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Sipei Zhang

Univerisity of Science and Technology Beijing, China; 2007
B.S. Materials Chemistry

Email: zhang708@umn.edu

Research: Optimization of Ion Gel Gate Dielectrics for Organic Thin Film Transistors (OTFTs)

An ion gel self-assembled by an ABA type triblock copolymer in an ionic liquid (where the B block is soluble in an ionic liquid but the A blocks are not) can be used as a gate dielectric for OTFTs. Due to the exceptionally high specific capacitance of the ion gel, low-voltage operation (around 1~2 V) and high ON current (around 1 mA) can be achieved. The goal of my research is to study the properties of ion gels through the variation of block identity, block length, and ionic liquid, in order to enable rational design of these high performance micro-structured gel electrolytes, and ultimately be able to optimize the ion gels as gate dielectric materials.

Publications

"Ionic Conductivity, Capacitance, and Viscoelastic Properties of Block Copolymer-Based Ion Gels" Sipei Zhang, Keun Hyung Lee, C. Daniel Frisbie, Timothy P. Lodge, Macromolecules 2011, 44, 940-949

"Electrical Impedance of Spin Coatable Ion Gel Films " Keun Hyung Lee, Sipei Zhang, Timothy P. Lodge, C. Daniel Frisbie,J. Phys. Chem. B 2011, accepted