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ACS Appl Mater Interfaces. 2018 Feb 21;10(7):6491-6497. doi: 10.1021/acsami.7b17368. Epub 2018 Feb 7.

The Effect of Oxygen Uptake on Charge Injection Barriers in Conjugated Polymer Films.

Author information

1
Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University , 200241 Shanghai, P.R. China.
2
Division of Surface Physics and Chemistry, IFM, Linköping University , SE-58183 Linköping, Sweden.

Abstract

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.

KEYWORDS:

barrier; charge injection; conjugated polymer; organic electronics; spectroscopy

PMID:
29377664
DOI:
10.1021/acsami.7b17368
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