Fine-tuning of the chemical structure of photoactive materials for highly efficient organic photovoltaics

Journal article
(Original article)


Publication Details

Author(s): 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
Journal: Nature energy
Publisher: Nature Publishing Group
Publication year: 2018
ISSN: 2058-7546
Language: English


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 Limited.


FAU Authors / FAU Editors

Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Du, Xiaoyan
Institute Materials for Electronics and Energy Technology (i-MEET)
Li, Ning Dr.-Ing.
Institute Materials for Electronics and Energy Technology (i-MEET)
Tang, Xiaofeng
Institute Materials for Electronics and Energy Technology (i-MEET)


External institutions
Lawrence Berkeley National Laboratory (LBNL)
Shanghai Jiao Tong University / 上海交通大学
Xi'an Jiaotong University (XJTU) / 西安交通大学


How to cite

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://dx.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).

BibTeX: 

Last updated on 2019-14-03 at 12:48