High-performance all-polymer solar cells with only 0.47 eV energy loss

Wu Q, Wang W, Wang T, Sun R, Guo J, Wu Y, Jiao X, Brabec C, Li Y, Min J (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Science China-Chemistry Springer Verlag (Germany)

DOI: 10.1007/s11426-020-9785-7

Abstract

The field of all-polymer solar cells (all-PSCs) has experienced rapid development during the past few years, mainly driven by the development of efficient polymer acceptors. However, the power conversion efficiencies (PCEs) of the all-PSCs are still limited by insufficient light absorption of the donor/acceptor blend and large energy loss in devices. We herein designed a polymer acceptor PYT1 constructed n-type molecular acceptor Y5-C20 as the key building block and blended it with a polymer donor PM6 to obtain an all-polymer photoactive layer. The optimized PM6:PYT1 all-PSCs achieved a record higher PCE of 13.43% with a very low energy loss of 0.47 eV and a photoresponse of up to 900 nm compared with the Y5-C20 based device with a best PCE of 9.42%. Furthermore, the PCEs of the PM6:PYT1 all-PSCs are relatively insensitive to the 1-chloronaphthalene (CN) additive contents and active layer thickness. Our results also highlight the effect of CN additive on PM6:PYT1 morphology, i.e., charge generation, and transport find an optimized balance, and radiative and non-radiative loss is simultaneously reduced in the blend. This work promotes the development of high-performance polymer acceptors and heralds a brighter future of all-PSCs for commercial applications.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Wuhan University CN China (CN) Monash University AU Australia (AU) Beijing National Laboratory for Molecular Sciences CN China (CN)

How to cite

APA:

Wu, Q., Wang, W., Wang, T., Sun, R., Guo, J., Wu, Y.,... Min, J. (2020). High-performance all-polymer solar cells with only 0.47 eV energy loss. Science China-Chemistry. https://dx.doi.org/10.1007/s11426-020-9785-7

MLA:

Wu, Qiang, et al. "High-performance all-polymer solar cells with only 0.47 eV energy loss." Science China-Chemistry (2020).

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