Journal
ADVANCED SCIENCE
Volume 3, Issue 9, Pages -Publisher
WILEY
DOI: 10.1002/advs.201600032
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Funding
- Ministry of Science and Technology [2014CB643501]
- Natural Science Foundation of China [51303056, 21520102006, 51521002, 21490573]
- Guangdong Natural Science Foundation [S2012030006232]
- U.S. Office of Naval Research [N00014-15-1-2244]
- DOE, Office of Science, and Office of Basic Energy Sciences
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A novel donor-acceptor type conjugated polymer based on a building block of 4,8-di(thien-2-yl)-6-octyl-2-octyl-5 H-pyrrolo[3,4-f]benzotriazole-5,7(6H)-dione (TZBI) as the acceptor unit and 4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo[1,2-b : 4,5-b']dithiophene as the donor unit, named as PTZBIBDT, is developed and used as an electron-donating material in bulk-heterojunction polymer solar cells. The resulting copolymer exhibits a wide bandgap of 1.81 eV along with relatively deep highest occupied molecular orbital energy level of -5.34 eV. Based on the optimized processing conditions, including thermal annealing, and the use of a water/alcohol cathode interlayer, the single-junction polymer solar cell based on PTZBIBDT: PC71BM ([6,6]-phenyl-C-71-butyric acid methyl ester) blend film affords a power conversion efficiency of 8.63% with an open-circuit voltage of 0.87 V, a short circuit current of 13.50 mA cm(-2), and a fill factor of 73.95%, which is among the highest values reported for wide-bandgap polymers-based single-junction organic solar cells. The morphology studies on the PTZBIBDT: PC71BM blend film indicate that a fibrillar network can be formed and the extent of phase separation can be manipulated by thermal annealing. These results indicate that the TZBI unit is a very promising building block for the synthesis of wide-bandgap polymers for high-performance single-junction and tandem (or multijunction) organic solar cells.
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