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Writing and Low-Temperature Characterization of Oxide Nanostructures

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Local scale structural changes of working OFET devices.

L S Grodd¹, E Mikayelyan¹, T Dane²

¹Department of Physics, University of Siegen, Walter-Flex-Straße 3, 57072 Siegen, Germany. grigorian@physik.uni-siegen.de.

|November 21, 2019

Summary

This summary is machine-generated.

We used nanobeam grazing-incidence X-ray diffraction (nanoGIXD) to study operating organic field-effect transistors (OFETs). We observed significant changes in gold electrodes, including atom diffusion and nanocrystallite reorientation, impacting device interfaces.

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

Organic field-effect transistors (OFETs) are crucial for flexible electronics.
Understanding the operational stability of OFETs requires in-depth structural analysis.
Interfacial dynamics between electrodes and organic semiconductors significantly influence device performance.

Purpose of the Study:

To investigate the structural evolution of real-sized organic field-effect transistors (OFETs) during operation.
To spatially resolve structural changes within the polymer channel and at electrode interfaces.
To evaluate the potential of nanobeam grazing-incidence X-ray diffraction (nanoGIXD) for probing working organic electronic devices.

Main Methods:

In situ nanobeam grazing-incidence X-ray diffraction (nanoGIXD) was employed.
Real-sized poly(3-hexylthiophene) (P3HT) based OFETs were studied under applied voltage.
Structural analysis focused on the polymer channel and gold source/drain electrode interfaces before and after operation.

Main Results:

Significant alterations in gold electrode morphology were observed.
Diffusion of gold (Au) atoms into the P3HT polymer channel was detected.
Local reorientation of recrystallized gold nanocrystallites was quantified using Hermans' orientation factors.
Initially sharp electrode-polymer interfaces were found to be significantly modified post-operation.

Conclusions:

Device operation leads to substantial changes in the electrode-polymer interface.
NanoGIXD is a powerful technique for analyzing the functionality and reliability of operating organic electronic devices.
Understanding these structural modifications is key to improving OFET performance and longevity.