''Surface-Directed Molecular Assembly of Organic Semiconductors for High-Performance Organic Electronics'' Kilwon Cho

This seminar will be followed by Prof. Tae-Woo Lee’s seminar ''Organic/inorganic perovskite optoelectronics using self-organized polymeric buffer layers'' with a short break.

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Date:   Friday, January 23^rd, 2015

Time:   14:30-15:30

Venue:  C016, Lab1

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Speaker:

Prof. Kilwon Cho

Department of Chemical Engineering

Pohang University of Science and Technology (POSTECH), Republic of Korea

Title:

Surface-Directed Molecular Assembly of Organic Semiconductors for High-Performance Organic Electronics

Abstract:

Microstructure in organic semiconductor thin films has been regarded as the key factor determining the performance of the organic electronics. In the case of organic field effect transistors (OFETs) and organic photovoltaics (OPVs), the control of the surface characteristics of underlying substrates can govern the mesoscale and/or nanoscale ordering of the semiconductor assembled on them. Here, we present various approaches for controlling the growth of organic semiconductors on gate dielectrics and electrodes to achieve high performance OFETs and OPVs.

1. H. S. Lee et al., J. Am. Chem. Soc. 130, 10556 (2008)

2. W. H. Lee et al., J. Am. Chem. Soc. 133, 4447 (2011)

3. W. H. Lee et al., Adv. Mater. 23, 1752 (2011).

4. B. Kang et al., Nat. Commun. 5, 4752 (2014)

Biography:

Education

BS   Applied Chemistry, Seoul National University (1980)           

MS   Applied Chemistry, Seoul National University (1982)

Ph.D.  Polymer Science, The University of Akron (1986)

Professional Appointments

1986 - 1987   Postdoctoral Fellow, University of Akron

1987 - 1988   Visiting Scientist, IBM Research Center

1988 -        Professor, POSTECH

1993 - 1993   Visiting Professor, Tokyo Institute of Technology

2005 -        Director, Polymer Research Institute, POSTECH

2011 -        Director, Global Frontier Research Center for Advanced Soft Electronics

2015         Senior Vice President (President-Elect), The Polymer Society of Korea

Honors and Awards

-             Fellow, The Korean Academy of Science and Technology

-             Best Paper Award, The Korean Federation of Science and Technology Societies(1999)

-             Outstanding Research Award, The Polymer Society of Korea (2004)

-             NanoKorea Award, Ministry of Science and Technology, Korea (2008)

-             Proud Postechian Award (POSTECH, 2009)

-             Lee, D. Y. Award ( Pohang Accelerator Laboratory , 2009)

-             Scientist of the Month Award (The Ministry of Edu. Sci. Tech., 2010)

-             Lee, J. Y. Chair Professor (2011)

Recent Publications

1. Enhancing 2D Growth of Organic Semiconductor Thin Films with Macro porous Structures via a Small-Molecule Heterointerface, Nat. Commun. 5, 4752, 2014 
2. 25th Anniversary Article: Microstructure Dependent Bias Stability of Organic Transistors, Adv. Mater., 26, 1660, 2014
3. Electrical Performance of Organic Solar Cells with Additive-Assisted Vertical Phase Separation in the Photoactive Layer,  Adv. Energy Mater., 4, 1300612, 2014
4. Side-Chain Engineering for Fine-Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells, Adv. Energy Mater. 4, 1400087, 2014,
5. Decoupling the Bias-Stress-Induced Charge Trapping in Semiconductors and Gate-Dielectrics of Organic Transistors Using a Double Stretched-Exponential Formula, Adv. Funct. Mater., 23, 690, 2013
6. Single-Gate Bandgap Opening of Bilayer Graphene by Dual Molecular Doping, Adv. Mater., 24, 407, 2012
7. Surface-Directed Molecular Assembly of Pentacene on Monolayer Graphene for High-Performance Organic Transistors, J. Am. Chem. Soc. 133, 4447, 2011 

Host:

Prof. Yabing Qi