

FOLLOWUS
a.The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
b.National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
c.Beijing National Laboratory for Molecular Sciences, Beijing 100190, China
d.Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou 450002, China
min.jie@whu.edu.cn
Received:14 December 2021,
Revised:2022-1-11,
Accepted:16 January 2022,
Online First:18 March 2022,
Published:01 August 2022
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Wang, T.; Sun, R.; Yang, X. R.; Wu, Y.; Wang, W.; Li, Q.; Zhang, C. F.; Min, J. A near-infrared polymer acceptor enables over 15% efficiency for all-polymer solar cells. Chinese J. Polym. Sci. 2022, 40, 877–888
Tao Wang, Rui Sun, Xin-Rong Yang, et al. A Near-Infrared Polymer Acceptor Enables over 15% Efficiency for All-Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022, 40(8): 877-888.
Wang, T.; Sun, R.; Yang, X. R.; Wu, Y.; Wang, W.; Li, Q.; Zhang, C. F.; Min, J. A near-infrared polymer acceptor enables over 15% efficiency for all-polymer solar cells. Chinese J. Polym. Sci. 2022, 40, 877–888 DOI: 10.1007/s10118-022-2697-1.
Tao Wang, Rui Sun, Xin-Rong Yang, et al. A Near-Infrared Polymer Acceptor Enables over 15% Efficiency for All-Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2022, 40(8): 877-888. DOI: 10.1007/s10118-022-2697-1.
We synthesized a new PA PYT-Tz with fused-ring benzotriazole (BTz)-based A’-DAD-A’ structure as electron-deficient-core
n-nonane as alkyl-side-chain and thiophene as π-bridge. PYT-Tz showed significantly red-shifted absorption and up-shifted LUMO level compared with PYT due to the less electron-deficient property of BTz unit
leading to a high PCE of 15.10%.
Finding effective molecular design strategies to enable efficient charge generation
high charge transport
and small energy loss is a longstanding challenge for developing high-performance all-polymer solar cells (all-PSCs). Here
we designed and synthesized a fused-aromatic-ring-constructed near-infrared (NIR) polymer acceptor (P
A
) PYT-Tz with fused-ring benzotriazole (BTz)-based A’-DAD-A’ structure as electron-deficient-core
n
-nonane as alkyl-side-chain and thiophene as
π
-bridge
and achieved a power conversion efficiency (PCE) of 15.10% for the all-PSCs with PYT-Tz as acceptor and a wide-bandgap PBDB-T as donor. A control P
A
PYT reported by our lab recently was introduced for investigating the synergistic effect of the electron-deficient-core and alkyl-side-chain on the optoelectronic properties and photovoltaic performance of the
n
-type P
A
s. Compared with PYT
the designed PYT-Tz exhibits intense and red-shifted absorption
upshifted energy levels
high electron mobility and ordered molecular packing in the active layers
and
blended with PBDB-T
yields the efficient hole injection
ultrafast charge generation
and the decreased non-radiative recombination loss of 0.17 eV. Of note is that the PCE of 15.10% is one of the highest PCE values for an all-PSC reported to date. Our results indicate BTz-based fused-aromatic-ring-constructed P
A
s are promising NIR acceptors in the all-PSCs.
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