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
PRESENTATIONS AT CONFERENCES
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