Side Chain Engineered Naphthalene Diimide-Based Terpolymer for Efficient and Mechanically Robust All-Polymer Solar Cells

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The recent evolution of new polymer acceptors (P(A)s) using small-molecule building blocks with high light absorption has significantly increased the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs), but their mechanical properties are typically poor. Thus, poly[[N,M-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)] (N2200) is still considered one of the most successful P(A)s in all-PSCs. Herein, we report the development of new naphthalene dimide-based P(A)s (NDI-P(A)s) that enable the achievement of both superior PCEs and mechanical robustness of all-PSCs compared to those of N2200-based devices. Our approach is very simple and effective for constructing a series of PAS [PNDIHD/DT-x, where x = 0-1], consisting of two NDI units with different side chains (2-hexyldecyl (HD) and 2decyltetradecyl (DT)). The PNDIHD/DT-0.41-based all-PSCs with the poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo [1,2-b: 4,5-b'] dithiophene))-alt- (5,5- (1',3'-di-2-thienyl-5',7'-bis (2-ethylhexyl)benzo [1',2'-c:4',5'-c'] dithiophene-4,8-dione))] (PBDB-T) polymer donor achieve a PCE of 9.3%, which outperforms the N2200-based device (PCE = 7.7%). This is mainly attributed to the enhanced charge generation and transport abilities of the PNDIHD/DT-0.41-based all-PSCs, as a result of optimal domain size and purity as well as high electron mobility. Importantly, the PBDB-T:PNDIHD/DT-0.41 blend shows excellent mechanical robustness, with a crack onset strain (COS) of 30% and a toughness of 7.5 MJ m(-3). In addition, a flexible polymer solar cell (FPSC) device with the PBDB-T:PNDIHD/DT-0.41 blend shows a high initial PCE of 6.73%, which is maintained over 6% even after bending 1500 times.
Publisher
AMER CHEMICAL SOC
Issue Date
2021-02
Language
English
Article Type
Article
Citation

CHEMISTRY OF MATERIALS, v.33, no.3, pp.1070 - 1081

ISSN
0897-4756
DOI
10.1021/acs.chemmater.0c04721
URI
http://hdl.handle.net/10203/281720
Appears in Collection
ME-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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