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Electronic Structure Characterization of Cross-Linked Sulfur Polymers
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-9432-3112
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.ORCID iD: 0000-0001-5069-3245
Uppsala Univ, Div Mol & Condensed Matter Phys, Dept Phys & Astron, SE-75120 Uppsala, Sweden..
Uppsala Univ, Div Mol & Condensed Matter Phys, Dept Phys & Astron, SE-75120 Uppsala, Sweden..
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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
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-228264DOI: 10.1002/cphc.201800043ISI: 000431492600005PubMedID: 29451358Scopus ID: 2-s2.0-85042538116OAI: oai:DiVA.org:kth-228264DiVA, id: diva2:1209511
Note

QC 20180523

Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-05-23Bibliographically approved

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Cappel, Ute B.Liu, PengKloo, LarsGardner, James M.

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