Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800550
Keywords
device polarity; light absorption; morphology control; polymer solar cells
Categories
Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie grant [747422]
- Ministry of science and technology [2016YFA0200700]
- NSFC [21504066, 21534003]
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC [339031]
- Ministry of Education, Culture and Science [024.001.035]
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Diketopyrrolopyrrole (DPP)-conjugated polymers are a versatile class of semiconductors for application in organic solar cells because of their tunable optoelectronic properties. A record power conversion efficiency (PCE) of 9.4% was recently achieved for DPP polymers, but further improvements are required to reach true efficiency limits. Using five DPP polymers with different chemical structures and molecular weights, the device performance of polymer:fullerene solar cells is systematically optimized by considering device polarity, morphology, and light absorption. The polymer solubility is found to have a significant effect on the optimal device polarity. Soluble polymers show a 10-25% increase in PCE in inverted device configurations, while the device performance is independent of device polarity for less soluble DPP derivatives. The difference seems related to the polymer to fullerene weight ratio at the ZnO interface in inverted devices, which is higher for more soluble DPP polymers. Optimization of the nature of the cosolvent to narrow the fibril width of polymers in the blends toward the exciton diffusion length enhances charge generation. Additionally, the use of a retroreflective foil increases absorption of light. Combined, the effects afford a PCE of 9.6%, among the highest for DPP-based polymer solar cells.
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