Direct Observation of the Dipole-Induced Energetic Disorder in Rubrene Single-Crystal Transistors by Scanning Kelvin Probe Microscopy

The Journal of Physical Chemistry Letters
Yuanyuan HuZhuojun Chen

Abstract

It is commonly accepted that gate dielectric dipoles can induce energetic disorder in organic field-effect transistors. However, convincing experimental evidence that directly demonstrate this effect are still in lack. In this work, we present a combined experimental and theoretical study to reveal this effect. We have investigated the temperature-dependent mobility of two rubrene single-crystal transistors with different polymer dielectrics. Model fittings of the data indicate there is higher energetic disorder in the device on dielectric with larger permittivity. Scanning Kelvin probe microscopy was then employed to directly characterize the density of tail states, which is correlated with energetic disorder, in the devices. The results further confirm that dielectric dipoles can increase energetic disorder in organic semiconductors.

References

Sep 28, 2004·Physical Review Letters·V PodzorovM E Gershenson
Nov 7, 2006·Nature Materials·I N HuleaA F Morpurgo
Sep 21, 2010·Advanced Materials·Yunlong GuoYunqi Liu
Jun 28, 2011·Physical Review Letters·Ilja LangeDieter Neher
May 4, 2013·ACS Applied Materials & Interfaces·Yaorong SuJianbin Xu
Dec 18, 2013·Advanced Materials·Nikolas A MinderAlberto F Morpurgo
Jun 25, 2016·Science·Iain McCullochMichael Chabinyc
Dec 20, 2017·Nature Materials·Hyun Ho ChoiVitaly Podzorov

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Citations

Nov 6, 2018·Journal of the American Chemical Society·Ganna Gryn'ovaClémence Corminboeuf
Jun 28, 2019·The Journal of Physical Chemistry Letters·Samantha HoodArdalan Armin

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