Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 49, Pages 42747-42755Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b16554
Keywords
benzodithiophene; open-circuit voltage; side chain; polymer solar cells
Funding
- National Natural Science Foundation of China [21502205, 61405209, 51573205, 51773220]
- Qingdao Source Innovation Plan Applied Basic Research Project [18-2-2-28-jch]
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In this work, we have reported a highly efficient photovoltaic material, PBDTTz-SBP, by fine-tuning the side chains of the benzodithiophene (BDT) unit. With the replacement of alkoxy chains with alkylthio chains, a large increase in power conversion efficiency (PCE) was realized. Non-fullerene polymer solar cells (PSCs) without any posttreatment generate an optimal PCE of up to 12.09%, with a high V-OC of 0.914 V, J(SC) of 18.52 mA cm(-2), and fill factor of 71.43%. Notably, the efficiency of a PBDTTz-SBP-based solar cell was about 1.31-fold of the PCE (9.20%) of its counterpart based on the polymer, PBDTTz-BP, with alkoxy chains, indicating the striking modulation effect of side-chain engineering. Although V-OC and J(SC) were lower than those of non-fullerene devices, the PSCs with PC71BM as the acceptor exhibited a fairly high fill factor of up to 76.69%, affording a moderate PCE. Our work reported a highly efficient polymer solar cell with a PCE of 12.09% and clearly demonstrated the great tuning effect of alkylthio chains on photovoltaic performance.
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