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As‐Cast Ternary Organic Solar Cells Based on an Asymmetric Side‐Chains Featured Acceptor with Reduced Voltage Loss and 14.0% Efficiency
Author(s) -
Chen Xuebin,
Kan Bin,
Kan Yuanyuan,
Zhang Ming,
Jo Sae Byeok,
Gao Ke,
Lin Francis,
Liu Feng,
Peng Xiaobin,
Cao Yong,
Jen Alex K.Y.
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201909535
Subject(s) - materials science , ternary operation , acceptor , side chain , alkoxy group , organic solar cell , energy conversion efficiency , homo/lumo , intermolecular force , polymer , molecule , crystallography , optoelectronics , organic chemistry , alkyl , composite material , chemistry , physics , computer science , programming language , condensed matter physics
A new small‐molecule nonfullerene acceptor based on the benzo[1,2‐ b :4,5‐ b ′]dithiophene (BDT) fused central core with asymmetrical alkoxy and thienyl side chains, namely TOBDT , is designed and synthesized. The alkoxy unit helps narrow the bandgap, and thienyl side chain helps enhance the intermolecular interaction. As a result, TOBDT is suitable to match the deep‐lying highest occupied molecular orbital (HOMO) of polymer donor PM6 . Then, a strong crystalline acceptor IDIC is introduced as the third component to fabricate as‐cast nonfullerene ternary devices to achieve absorption and morphology control. Addition of IDIC not only mixes well with TOBDT but modulates the morphology of the blend film, which helps to balance the charge transport properties and reduce the photovoltage loss of ternary devices. All these contribute to synergetic improvement of J sc , V oc , and fill factor parameters, leading to a power conversion efficiency of 14.0% for the as‐cast fullerene‐free ternary device.