期刊
RSC ADVANCES
卷 12, 期 28, 页码 17682-17688出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra02608b
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- Van Lang University, Vietnam
The structure-property relationships of two different donor-acceptor copolymers were investigated, showing low bandgap and deep HOMO energy level. The photovoltaic properties of the copolymers in combination with fullerene derivatives were found to be improved.
Two kinds of donor-acceptor pi-conjugated copolymer based on poly{[N-hexyl-dithieno(3,2-b:2 ',3 '-d)pyrrole-2,6-diyl]alt-[isoindigo]} (PDTP-IID) and poly{[N-hexyl-dithieno(3,2-b:2 ',3 '-d)pyrrole-2,6-diyl]alt-[thiazol-2,5-diyl]} (PDTP-Thz) were investigated. These copolymers were synthesized via a Stille coupling reaction. The results showed the structure-property relationships of different donor-acceptor (D-A) combinations. The polymer structures and photophysical properties were characterized by H-1 NMR, TGA, DSC, UV-vis absorption spectroscopy, AFM, CV, and XRD measurement. Through UV-vis absorption and cyclic voltammetry (CV) measurements, it showed that the copolymers exhibit not only a low bandgap of 1.29 eV and 1.51 eV but also a deep highest occupied molecular orbital (HOMO) of -5.49 and -5.11 eV. Moreover, photovoltaic properties in combination with the fullerene derivatives were investigated. The device based on the copolymers with PC71BM exhibited higher maximum power conversion efficiency and higher maximum short-circuit current density of 0.23% with 1.64 mA cm(-2) of PDTP-IID:PC71BM and 0.13% with 1.11 mA cm(-2) of PDTP-Thz:PC71BM than those of the copolymers with PC61BM. Measurements performed for N-hexyl-dithieno(3,2-b:2 ',3 '-d)pyrrole-based copolymers proved the potential of these polymers to be applied in optoelectronic applications.
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