Binary additives synergistically boost the efficiency of all-polymer solar cells up to 3.45%
Pei Cheng(Beijing National Laboratory for Molecular Sciences), Long Ye(Beijing National Laboratory for Molecular Sciences), Xingang Zhao(Institute of Chemistry), Jianhui Hou(Beijing National Laboratory for Molecular Sciences), Yongfang Li(Soochow University), Xiaowei Zhan(Beijing National Laboratory for Molecular Sciences)
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Abstract
Binary additives synergistically boost the power conversion efficiency of all-polymer solar cells up to 3.45%. The nonvolatile additive PDI-2DTT suppresses aggregation of the acceptor PPDIDTT and enhances donor/acceptor mixing, while the additive DIO facilitates aggregation and crystallization of the donor PBDTTT-C-T as well as improves phase separation. Combination of DIO and PDI-2DTT leads to suitable phase separation and improved and balanced charge transport, which is beneficial to efficiency enhancement.
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