Fast charge separation in a non-fullerene organic solar cell with a small driving force

Jing Liu, Shangshang Chen, Deping Qian, Bhoj Gautam, Guofang Yang, Jingbo Zhao, Jonas Bergqvist, Fengling Zhang, Wei Ma, Harald Ade, Olle Inganäs, Kenan Gundogdu (), Feng Gao () and He Yan ()
Additional contact information
Jing Liu: The Hong Kong University of Science and Technology
Shangshang Chen: The Hong Kong University of Science and Technology
Deping Qian: Linköping University
Bhoj Gautam: North Carolina State University
Guofang Yang: The Hong Kong University of Science and Technology
Jingbo Zhao: The Hong Kong University of Science and Technology
Jonas Bergqvist: Linköping University
Fengling Zhang: Linköping University
Wei Ma: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Harald Ade: North Carolina State University
Olle Inganäs: Linköping University
Kenan Gundogdu: North Carolina State University
Feng Gao: Linköping University
He Yan: The Hong Kong University of Science and Technology

Nature Energy, 2016, vol. 1, issue 7, 1-7

Abstract: Abstract Fast and efficient charge separation is essential to achieve high power conversion efficiency in organic solar cells (OSCs). In state-of-the-art OSCs, this is usually achieved by a significant driving force, defined as the offset between the bandgap (Egap) of the donor/acceptor materials and the energy of the charge transfer (CT) state (ECT), which is typically greater than 0.3 eV. The large driving force causes a relatively large voltage loss that hinders performance. Here, we report non-fullerene OSCs that exhibit ultrafast and efficient charge separation despite a negligible driving force, as ECT is nearly identical to Egap. Moreover, the small driving force is found to have minimal detrimental effects on charge transfer dynamics of the OSCs. We demonstrate a non-fullerene OSC with 9.5% efficiency and nearly 90% internal quantum efficiency despite a low voltage loss of 0.61 V. This creates a path towards highly efficient OSCs with a low voltage loss.

Date: 2016
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DOI: 10.1038/nenergy.2016.89

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