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Electronic Structure Characterization of Cross-Linked Sulfur Polymers
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. KTH Royal Inst Technol, Div Appl Phys Chem, Dept Chem, Stockholm, Sweden.ORCID iD: 0000-0002-9432-3112
KTH Royal Inst Technol, Div Appl Phys Chem, Dept Chem, SE-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.ORCID iD: 0000-0002-6471-1093
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.ORCID iD: 0000-0003-2412-8503
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2018 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 19, no 9, p. 1041-1047Article in journal (Refereed) Published
Abstract [en]

Cross-linked polymers of elemental sulfur are of potential interest for electronic applications as they enable facile thin-film processing of an abundant and inexpensive starting material. Here, we characterize the electronic structure of a cross-linked sulfur/diisopropenyl benzene (DIB) polymer by a combination of soft and hard X-ray photoelectron spectroscopy (SOXPES and HAXPES). Two different approaches for enhancing the conductivity of the polymer are compared: the addition of selenium in the polymer synthesis and the addition of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) during film preparation. For the former, we observe the incorporation of Se into the polymer structure resulting in a changed valence-band structure. For the latter, a Fermi level shift in agreement with p-type doping of the polymer is observed and also the formation of a surface layer consisting mostly of TFSI anions.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 19, no 9, p. 1041-1047
Keywords [en]
cross-linking, hole-transporting material, solar cells, sulfur polymers, X-ray photoelectron spectroscopy
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-356387DOI: 10.1002/cphc.201800043ISI: 000431492600005PubMedID: 29451358OAI: oai:DiVA.org:uu-356387DiVA, id: diva2:1235470
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Swedish Energy AgencySwedish Research Council, 2014-6463StandUpAvailable from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-07-25Bibliographically approved

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Cappel, Ute B.Johansson, FredrikPhilippe, BertrandLindblad, AndreasRensmo, Håkan

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