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DOE OSTI · 2422622

19.28% Efficiency and Stable Polymer Solar Cells Enabled by Introducing an NIR–Absorbing Guest Acceptor

Fan, Qunping·Ma, Ruijie·Bi, Zhaozhao·Liao, Xunfan·Wu, Baohua·Zhang, Sen·Su, Wenyan·Fang, Jin·Zhao, Chao·Yan, Cenqi·Chen, Kai·Li, Yuxiang·Gao, Chao·Li, Gang·Ma, Wei
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Abstract

Here, a near-infrared (NIR)-absorbing small-molecule acceptor (SMA) Y-SeNF with strong intermolecular interaction and crystallinity is developed by combining selenophene-fused core with naphthalene-containing end-group, and then as a custom-tailor guest acceptor is incorporated into the binary PM6:L8-BO host system. Y-SeNF shows a 65 nm red-shifted absorption compared to L8-BO. Thanks to the strong crystallinity and intermolecular interaction of Y-SeNF, the morphology of PM6:L8-BO:Y-SeNF can be precisely regulated by introducing Y-SeNF, achieving improved charge-transporting and suppressed non-radiative energy loss. Consequently, ternary polymer solar cells (PSCs) offer an impressive device efficiency of 19.28% with both high photovoltage (0.873 V) and photocurrent (27.88 mA cm –2 ), which is one of the highest efficiencies in reported single-junction PSCs. Notably, ternary PSC has excellent stability under maximum-power-point tracking for even over 200 h, which is better than its parental binary devices. The study provides a novel strategy to construct NIR-absorbing SMA for efficient and stable PSCs toward practical applications.

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14 SOLAR ENERGY36 MATERIALS SCIENCEChemistryMaterials SciencePhysicsScience & Technology - Other Topicscustom-tailor guest acceptorspolymer solar cellspower conversion efficiencystabilityternary

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Fan, Qunping, Ma, Ruijie, Bi, Zhaozhao, Liao, Xunfan, Wu, Baohua, Zhang, Sen, Su, Wenyan, Fang, Jin, Zhao, Chao, Yan, Cenqi, Chen, Kai, Li, Yuxiang, Gao, Chao, Li, Gang, Ma, Wei. 2023-01-06. 19.28% Efficiency and Stable Polymer Solar Cells Enabled by Introducing an NIR–Absorbing Guest Acceptor. https://doi.org/10.1002/adfm.202211385

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