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Design Rule for Improved Open-Circuit Voltage in Binary and Ternary Organic Solar Cells
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Stanford University, CA 94305 USA.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7104-7127
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 42, p. 37070-37077Article in journal (Refereed) Published
Abstract [en]

Mixing different compounds to improve functionality is one of the pillars of the organic electronics field. Here, the degree to which the charge transport properties of the constituent materials are simply additive when materials are mixed is quantified. It is demonstrated that in bulk heterojunction organic solar cells, hole mobility in the donor phase depends critically on the choice of the acceptor material, which may alter the energetic disorder of the donor. The same holds for electron mobility and disorder in the acceptor. The associated mobility differences can exceed an order of magnitude compared to pristine materials. Quantifying these effects by a state-filling model for the open-circuit voltage (V-oc) of ternary Donor:Acceptor(l):Acceptor(2) (D:A(1):A(2)) organic solar cells leads to a physically transparent description of the surprising, nearly linear tunability of the Voc with the A(1):A(2) weight ratio. It is predicted that in binary OPV systems, suitably chosen donor and acceptor materials can improve the device power conversion efficiency (PCE) by several percentage points, for example from 11 to 13.5% for a hypothetical state-ofthe-art organic solar cell, highlighting the importance of this design rule.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 42, p. 37070-37077
Keyword [en]
organic solar cells; ternary blends; bulk heterojunctions; open-circuit voltage; energetic disorder
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:liu:diva-143091DOI: 10.1021/acsami.7b08276ISI: 000414115700064PubMedID: 28967245OAI: oai:DiVA.org:liu-143091DiVA: diva2:1159411
Available from: 2017-11-22 Created: 2017-11-22 Last updated: 2017-12-14

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The full text will be freely available from 2018-10-02 11:48
Available from 2018-10-02 11:48

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