Sun, R.,Wang, W.,Yu, H.,Chen, Z.,Xia, XX.,Shen, H.,Guo, J., … Min, J. (2021).Achieving over 17% efficiency of ternary all-polymer solar cells with two well-compatible polymer acceptors.Joule.(闵杰)

Abstract

The field of all-polymer solar cells (all-PSCs) has experienced rapid development during the past few years, mainly driven by the design of efficient polymer acceptors (P(A)s). However, the polymer/polymer blend systems still lag far behind polymer/small molecule acceptor counterparts in power conversion efficiencies (PCEs). Here, we designed a near-infrared P-A PY2F-T and paired it with polymer donor PM6 to fabricate all-PSCs with 15.0% PCE. Afterwards, PYT as the third component was introduced into the PM6: PY2F-T host system. Because of the complementary absorption bands and finely tuned microstructures of the ternary blend, the PCE is improved up to 17.2%, with the external quantum efficiency over 80% in visible and near-infrared spectral regions. Impressively, the ternary blend exhibited less energy loss, better light- soaking and photo-thermal stabilities than did the corresponding binary systems. This work promotes the development of high-performance ternary all-polymer systems and heralds a brighter future for accelerating the possible applications of all-PSCs.

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https://www.sciencedirect.com/science/article/pii/S2542435121001938?via%3Dihub