Journal
ACS ENERGY LETTERS
Volume 7, Issue 9, Pages 3045-3057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c01316
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Funding
- National Natural Science Foundation of China [21971014, 61805009, 21672023]
- Thousand Youth Talents Plan of China
- BIT Teli Young Fellow Recruitment Program
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In this study, a family of polymer donors for organic solar cells (OSCs) was synthesized using a ternary copolymerization approach. The terpolymer D18-20%Cl, with an appropriate proportion of chlorinated monomer, demonstrated the best performance with improved morphology and charge transport when blended with Y6. This resulted in a top-ranked power conversion efficiency (PCE) of 18.28% for D18-20%Cl:Y6-based OSCs, the highest reported PCE for terpolymer-based binary OSCs.
Herein, by using two fluorinated and chlorinated monomers with similar structures in different molar ratios and dithieno[3',2':3,4;2 '',3 '':5,6]benzo[1,2-c][1,2,5]thiadiazole (DTBT) as the third unit, a family of polymer donors D18, D18-20%Cl, D18-40%Cl, and D18-Cl are synthesized for OSCs. With appropriate chlorinated monomer proportion, the terpolymer D18-20%Cl exhibits proper HOMO energy level and higher packing density compared with that of other control polymers. Moreover, the D18-20%Cl:Y6 blend films have favorable morphology with better face-on crystallization and better charge transport. Consequently, the D18-20%Cl:Y6-based OSCs obtain a top-ranked PCE of 18.28% with overall improved device parameters compared to the controlled D18:Y6 or D18-Cl:Y6-based OSCs (17.50% or 17.02%), which represents the highest PCE for the reported terpolymer-based binary OSCs. Notably, the D18-20%Cl:Y6-based OSCs exhibit over 17% efficiency in a wide molecular weight range. These results demonstrate that the ternary copolymerization of DTBT and two similar moieties is an efficient approach for achieving efficient terpolymer donors with well batch-to-batch reproducibility.
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