a.Beijing National Laboratory for Molecular Sciences, Centre for the Soft Matter Science and Engineering, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
b.Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong 999077, China
hyan@ust.hk (H.Y.)
dhzhao@pku.edu.cn (D.H.Z.)
收稿:2020-01-31,
修回:2020-3-11,
录用:2020-3-13,
网络首发:2020-05-27,
纸质出版:2020-08-14
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Han, H.; Bai, F. J.; Wei, R.; Yu, H.; Guo, Y. K.; Yan, H.; Zhao, D. H. High open-circuit voltage and low voltage loss in all-polymer solar cell with a poly(coronenediimide-vinylene) acceptor. Chinese J. Polym. Sci. 2020, 38, 1157–1163
Han Han, Fu-Jin Bai, Rong Wei, et al. High Open-circuit Voltage and Low Voltage Loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene) Acceptor[J]. Chinese Journal of Polymer Science, 2020, 38(11): 1157-1163.
Han, H.; Bai, F. J.; Wei, R.; Yu, H.; Guo, Y. K.; Yan, H.; Zhao, D. H. High open-circuit voltage and low voltage loss in all-polymer solar cell with a poly(coronenediimide-vinylene) acceptor. Chinese J. Polym. Sci. 2020, 38, 1157–1163 DOI: 10.1007/s10118-020-2426-6.
Han Han, Fu-Jin Bai, Rong Wei, et al. High Open-circuit Voltage and Low Voltage Loss in All-polymer Solar Cell with a Poly(coronenediimide-vinylene) Acceptor[J]. Chinese Journal of Polymer Science, 2020, 38(11): 1157-1163. DOI: 10.1007/s10118-020-2426-6.
Reducing the voltage loss (
V
loss
) is a critical factor in optimizing the open-circuit voltage (
V
oc
) and overall power-conversion efficiency (PCE) of polymer solar cells. In the current work
by designing a novel electron-accepting unit of coronenediimide (CDI) and using it as the main functional building block
a new polymer acceptor CDI-V is developed and applied to fabricate all-polymer solar cells. Compared with the perylenediimide-based polymer acceptors we previously reported
the current CDI-V polymer possesses a noticeably elevated lowest unoccupied molecular orbital (LUMO). Thereby
by virtue of the enlarged energy gap between the donor HOMO and acceptor LUMO
a high
V
oc
value of 1.05 V is achieved by the all-polymer photovolatic device
along with an impressively low
V
loss
of 0.55 V. As remarkably
in spite of an extremely small LUMO level offset of 0.01 eV exhibited by the donor and acceptor polymers
effective charge separation still takes place in the all-polymer device
as evidenced by a proper short-circuit current (
J
sc
) of 9.5 mA·cm
−2
and a decent PCE of 4.63%.
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