A comparative study of hydrogen- and hydroxyl-related pentacene defect formation in thin films prepared by Langmuir-Blodgett technique and thermal evaporation
✍ Scribed by Gmucová, Katarína ;Weis, Martin ;Pirriera, Monica Della ;Puigdollers, Joaquim
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 463 KB
- Volume
- 206
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
The process of pentacene defects formation in aqueous environment was studied. Pentacene thin films (∼10 nm) covered platinum electrodes were prepared either by the Langmuir–Blodgett (LB) technique or by the standard thermal evaporation in high vacuum. Voltammograms were taken in various acidic and basic environments, results are discussed with the aim to extract the information about the dynamics of hydrogen‐ and hydroxyl‐related defects formation in the above‐mentioned thin films. Obtained data confirm that LB films immersed in aqueous environment are prone to more expressive defect formation (e.g., two orders higher for dihydropentacene) as obvious for thermally evaporated films. A possible explanation of this fact resides in a hypothetic existence of energetically more favourable sites for hydrogen bonding from aqueous environment on both the pentacene and pentacenequinone molecules comprised in films prepared by the LB technique. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)