Oxygen diffusion dynamics in organic semiconductor films

Shoaee, Safa and Durrant, James R. (2015) Oxygen diffusion dynamics in organic semiconductor films. Journal of Materials Chemistry C, 3 39: 10079-10084. doi:10.1039/c5tc02822a

Author Shoaee, Safa
Durrant, James R.
Title Oxygen diffusion dynamics in organic semiconductor films
Journal name Journal of Materials Chemistry C   Check publisher's open access policy
ISSN 2050-7526
Publication date 2015-10-21
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c5tc02822a
Open Access Status Not Open Access
Volume 3
Issue 39
Start page 10079
End page 10084
Total pages 6
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract Transient absorption spectroscopy is commonly used to probe the yield and kinetics of excited states of materials. We present a transient absorption spectroscopic assay of oxygen diffusion in a series of solution-processed polymer films. The films were partially encapsulated with an epoxy/glass top barrier as a simple model system for organic photovoltaic and light emitting devices with metal top contacts. The results presented herein show that this spectroscopic approach can be a versatile and quantitative in situ assay of local oxygen concentrations in such organic semiconductor films. With our current apparatus, the approach has a time resolution of 5 seconds, thereby enabling direct measurement of oxygen diffusion kinetics into a semiconductor film. The versatility of this approach suggests it could be widely applicable to measurement of oxygen diffusion into organic optoelectronic devices, including for example oxygen diffusion through encapsulation and barrier layers. Employing this approach, we demonstrate significant differences in oxygen diffusion kinetics between different semiconducting polymers. We furthermore demonstrate the impact of an additional getter (ZnO) and light exposure upon the local oxygen concentration, providing new insights into the role of oxygen diffusion kinetics in determining the environmental stability of organic semiconductors.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
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