High-Performance Organic Field-Effect Transistors with Directionally Aligned Conjugated Polymer Film Deposited from Pre-Aggregated Solution

By Nam-Koo Kim, Soo-Young Jang, G. Pace, M. Caironi, Won-Tae Park, Dongyoon Khim, Juhwan Kim, Dong-Yu Kim, Yong‐Young Noh. 2015

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In this report, we investigate a formation mechanism for polymer chains aligned with various semiconductor polymers and a microstructure for directionally aligned film through systematic analysis that includes polarized UV–visible–near infrared (UV–vis–NIR) absorption spectroscopy, atomic force microscopy, polarized charge modulation microscopy (p-CMM), and incident X-ray diffraction (GIXD) measurements. Through this study, we make two important observations: first, the highly aligned organic polymer semiconductor films are achieved by off-center spin coating of the preaggregated conjugated polymer solution. Second, the directionally aligned conjugated polymer films exhibit a larger anisotropy on the top surface compared with bulk film, which allows effective mobility improvement in top-gate/bottom-contact field-effect transistors with high performance uniformity. Finally, we demonstrate high-mobility organic field-effect transistors (OFETs) (7.25 cm2/(V s)) with a mobility large anisotropy (37-fold) usin...

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/34f052d922e49cf7e374398cdd30a20f7fc86073