Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Organic Electronics and Photovoltaics 1

CPP 1.11: Talk

Monday, September 5, 2022, 12:30–12:45, H38

Towards all solution-processed OFETs using microcontact printed electrodes — •Kirill Gubanov¹, Manuel Johnson¹, Melda Akay¹, Kim Thomann¹, Dan Shen^1,2, Xing Cheng², and Rainer H. Fink¹ — ¹Physikalische Chemie II, Friedrich-Alexander Universität Erlangen-Nürnberg, Germany — ²South University of Science and Technology, Shenzhen, China

Printed electronics is expected to facilitate low-cost solvent prepared devices for potential applications in RFID, flexible displays, OLEDs and transistors. Furthermore, microcontact printing may be used in a large-scale production using roll-to-roll printing with direct access to structures on the micrometer level. The preparation of the microstructured conductive electrodes using PEDOT:PSS ink for applications in OFETs was successful in various aspects: the electrodes were fabricated with very good structural definition and high reproducibility on solvent-prepared 2D-extended single-crystalline C8-BTBT films. A defined mechanical load of the PDMS stamps pre-treated with O2 plasma yielded good structural quality and competitive electrical performance. In particular, the implementation of the MWCNTs in the PEDOT:PSS ink has a direct impact on the charge carriers transport efficiency, leading to the contact resistance decrease. In addition to electrical characterization made with KPFM and IV-curves, the morphology and structure analysis was performed using VLM, AFM and 3D Microscopy, providing with an insight into the structural quality of the contacts and relate their structures to the overall device performances. The research is funded by the BMBF (contract 05K19WE2).