Li Yonghai, Yu Lu, Chen Liangliang, Han Chenyu, Jiang Huanxiang, Liu Zitong, Zheng Nan, Wang Jiuxing, Sun Mingliang, Yang Renqiang, Bao Xichang
CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
Functional Laboratory of Solar Energy, Shandong Energy Institute, Qingdao 266101, China.
Innovation (Camb). 2021 Feb 5;2(1):100090. doi: 10.1016/j.xinn.2021.100090. eCollection 2021 Feb 28.
To clearly show how important the impact of side chains on organic solar cells (OSCs) is, we designed three acceptors IDIC-CPh ( = 4, 5, or 6) via subtle side-chain regulation. Despite this small change, significant distinctions were detected. IDIC-C4Ph devices achieve an optimal efficiency of 13.94% under thermal annealing, but thermal-assistant solvent-vapor annealing hugely suppresses the efficiencies to 10%. However, the C6Ph side chain endows extremely disordered stacking orientations, generating moderate efficiencies of ~12.50%. Excitingly, the IDIC-C5Ph affords an unexpected two-channel π-π charge transport (TCCT) property, boosting the fill factor (FF) by up to 80.02% and efficiency to 14.56%, ranking the best among five-ring fused-ladder-type acceptors. Impressively, the special TCCT behavior of IDIC-C5Ph enables 470 nm thick-film OSC with a high FF of up to 70.12% and efficiency of 13.01%, demonstrating the great promise in fabricating large-scale OSCs.
为了清楚地展示侧链对有机太阳能电池（OSC）的影响有多重要，我们通过微调侧链设计了三种受体IDIC-CPh（ = 4、5或6）。尽管有这个小变化，但仍检测到了显著差异。IDIC-C4Ph器件在热退火下实现了13.94%的最佳效率，但热辅助溶剂蒸汽退火极大地将效率抑制到了10%。然而，C6Ph侧链赋予了极其无序的堆积取向，产生了约12.50%的中等效率。令人兴奋的是，IDIC-C5Ph具有意想不到的双通道π-π电荷传输（TCCT）特性，将填充因子（FF）提高了80.02%，效率提高到14.56%，在五环稠合梯形受体中排名最佳。令人印象深刻的是，IDIC-C5Ph的特殊TCCT行为使470nm厚膜OSC具有高达70.12%的高FF和13.01%的效率，这表明在制造大规模OSC方面具有巨大潜力。
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