Journal
CHEMICAL COMMUNICATIONS
Volume 57, Issue 72, Pages 9132-9135Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cc02706a
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Funding
- National Natural Science Foundation of China (NSFC) [21835006, 51961135103]
- Youth Innovation Promotion Association CAS [2018043]
- NSFC [21805287, 22075301]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM201903]
- National Research Foundation (NRF) of Korea [2019R1A2C2085290, 2020M3H4A3081814]
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Newly designed polymers PBTT-Cn based on carboxylate-functionalized thieno[3,2-b]thiophene units showed excellent electroluminescence external quantum efficiencies, with PBTT-C4 and C5 films having EQE(EL) over 1 x 10(-2). PBTT-C4 exhibited high EQE(EL), Vnon-radloss, leading to a high open-circuit voltage and a satisfactory PCE in PBTT-C4-based OPV cells.
Here, new polymers named PBTT-Cn (n = 3, 4, or 5) have been designed based on carboxylate-functionalized thieno[3,2-b]thiophene units. The electroluminescence external quantum efficiencies (EQE(EL)) of pristine PBTT-C4 and C5 films are over 1 x 10(-2), which are among the highest results for OPV materials. Through combination with BTP-eC9, the PBTT-C4-based film showed a high EQE(EL) of 6 x 10(-4) and the Vnon-radloss is 0.19 eV. As a result, a high open-circuit voltage of 0.89 V and a satisfactory PCE of 15% were recorded in the PBTT-C4-based OPV cells.
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