tesi R. Miscioscia.pdf - EleA@UniSA

108 Exceptions in morphology-mobility relationship
3.1 Introduction
It’s known that morphology and charge transport in polycrystalline
pentacene is strongly related to gate-dielectric properties and, more in
detail, to dielectric-semiconductor interface nature [1]. Thus, in
OTFT’s performance optimization, it’s fundamental to qualify and
quantify the OSC/insulator interface features and control them in
device’s processing phase.
Literature studies report that in a pentacene medium the charge
mobility is limited by grain-boundaries (see [3][4][5] and their
references) as in models derived from amorphous and polycrystalline
silicon. There are, indeed, Research Teams which have obtained high
performance pentacene-based OTFTs having very small grains
(