Tuning contact resistance in top-contact p-type and n-type organic field effect transistors by self-generated interlayers

Tanmoy Sarkar, Basel Shamieh, Roy Verbeek, Auke Jisk Kronemeijer, Gerwin H. Gelinck, Gitti L. Frey (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

Contact resistance significantly limits the performance of organic field-effect transistors (OFETs). Positioning interlayers at the metal/organic interface can tune the effective work-function and reduce contact resistance. Myriad techniques offer interlayer processing onto the metal pads in bottom-contact OFETs. However, most methods are not suitable for deposition on organic films and incompatible with top-contact OFET architectures. Here, a simple and versatile methodology is demonstrated for interlayer processing in both p- and n-type devices that is also suitable for top-contact OFETs. In this approach, judiciously selected interlayer molecules are co-deposited as additives in the semiconducting polymer active layer. During top contact deposition, the additive molecules migrate from within the bulk film to the organic/metal interface due to additive-metal interactions. Migration continues until a thin continuous interlayer is completed. Formation of the interlayer is confirmed by X-ray photoelectron spectroscopy (XPS) and cross-section scanning transmission electron microscopy (STEM), and its effect on contact resistance by device measurements and transfer line method (TLM) analysis. It is shown that self-generated interlayers that reduce contact resistance in p-type devices, increase that of n-type devices, and vice versa, confirming the role of additives as interlayer materials that modulate the effective work-function of the organic/metal interface.

Original languageEnglish
Article number1805617
Number of pages9
JournalAdvanced Functional Materials
Volume30
Issue number18
DOIs
Publication statusPublished - 1 May 2020

Bibliographical note

This article also appears in: Hot Topic: Organic Electronics
Special Issue: Guangdong–Technion Israel Institute of Technology

Keywords

  • organic electronics
  • organic field-effect transistors
  • self-generated interlayers
  • TLM

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