Fan B, Du X, Liu F, Zhong W, Ying L, Xie R, Tang X, An K, Xin J, Li N, Ma W, Brabec C, Huang F, Cao Y (2018)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2018
Publisher: Nature Publishing Group
DOI: 10.1038/s41560-018-0263-4
The performance of organic photovoltaics is largely dependent on the balance of short-circuit current density (JSC) and open-circuit voltage (VOC). For instance, the reduction of the active materials’ optical bandgap, which increases the JSC, would inevitably lead to a concomitant reduction in VOC. Here, we demonstrate that careful tuning of the chemical structure of photoactive materials can enhance both JSC and VOC simultaneously. Non-fullerene organic photovoltaics based on a well-matched materials combination exhibit a certified high power conversion efficiency of 12.25% on a device area of 1 cm2. By combining Fourier-transform photocurrent spectroscopy and electroluminescence, we show the existence of a low but non-negligible charge transfer state as the possible origin of VOC loss. This study highlights that the reduction of the bandgap to improve the efficiency requires a careful materials design to minimize non-radiative VOC losses. © 2018, The Author(s), under exclusive licence to Springer Nature Limited.
APA:
Fan, B., Du, X., Liu, F., Zhong, W., Ying, L., Xie, R.,... Cao, Y. (2018). Fine-tuning of the chemical structure of photoactive materials for highly efficient organic photovoltaics. Nature Energy. https://doi.org/10.1038/s41560-018-0263-4
MLA:
Fan, Baobing, et al. "Fine-tuning of the chemical structure of photoactive materials for highly efficient organic photovoltaics." Nature Energy (2018).
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