Fused Tris(thienothiophene)‐Based Electron Acceptor with Strong Near‐Infrared Absorption for High‐Performance As‐Cast Solar Cells

Li, Tengfei; Dai, Shuixing; Ke, Zhifan; Yang, Langxuan; Wang, Jiayu; Yan, Cenqi; Ma, Wei; Zhan, Xiaowei

doi:10.1002/adma.201705969

Title: Fused Tris(thienothiophene)‐Based Electron Acceptor with Strong Near‐Infrared Absorption for High‐Performance As‐Cast Solar Cells

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201705969· OSTI ID:1417000

Li, Tengfei ^[1]; Dai, Shuixing ^[1]; Ke, Zhifan ^[2]; Yang, Langxuan ^[1]; Wang, Jiayu ^[1]; Yan, Cenqi ^[1]; Ma, Wei ^[2];

^[1]

Department of Materials Science and Engineering College of Engineering Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing 100871 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China

Abstract A fused tris(thienothiophene) (3TT) building block is designed and synthesized with strong electron‐donating and molecular packing properties, where three thienothiophene units are condensed with two cyclopentadienyl rings. Based on 3TT, a fused octacylic electron acceptor (FOIC) is designed and synthesized, using strong electron‐withdrawing 2‐(5/6‐fluoro‐3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene)‐malononitrile as end groups. FOIC exhibits absorption in 600–950 nm region peaked at 836 nm with extinction coefficient of up to 2 × 10 ⁵ m ^–1 cm ^–1 , low bandgap of 1.32 eV, and high electron mobility of 1.2 × 10 ^–3 cm ² V ^–1 s ^–1 . Compared with its counterpart ITIC3 based on indacenothienothiophene core, FOIC exhibits significantly upshifted highest occupied molecular orbital level, slightly downshifted lowest unoccupied molecular orbital level, significantly redshifted absorption, and higher mobility. The as‐cast organic solar cells (OSCs) based on blends of PTB7‐Th donor and FOIC acceptor without additional treatments exhibit power conversion efficiencies (PCEs) as high as 12.0%, which is much higher than that of PTB7‐Th: ITIC3 (8.09%). The as‐cast semitransparent OSCs based on the same blends show PCEs of up to 10.3% with an average visible transmittance of 37.4%.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1417000

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Vol. 30 Journal Issue: 10; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 314 works

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