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Photo-Fries-based photosensitive polymeric interlayers for patterned organic devices
Alberto Montaigne Ramil1, Gerardo Hernandez-Sosa, Thomas Griesser
1Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University, Altenbergerstrasse 69, Linz, 4040 Austria.
Applied Physics. A, Materials Science & Processing
|June 21, 2013
Summary
Photosensitive polymer poly(diphenyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate) (PPNB) was investigated for organic electronics. UV-illumination quenched OLEDs and reduced OFET performance, despite altering PPNB properties.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Photosensitive polymers offer tunable properties for advanced electronic applications.
- The photo-Fries rearrangement is a key photochemical reaction altering polymer structure and function.
- Organic electronic devices like OLEDs and OFETs require precisely engineered interfacial layers.
Purpose of the Study:
- To investigate the utility of poly(diphenyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate) (PPNB) as an interfacial layer in organic electronics.
- To explore the impact of UV-induced photo-Fries rearrangement on PPNB's performance in organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs).
- To assess the influence of UV-treated PPNB on the morphology of small molecule organic semiconductors.
Main Methods:
- Fabrication of para-sexiphenyl (PSP) based OLEDs using PPNB:poly-vinylcarbazole (PVK) blends as interlayers.
- Construction of organic field-effect transistors (OFETs) employing PPNB as a gate dielectric layer.
- Atomic force microscopy (AFM) to study the growth of C60 and PSP on PPNB films before and after UV-illumination.
Main Results:
- UV-illumination of the PPNB:PVK blend in OLEDs resulted in complete quenching of electroluminescence.
- OFETs utilizing UV-treated PPNB as a gate dielectric exhibited reduced performance compared to those with untreated PPNB, despite an increased dielectric constant.
- UV-treatment of PPNB and PPNB:PVK blends influenced the growth morphology of C60 and PSP small molecules.
Conclusions:
- The photo-Fries rearrangement in PPNB significantly alters its properties, negatively impacting organic electronic device performance.
- UV-induced photochemical modification of PPNB offers a route for spatially controlled tuning of optical and electrical properties in organic electronics via photolithography.
- PPNB's photosensitivity presents challenges and opportunities for its application in next-generation organic electronic devices.
