Highly Efficient Ternary Solar Cells with Efficient Förster Resonance Energy Transfer for Simultaneously Enhanced Photovoltaic Parameters

Xiao, Liangang; Wu, Xing; Ren, Guoxing; Kolaczkowski, Matthew A.; Huang, Guang; Tan, Wanyi; Ma, Lin; Liu, Yidong; Peng, Xiaobin; Min, Yonggang; Liu, Yi

doi:10.1002/adfm.202105304

Highly Efficient Ternary Solar Cells with Efficient Förster Resonance Energy Transfer for Simultaneously Enhanced Photovoltaic Parameters

Journal Article · Mon Jul 19 00:00:00 EDT 2021 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202105304· OSTI ID:1834362

Xiao, Liangang ^[1]; Wu, Xing ^[1]; Ren, Guoxing ^[1]; Kolaczkowski, Matthew A. ^[2]; Huang, Guang ^[1]; Tan, Wanyi ^[1]; Ma, Lin ^[1]; Liu, Yidong ^[1]; Peng, Xiaobin ^[3]; Min, Yonggang ^[1]; ^[2]

Guangdong University of Technology, Guangzhou (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
South China Univ. of Technology (SCUT), Guangzhou (China)

Introducing a third component into organic bulk heterojunction solar cells has become an effective strategy to improve photovoltaic performance. Meanwhile, the rapid development of non-fullerene acceptors (NFAs) has pushed the power conversion efficiency (PCE) of organic solar cells (OSCs) to a higher standard. In this study, a series of fullerene-free ternary solar cells are fabricated based on a wide bandgap acceptor, IDTT-M, together with a wide bandgap donor polymer PM6 and a narrow bandgap NFA Y6. Insights from the morphological and electronic characterizations reveal that IDTT-M has been incorporated into Y6 domains without disrupting its molecular packing and sacrificing its electron mobility and work synergistically with Y6 to regulate the packing pattern of PM6, leading to enhanced hole mobility and suppressed recombination. IDTT-M further functions as an energy-level mediator that increases open-circuit voltage (V_OC) in ternary devices. In addition, efficient Förster resonance energy transfer (FRET) between IDTT-M and Y6 provides a non-radiative pathway for facilitating exciton dissociation and charge collection. As a result, the optimized ternary device features a significantly improved PCE up to 16.63% with simultaneously enhanced short-circuit current (J_SC), V_OC, and fill factor (FF).

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Guangdong Innovative and Entrepreneurial Research Team Program; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1834362

Alternate ID(s):: OSTI ID: 1808617

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 41 Vol. 31; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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