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Apostoluk, Aleksandra
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Publications (15/15 displayed)
- 2021Metallic oxide defect luminescent emission for application in solar cells and WLEDs
- 2017Sol-gel processing of hybrid ZnO quantum dots mesospheres for LED applications
- 2016Zinc oxide nanocomposites for solar energy conversion and LED applications
- 2016Intense visible emission from ZnO/PAAX (X = H or Na) nanocomposite synthesized via a simple and scalable sol-gel methodcitations
- 2009Growth of thin polymer films containing side-chain azo-dye analyzed by atomic force microscopycitations
- 2007Dual-frequency coherent induction of non-centrosymmetry in a chiral bisazo-dye doped polymer filmcitations
- 2007Influence of molecular chain orientation on optical and carrier transport properties of polymer blends
- 2007Effect of the molecular chain orientation on carrier transport and optical properties of polymer blends
- 2007Influence of polar molecular chain orientation on optical and carrier transport properties of polymer blendscitations
- 2006Effect of molecular chain orientation on carrier transport and optical properties of polymer blends
- 2006Optical and carrier transport properties of polymer blends as influenced by polar molecular chain orientation
- 2004Photoinduction of surface-relief gratings during all-optical poling of polymer filmscitations
- 2004Semiconducting dye-functionalised poled polymers for photovoltaic applications
- 2003Quasi phase matched chi(2) gratings printed with various memory mechanisms by dual frequency interferences in polymer films
- 2002Quasi-phase-matched gratings printed by all-optical poling in polymer filmscitations
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article
Influence of polar molecular chain orientation on optical and carrier transport properties of polymer blends
Abstract
We report investigation of optical and electrical properties of poly(9-vinylcarbazole) (PVK) doped with 30 wt% 4-dibutylamino-4′-nitrostilbene (DBANS), depending on the molecular chain orientation of polar DBANS molecules. Orientation of dopant diode-like DBANS dye molecules was achieved by application of a static electric field through the polymer film, while heating the material near its glass transition temperature (Tg). Modification of optical properties due to the orientation was evidenced by the spectral dependencies of absorption coefficient. Appearance of the orientation-induced built-in electrical field was proven optically by the solid electric field induced second harmonic generation (SEFISHG) and electrically by current–voltage (IV) characterization. Measurement of the thermally stimulated currents (TSC) spectra demonstrated that carrier transport and trapping are affected, too. Changes of the TSCs induced by orientation were expressed best in the temperature range of 280–290 K. They could be attributed to the thermally activated process with activation energy of about 0.38 eV.Previous article in issue