journal article·2021-10-08

Understanding the Charge Transfer State and Energy Loss Trade-offs in Non-fullerene-Based Organic Solar Cells

Top Archie Dela Peña, Jafar I. Khan, Neha Chaturvedi, Ruijie Ma, Zengshan Xing, Julien Gorenflot, Anirudh Sharma, Fai Lun Ng, Derya Baran, He Yan, Frédéric Laquai, Kam Sing Wong

ACS Energy Letters· Volume 6· Issue 10
Publisher page

Abstract

Energy losses significantly reduce the open-circuit voltage among current state-of-the-art organic solar cells (OSCs), which limits the further enhancement of their power conversion efficiencies (PCEs). In this study, the bulk heterojunction blends of PM6 donor and halogenated nonfullerene acceptors (NFAs) display a trade-off between radiative energy losses, i.e., charge transfer state (CTS) radiative energy loss (ΔErad) and the loss associated with CTS formation from acceptor singlet excitons (ΔECTEL). Similarly, a trade-off between ΔErad and the nonradiative energy loss (ΔEnr) is found, reflecting a competition in radiative and nonradiative charge recombination pathways. Further, the energy levels of relaxed CTS (ECTEL) are shown to exhibit dependence on morphologically induced energetic traps, suggesting that it should not be associated merely to blend constituents. Interestingly, these correlations extend even to thermally degraded devices considered herein. Accordingly, this work provides further understandings of energy losses relevant to overcome the current limitations concerning NFA-based OSC developments.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China

King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), 23955-6900 Thuwal, Kingdom of Saudi Arabia

Department of Chemistry, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China

Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology (HKUST), 000000 Kowloon, Hong Kong, P.R. China

Funding

King Abdullah University of Science and Technology · Hong Kong Research Grants Council · William Mong Institute of Nano Science and Technology

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