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The Effect of Oxygen Uptake on Charge Injection Barriers in Conjugated Polymer Films
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering. East China Normal Univ, Peoples R China; Soochow Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
East China Normal Univ, Peoples R China.
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 7, p. 6491-6497Article in journal (Refereed) Published
Abstract [en]

The energy offset between the electrode Fermi level and organic semiconductor transport levels is a key parameter controlling the charge injection barrier and hence efficiency of organic electronic devices. Here, we systematically explore the effect of in situ oxygen exposure on energetics in n-type conjugated polymer P(NDI2OD-T2) films. The analysis reveals that an interfacial potential step is introduced for a series of P(NDI2OD-T2) electrode contacts, causing a nearly constant downshift of the vacuum level, while the ionization energies versus vacuum level remain constant. These findings are attributed to the establishment of a so-called double-dipole step via motion of charged molecules and will modify the charge injection barriers at electrode contact. We further demonstrate that the same behavior occurs when oxygen interacts with p-type polymer TQ1 films, indicating it is possible to be a universal effect for organic semiconductOrs.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 10, no 7, p. 6491-6497
Keyword [en]
charge injection; barrier; spectroscopy; conjugated polymer; organic electronics
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Identifiers
URN: urn:nbn:se:liu:diva-145757DOI: 10.1021/acsami.7b17368ISI: 000426143900048PubMedID: 29377664OAI: oai:DiVA.org:liu-145757DiVA, id: diva2:1192494
Note

Funding Agencies|National Science Foundation of China [11604099]; ECNU Team Building grant; Fundamental Research Funds for the Central Universities; Swedish Foundation for Strategic Research [SE13-0060]; Swedish Research Council [2016-05498]; Goran Gustafsson Foundation for Research in Nature Sciences and Medicine; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]

Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-04-13

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The full text will be freely available from 2019-01-29 12:54
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