Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 4, Pages 906-913Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00156
Keywords
same-acceptor-strategy; benzotriazole; pi-bridge; fluorine; organic solar cells
Funding
- National Key Research and Development Program of China [2017YFA0206600]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SLH033]
- National Natural Science Foundation of China (NSFC) [51473040, 51673048, 21875052]
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On the basis of the success of the Same-Acceptor-Strategy (SAS) in constructing p-type and n-type photovoltaic material combination to realize high open-circuit voltage (V-OC) beyond 1.1 V, we designed and synthesized two new benzotriazole (BTA)-based conjugated p-type polymers. PE1 was derived from the classical polymer J61 by replacing the thiophene pi-bridge with thieno[3,2-b]thiophene (TT) due to its rigid structure and the linear polymer backbone conformation, which are benificial for enhancing the effective conjugation length and intermolecular pi-pi stacking. By further introducing fluorine atoms to the thiophene side chain in PE1, the final polymer PE2 can thus realize a downshifted highest occupied molecular orbital energy level of -5.41 eV. Utilizing SAS and adopting a benzotriazole-containing small molecule BTA3 as electron acceptor, PE1 can realize a slightly improved power conversion efficiency (PCE) of 8.43% than that of J61 (8.25%) with a Voc of 1.11 V. Furthermore, PE2:BTA3 combination can attain a extremely high Voc of 1.26 V with a moderate PCE of 5.83%, which is one of the best results for organic solar cells with Voc beyond 1.2 V. Our results indicate that the incorporation of TT pi-bridge and fluorine substituents are effective to finetune the optoelectronic properties of p-type polymers to realize high V-OC and PCE, which can expand the choice of material combination for SAS.
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