期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 36, 页码 18442-18449出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05014f
关键词
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资金
- National Natural Science Foundation of China [91333204, 91433117, 51203168, 51422306]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12030200]
- Soochow University [32317366, 32317400]
A novel n-type two-dimensional (2D) conjugated polymer based on bithienyl-benzodithiophene (BDT) and perylene diimide (PDI), P(PDI-BDT-T), was synthesized by Stille coupling for application as an acceptor material in all-polymer solar cells (all-PSCs). P(PDI-BDT-T) exhibits broad absorption in the visible region with an optical bandgap (E-g) of 1.64 eV, and a LUMO level of -3.89 eV, which is similar to and slightly higher than that of PCBM, indicating that the polymer is a suitable acceptor to replace PCBM in PSCs. PSCs with P(PDI-BDT-T) as the acceptor and PTB7-Th as the donor demonstrated a power conversion efficiency (PCE) of 4.71% with a J(sc) of 11.51 mA cm(-2), V-oc of 0.80 V, and FF of 51.1%. Meanwhile, the PCE of the PSCs based on the acceptor of a corresponding 1D-conjugated polymer P(PDI-BDT-O) with an alkoxy side chain on the BDT unit was only 2.75% with a J(sc) of 10.14 mA cm(-2), V-oc of 0.72 V, and FF of 37.6%. These results indicate that the 2D-conjugated P(PDI-BDT-T) is a promising acceptor material for all-PSCs.
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