Solution-processed pseudo-vertical organic transistors based on TIPS-pentacene

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Abstract

Powerful and versatile transistors are indispensable to realize the vision of future flexible electronics, e.g., for wearable active-matrix displays, smart sensors, or radio-frequency identification tags. Organic thin-film transistors are considered to be a perfect match for flexible electronics. However, conventional organic thin-film transistors still do not match the demanding performance targets of many applications. Furthermore, often complex and expensive fabrication steps are employed for the fabrication of hero-devices, which is not compatible with the paradigm of low-cost production of flexible electronics. In this contribution, we present the first solution-processed vertical organic field-effect transistor (VOFET) with good on-state performance comparable to vacuum-processed VOFETs. This approach unites the advantages of a low-temperature, low-cost solution processing with an ultra-short channel transistor concept possibly enabling large-area, low-cost flexible electronics. We examine the influence of different crystal morphologies (spherulitic and ribbons) on the transistor performance by using spin- and shear-coating as solution-based deposition methods. The solution-processed VOFETs reach channel width-normalized transconductances of up to 0.26 μS/μm with a charge carrier mobility of 4.8 cm 2/V. S-parameter measurements finally verify that transition frequencies up to 6 MHz are reachable with shear-coated TIPS-pentacene. However, compared to small molecule-based VOFETs, the solution-processed VOFETs show an unfavorably high off-state current and hysteresis, which are explained by background doping and charge carrier trapping. Hence, in order to advance with, further optimization of the semiconductor material and the insulator–semiconductor interface is thus required to qualify solution-processed VOFETs for commercial applications.

Details

OriginalspracheEnglisch
Aufsatznummer100697
Seitenumfang8
FachzeitschriftMaterials today energy
Jahrgang21
PublikationsstatusVeröffentlicht - Sept. 2021
Peer-Review-StatusJa

Externe IDs

Scopus 85104140016
ORCID /0000-0002-9773-6676/work/142247020
ORCID /0000-0002-4230-8228/work/142251394

Schlagworte

Schlagwörter

  • Semiconductors, Organic semiconductors, Organic field-effect transistor, High charge carrier mobility, Shear-coating, FIELD-EFFECT TRANSISTORS, THIN-FILM TRANSISTORS

Bibliotheksschlagworte