondence to Inchan Hwang.

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Yoon, S., Hwang, I. Photocurrent efficiency enhancement by space-charge effects in organic solar cells with low charge dissociation probability. Electron. Mater. Lett. 11, 41–45 (2015). https://doi.org/10.1007/s13391-014-4248-6

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  • DOI: https://doi.org/10.1007/s13391-014-4248-6

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