B—N–Bond–Embedded Triplet Terpolymers with Small Singlet–Triplet Energy Gaps for Suppressing Non–Radiative Recombination and Improving Blend Morphology in Organic Solar Cells

Pang, Bo; Liao, Chentong; Xu, Xiaopeng; Peng, Shaoqian; Xia, Jianlong; Guo, Yuanyuan; Xie, Yuan; Chen, Yuting; Duan, Chunhui; Wu, Hongbin; Li, Ruipeng; Peng, Qiang

doi:10.1002/adma.202211871

B—N–Bond–Embedded Triplet Terpolymers with Small Singlet–Triplet Energy Gaps for Suppressing Non–Radiative Recombination and Improving Blend Morphology in Organic Solar Cells

Journal Article · Thu Feb 02 00:00:00 EST 2023 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202211871· OSTI ID:2440560

Pang, Bo ^[1]; Liao, Chentong ^[1]; Xu, Xiaopeng ^[1]; Peng, Shaoqian ^[2]; Xia, Jianlong ^[2]; Guo, Yuanyuan ^[3]; Xie, Yuan ^[4]; Chen, Yuting ^[4]; Duan, Chunhui ^[4]; Wu, Hongbin ^[4]; Li, Ruipeng ^[5]; ^[1]

Sichuan Univ., Chengdu (China)
Wuhan Univ. of Technology (China)
Nanyang Technological Univ. (Singapore)
South China Univ. of Technology (SCUT), Guangzhou (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Suppressing the photon energy loss (E_loss), especially the non-radiative loss, is of importance to further improve the device performance of organic solar cells (OSCs). However, typical π-conjugated semiconductors possess a large singlet–triplet energy gap (ΔE_ST), leading to a lower triplet state than charge transfer state and contributing to a non-radiative loss channel of the photocurrent by the triplet state. Herein, a series of triplet polymer donors are developed by introducing a BNIDT block into the PM6 polymer backbone. Further, the high electron affinity of BNIDT and the opposite resonance effect of the B—N bond in BNIDT results in a lowered highest occupied molecular orbital (HOMO) and a largely reduced ΔE_ST. Moreover, the morphology of the active blends is also optimized by fine-tuning the BNIDT content. Therefore, non-radiative recombination via the terminal triplet loss channels and morphology traps is effectively suppressed. The PNB-3 (with 3% BNIDT):L8-BO device exhibits both small ΔE_ST and optimized morphology, favoring more efficient charge transfer and transport. Finally, the simultaneously enhanced V_oc of 0.907 V, J_sc of 26.59 mA cm^–2, and FF of 78.86% contribute to a champion PCE of 19.02%. Therefore, introducing B—N bonds into benchmark polymers is a possible avenue toward higher-performance of OSCs.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2440560

Report Number(s):: BNL--226001-2024-JAAM

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 17 Vol. 35; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
B-N bonds
non-radiative recombination
organic solar cells
singlet-triplet energy gap
triplet terpolymers

B—N–Bond–Embedded Triplet Terpolymers with Small Singlet–Triplet Energy Gaps for Suppressing Non–Radiative Recombination and Improving Blend Morphology in Organic Solar Cells

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