Presentation Title

IMPROVING CHARGE MOBILITY OF ORGANIC FIELD EFFECT TRANSISTORS THROUGH POLYMER STRUCTURE DESIGN AND DEVICE ENGINEERING

Start Date

November 2016

End Date

November 2016

Location

Watkins 2141

Type of Presentation

Oral Talk

Abstract

Organic field effect transistors (OFETs) are the fundamental building blocks of emerging flexible electronics such as flexible displays, sensors, and health-care devices. In order to commercialize OFETs and thus, flexible electronics, it is crucial to design materials with higher charge carrier mobility; a property that characterizes how quickly charge carriers move within an electric field.

For a series of conjugated co-polymers with alternating electron-rich and electron-poor units, we studied the effect of chemical structure on mobility. We discovered that altering the electron-poor unit can increase charge carrier mobility 100-fold. In addition, altering the electron-poor unit can result in an increase or decrease in mobility with heating. This may be attributed to changes in the molecular orbital overlap of the polymer chains which leads to upgraded molecular structure within a solid-state thin film. By using nano-grooved substrates instead of normal flat substrates, we improved the molecular packing of our thin films and thereby improved the mobility 10-fold. This fundamental knowledge of organic semiconductors provides guidelines for molecular design and device engineering that has resulted in high mobility, which will lead to robust devices with enhanced performance.

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Nov 12th, 11:30 AM Nov 12th, 11:45 AM

IMPROVING CHARGE MOBILITY OF ORGANIC FIELD EFFECT TRANSISTORS THROUGH POLYMER STRUCTURE DESIGN AND DEVICE ENGINEERING

Watkins 2141

Organic field effect transistors (OFETs) are the fundamental building blocks of emerging flexible electronics such as flexible displays, sensors, and health-care devices. In order to commercialize OFETs and thus, flexible electronics, it is crucial to design materials with higher charge carrier mobility; a property that characterizes how quickly charge carriers move within an electric field.

For a series of conjugated co-polymers with alternating electron-rich and electron-poor units, we studied the effect of chemical structure on mobility. We discovered that altering the electron-poor unit can increase charge carrier mobility 100-fold. In addition, altering the electron-poor unit can result in an increase or decrease in mobility with heating. This may be attributed to changes in the molecular orbital overlap of the polymer chains which leads to upgraded molecular structure within a solid-state thin film. By using nano-grooved substrates instead of normal flat substrates, we improved the molecular packing of our thin films and thereby improved the mobility 10-fold. This fundamental knowledge of organic semiconductors provides guidelines for molecular design and device engineering that has resulted in high mobility, which will lead to robust devices with enhanced performance.