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@article{faucris.206433446,
abstract = {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 Limite},
author = {Fan, Baobing and Du, Xiaoyan and Liu, Feng and Zhong, Wenkai and Ying, Lei and Xie, Ruihao and Tang, Xiaofeng and An, Kang and Xin, Jingming and Li, Ning and Ma, Wei and Brabec, Christoph and Huang, Fei and Cao, Yong},
doi = {10.1038/s41560-018-0263-4},
faupublication = {yes},
journal = {Nature Energy},
keywords = {Active material; Charge transfer state; Concomitant reduction; High power conversion; Materials design; Organic photovoltaics; Photoactive materials; Photocurrent spectroscopy},
peerreviewed = {Yes},
title = {{Fine}-tuning of the chemical structure of photoactive materials for highly efficient organic photovoltaics},
year = {2018}
}