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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 24620–24629

Laser-induced selective crosslinking for scaling the heterointerfacial domain in polymer blends

Xinping Zhang and Hongwei Li  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 24620-24629 (2013)

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Organic blends containing heterojunction structures at the interfacial phase have been applied extensively in organic optoelectronic devices to modify charge transfer, separation, and recombination processes. Scaling and controlling the transition domains at the hetero-interface are of crucial importance for deep insights into the involved physics and for architecturing the devices with improved performance. However, it is difficult to recognize and characterize these transition domains directly using the conventional microscopic techniques, in particular when different molecules are dissolved in the same solvent with equal solubility. In this work, we introduce a technique defined as laser-induced selective cross-linking to isolate the interfacial phase from other phases into a directly measurable practicity. Thus, the hetero-domains become visualized and directly measurable. Based on the insolubility of the selectively cross-linked molecules in organic solvents, a lift-off process may remove the uncross-linked or incompletely cross-linked molecules, so that the hetero-domain is more clearly visualized and more precisely measured. A transition domain in a scale of about 200 nm is resolved in the F8BT/PFB blend film between their respectively rich phases after the selective cross-linking of the F8BT molecules by a blue laser. Furthermore, hetero-crosslinking between F8BT and PFB molecules was also resolved by both microscopic and near-field spectroscopic investigations.

© 2013 Optical Society of America

OCIS Codes
(160.4890) Materials : Organic materials
(160.6000) Materials : Semiconductor materials
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:

Original Manuscript: September 12, 2013
Revised Manuscript: September 27, 2013
Manuscript Accepted: September 30, 2013
Published: October 7, 2013

Xinping Zhang and Hongwei Li, "Laser-induced selective crosslinking for scaling the heterointerfacial domain in polymer blends," Opt. Express 21, 24620-24629 (2013)

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