期刊
POLYMER CHEMISTRY
卷 7, 期 9, 页码 1747-1755出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py01985k
关键词
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资金
- National Natural Science Foundation of China [51573154, 91233112, 51273168, 51403178]
- Program for Innovative Research Cultivation Team in University of the Ministry of Education of China [1337304]
- Innovation Group in Hunan Natural Science Foundation [12JJ7002]
- Hunan Provincial Education Department [13A102]
- Natural Science Foundation of Hunan [14JJ4019, 2015JJ3113]
- Open Project for the National Key Laboratory of Luminescent Materials and Devices [2014-skllmd-10]
Two novel donor-acceptor (D-A) type random conjugated terpolymers PBDTT-PPzIID and PBDTT-PPzDPP were synthesized by copolymerizing electron-rich alkylthienyl benzodithiophene (BDTT) and two different electron-deficient units, in which phenanthrophenazine (PPz) was the first acceptor unit, and isoindigo (IID) or diketopyrrolopyrrole (DPP) with a strong electron-withdrawing ability was the second acceptor unit, respectively. Compared to their parent polymer PTTPPz-BDTT, a broadening of the band in the long wavelength region from 500 to 850 nm and a significant decrease in HOMO levels were observed for the random terpolymers. Ca and PFN-Br were used as interfacial layers to optimize the devices, respectively. Pleasingly, after replacing Ca/Al with PFN-Br/Al as the cathode, the performance of both polymer devices improved greatly. A maximum power conversion efficiency (PCE) of 5.91% was obtained with a V-oc of 0.73 V, a J(sc) of 11.75 mA cm(-2) and a FF of 68.8% in the PBDTT-PPzDPP/PC71BM-based device, while the PBDTT-PPzIID/PC71BM-based device achieved a PCE of 4.21%. To the best of our knowledge, this is one of the highest recorded FF values among PSCs based on previously reported phenazine copolymers.
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