Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 5: Organic Thin Films, Organic-Inorganic Interfaces

DS 5.3: Vortrag

Montag, 5. September 2022, 12:00–12:15, H17

Contact Primers: A new Approach to Reducing Contact Resistance in Organic Field-Effect Transistors — •Yurii Radiev and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7, 35037 Marburg, Germany

Methods to reduce contact resistance have long been of interest to researchers that aim to improve performance of organic electronic devices. Caused by the injection barrier at the metal-organic semiconductor interface, contact resistance was shown to be one of the main obstacles on the way to producing high-frequency organic field-effect transistors (OFETs), limiting the switching frequency of such transistors to well below gigahertz range [1]. In this work we report on the contact primer method [2] -- a method that allows selective modification of the work function of the electrodes in a bottom gate-bottom contact OFET structure. The modified work function reduces the charge carrier injection barrier and improves the morphology of the subsequently deposited thin film on top. We demonstrate this effect for both p- and n-type OFETs by employing various organic contact primer materials to increase and reduce the work function of gold electrodes, respectively. Combining this device-oriented approach with a rigorous investigation of the employed material systems on model substrates, we are able to achieve deeper understanding of the phenomena that lead to a reduced contact resistance [3].

[1] U. Zschieschang, et al., Adv. Func. Mater. 30, 1903812 (2020).

[2] F. Widdascheck, et al., Adv. Funct. Mater. 29, 1808385 (2019).

[3] Y. Radiev, et al., Org. Electron. 89, 106030 (2021).