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Molecular Orientation of Polymer Acceptor Dominates Open-Circuit Voltage Losses in All-Polymer Solar Cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Xi An Jiao Tong Univ, Peoples R China.
Xi An Jiao Tong Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Xi An Jiao Tong Univ, Peoples R China.
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2019 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 4, no 5, p. 1057-1064Article in journal (Refereed) Published
Abstract [en]

Low open-circuit voltage (V-oc) induced by energy loss in organic solar cells is considered to be one of the most influencing factors limiting device performance, in which morphology of the active layer plays a crucial role in determining energy loss. By employing a bilayer structure of the P3HT:N2200 all-polymer system, we have identified the isolated impact of a molecular packing structure on device V-oc with analysis of energy loss processes. Thermal annealing and various solvents were used to control molecular orientation in P3HT:N2200 bilayer devices, in which different V-oc spanning from 0.45 to 0.54 V could be obtained. It was found that energy of charge-transfer state (E-ct) differed in these bilayer devices. Besides, increased charge recombination could be observed in bilayer devices when N2200 layers exhibited face-on orientation, which caused an additional energy loss and decreased V-oc. Our results suggest that rational control of polymer molecular orientation is essential to reduce the energy loss and ultimately achieve high V-oc in all-polymer solar cells.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 4, no 5, p. 1057-1064
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:liu:diva-158366DOI: 10.1021/acsenergylett.9b00416ISI: 000468015600011OAI: oai:DiVA.org:liu-158366DiVA, id: diva2:1333830
Note

Funding Agencies|Ministry of Science and Technology [2016YFA0200700]; NSFC [21704082, 21875182, 21534003, 51320105014]; China Postdoctoral Science Foundation [2017M623162]; 111 project 2.0 [BP2018008]; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]

Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-07-02

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CiteExportLink to record
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