Kin-Yiu Wong

PREVIOUS INSTITUTION: BS, Chinese University of Hong Kong, Hong Kong
DATE JOINED GROUP: June 2001
AREAS OF STUDY: Quantum chemical calculations; time-of-flight studies
EMAIL: kiniu@mps.ohio-state.edu
WEB: http://www.physics.ohio-state.edu/~kiniu/

CURRENT RESEARCH
My research is exploring conducting polymers and organic molecules in both theory and experiment.  For theory, quantum chemical calculations are performed to address the origin of the red shift of the emitted light under forward bias in color-variable alternating-current light emitting (SCALE) devices.  We found that the coulomb attraction due to protonation of pyridine rings by sulfonic acid containing polymers causes red shift in the band gap though the steric repulsion after protonation competes with the attraction.  For experiment, charge carrier mobilities of two new materials TPA-Cz3d and ANTH-OXA6t-oc12 are measured by the time of flight (TOF) method.  The TOF photocurrents are analyzed by both Xiaoming Zou’s model and Scher-Montroll model.  We conclude that Scher-Montroll model is not easy to be applied to obtain quantitative values of the mobility.  On the other hand, Zou’s model provides a way to obtain the mobility consistently and quantitatively for comparisons of all organic materials.  However, this model needs much more experimental data and agreements from some fundamental theory, such as quantum dynamics, to support.

PUBLICATIONS

• K.Y. Wong, J.A.O. Smallfield, M. Fahlman, and A.J. Epstein, Electronic State of Nitrogen Containing Polypyridnie at the Interfaces with Model Sulfonic Acid Containing Polymer and Molecule, Synthetic Metals 137, 1031-1032 (2003).

PRESENTATIONS AT CONFERENCES

• International Conference on Science and Technology of Synthetic Metals 2002, ShangHai, China, 29 June-5 July 2002. Abstract Code: ThuH115. "Electronic State of Nitrogen Containing Polypyridine at the Interfaces with Model Sulfonic Acid Containing Polymer and Molecule"
• APS March Meeting, Austin Texas, March 3 -7 2003. Abstract code: K18.010. "Effect of inter-ring torsion angle, protonation and vinyl group on electronic state of pyridine dimer"

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