Send to

Choose Destination
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

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


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.


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

Free full text

Supplemental Content

Full text links

Icon for American Chemical Society Icon for Linkoping University Electronic Press
Loading ...
Support Center