The impact of device polarity on the performance of Polymer-Fullerene solar cells
| Autor: | Mengmeng Li, Junyu Li, René A. J. Janssen, Baojun Lin, Junke Wang, Wei Ma, Fallon J. M. Colberts, MM Martijn Wienk, Dario Di Carlo Rasi, Weiwei Li, Gaël H. L. Heintges |
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| Přispěvatelé: | Molecular Materials and Nanosystems, Macromolecular and Organic Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Fullerene Organic solar cell Polarity (physics) 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Polymer solar cell General Materials Science Solubility morphology control device polarity chemistry.chemical_classification Renewable Energy Sustainability and the Environment business.industry Energy conversion efficiency Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Semiconductor chemistry Chemical engineering light absorption 0210 nano-technology business polymer solar cells |
| Zdroj: | Advanced Energy Materials, 8(22):1800550. Wiley-VCH Verlag Advanced Energy Materials Advanced Energy Materials, 8, 1800550 |
| ISSN: | 1614-6832 |
| DOI: | 10.1002/aenm.201800550 |
| Popis: | 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. c.2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| Databáze: | OpenAIRE |
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