Decreasing exciton dissociation rates for reduced voltage losses in organic solar cells

Hongbo Wu, Hao Lu, Yungui Li, Xin Zhou, Guanqing Zhou, Hailin Pan, Hanyu Wu, Xunda Feng, Feng Liu, Koen Vandewal, Wolfgang Tress, Zaifei Ma (), Zhishan Bo () and Zheng Tang ()
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Hongbo Wu: Donghua University
Hao Lu: Beijing Normal University
Yungui Li: Max Planck Institute for Polymer Research
Xin Zhou: Max Planck Institute for Polymer Research
Guanqing Zhou: Shanghai Jiao Tong University
Hailin Pan: Donghua University
Hanyu Wu: Donghua University
Xunda Feng: Donghua University
Feng Liu: Shanghai Jiao Tong University
Koen Vandewal: Hasselt University
Wolfgang Tress: Zurich University of Applied Sciences
Zaifei Ma: Donghua University
Zhishan Bo: Beijing Normal University
Zheng Tang: Donghua University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Enhancing the device electroluminescence quantum efficiency (EQEEL) is a critical factor in mitigating non-radiative voltage losses (VNR) and further improving the performance of organic solar cells (OSCs). While the common understanding attributes EQEEL in OSCs to the dynamics of charge transfer (CT) states, persistent efforts to manipulate these decay dynamics have yielded limited results, with the EQEEL of high-efficiency OSCs typically remaining below 10−2%. This value is considerably lower than that observed in high efficiency inorganic photovoltaic devices. Here, we report that EQEEL is also influenced by the dissociation rate constant of singlet states (kDS). Importantly, in contrast to the traditional belief that advocates maximizing kDS for superior photovoltaic quantum efficiency (EQEPV), a controlled reduction in kDS is shown to enhance EQEEL without compromising EQEPV. Consequently, a promising experimental approach to address the VNR challenge is proposed, resulting in a significant improvement in the performance of OSCs.

Date: 2024
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DOI: 10.1038/s41467-024-46797-5

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