Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 1, Pages 753-762Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b18048
Keywords
organic solar cells; energy loss; pi-spacer; thiazole; isomeric polymers
Funding
- Ministry of Science and Technology of China [2017YFA0206600]
- National Natural Science Foundation of China [21875072, 21520102006]
- Fundamental Research Funds for the Central Universities
- Peiyang Scholar Program of Tianjin University
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Large energy loss is one of the key factors that limit the power conversion efficiency (PCE) of organic solar cells (OSCs). In this work, we report reduced energy losses of OSCs via introducing thiazole pi-spacers with different orientations to replace the thiophene pi-spacers of the prototype polymer PBDB-T. The newly formed thiazole-containing isomeric polymers, PBDBTz-2 and PBDBTz-5, exhibited blue-shifted absorption and deeper lying energy levels compared to PBDB-T. When blended with IT-4F, the two polymers realized PCEs of 10.4% for PBDBTz-2 and 9.6% for PBDBTz-5, respectively, which were higher than that of PBDB-T (PCE = 9.3%). More critically, considerable open-circuit voltage (V-oc) enhancements were achieved by PBDBTz-2 and PBDBTz-S, which were 0.14 and 0.21 V higher than that of PBDB-T. A detailed analysis showed that the reduced energy loss resulted from the lower radiative recombination below the band gap and nonradiative recombination loss. This study demonstrated that the introduction of thiazole pi-spacers with different orientations is effective to reduce the energy losses of OSCs, which provided valuable inspirations for the development of new conjugated polymers to the efficiency breakthrough of OSCs in future.
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