C. Daniel Frisbie Group
Chemical Engineering & Materials Science
University of Minnesota - Twin Cities 		Films & Interfaces,
Molecular Crystals,
Molecular Electronics,
Organic Semiconductors,
Scanning Probe Microscopy

Xiuyu Cai Xiuyu Cai
Jilin University - Changchun, China; 1999
B.S. Materials Science and Engineering
 Email: xcai@mozart.cems.umn.edu

Charge Carrier Transport in Organic Semiconductors Probed by Organic Thin Film Transistors

Organic semiconductors have been the subjects for intense scientific research for the past 60 years. The processing characteristics and performance of organic thin film transistors (OTFTs) suggest that they can be competitive for applications requiring large-area coverage, structural flexibility, low-temperature processing, and low end.

My primary research is to study how the charge carriers transport in organic semiconductors when most or almost all traps have been filled. The high dielectric constant gate insulators will be employed to induce charge carriers up to 1014 order of magnitude to fill the traps.

My research is also involved in studying charge carrier transport in single grains and across individual grain boundaries of crystalline organic semiconductor thin films. The sub-micron shadow masks fabricated by e-beam lithography help us to define channel within one single grain or across one individual grain boundary. This research can tell us what role grain boundaries play in charge carrier transport.

In addition, part of my research is to study new n-channel organic semiconductors. To realize complementary circuit design, the development of n-channel organic semiconductors is necessary. Collaborating with chemists in Chemistry department, I am expecting to develop some new n-channel organic semiconductors.

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