RESEARCH INTERESTS

• Polymer-fullerene derivatives bulk heterojunction photovoltaic (PV) devices
• Solution-processed organic thin-film transistor (OTFT) 
• Plasma polymerized high-k dielectric for OTFTs (by collaboration with Prof. Richard B. Timmons at the University of Texas at Arlington)
• Nonvolatile memory elements based on solution-processed organic devices
• Solution-processed organic light-emitting diodes (OLED)

EDUCATION

7/2006 – present            The Ohio State University, Columbus, OH

·         Ph. D.  in Electrical and Computer Engineering (Prof. Paul R. Berger as a dissertation advisor), GPA (3.82/4.0)

9/2004 – 6/2006            The Ohio State University, Columbus, OH

·         M. S. in Electrical and Computer Engineering (Prof. Paul R. Berger as a thesis advisor), GPA (3.84/4.0)

3/1999 – 2/2001            Korea University, Seoul, Korea

·         M. E. in Metallurgical Engineering (Prof. Young-Hyun Paik as a thesis advisor)

3/1995 – 2/1999            Korea University, Seoul, Korea

·         B. E. in Metallurgical Engineering

PROFESSIONAL EXPERIENCE

3/2004 - present         Graduate Research Associate, Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH

3/2005 - 3/2007          Graduate Teaching Associate, Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH

                                    ECE432 Physics of Semiconductor Devices (Sp05)
ECE637 Solid State Microelectronics Laboratory I (Au05)
ECE331 Introduction to Materials for Electrical & Computer Engineering (Wi06)
ECE432 Physics of Semiconductor Devices / ECE331 Intro. to Materials for Elec.& Comp.Eng. (Sp06)
ECE637 Solid State Microelectronics Laboratory I (Au06)
ECE205 Introduction to Circuit Analysis / ECE331 Intro. to Materials for Elec.& Comp.Eng. (Wi07)

3/2003 - 3/2004          Research Associate, Material Research Team, Research and Technology Center, Hyundai Steel Company (formerly known as INI Steel Company), Incheon, Korea

1/2001 - 3/2003         Aviation Life Support Equipments (ALSE) Technician, the 2-52^nd Aviation Regiment, the 17th Aviation Brigade,  Pyongtaek, Korea; Selected for Korean Augmentation to the United States Army (KATUSA) program as mandatory service in the armed forces in Korea

3/1999 - 2/2001         Graduate Research/Teaching Associate, Department of Metallurgical Engineering, Korea University, Seoul, Korea

PATENTS

Paul R. Berger and Woo-Jun Yoon, “Demonstration of Room Temperature Negative Differential Resistance in Polymer Diodes Using a Thin Oxide Tunneling Barrier at the Anode,” [Full patent filed November 3, 2006, Serial. No. & Code 11/592,419].

PEER-REVIEWED PUBLICATIONS

Woo-Jun Yoon, Scott B. Orlove, Robert L. Olmon, and Paul R. Berger, "Enhanced Emission Using Thin Li-Halide Cathodic Interlayers for Improved Injection into Poly(p-phenylene vinylene) Derivative PLEDs," Electrochemical and Solid-State Letters, 11, J76 (August 4, 2008).

Dhiman Bhattacharyya*, Woo-Jun Yoon*, Paul R. Berger and Richard B. Timmons,"Plasma Polymerized Multistacked Organic Bipolar Films: A New Approach to Flexible High–κ Dielectrics,"  Advanced Materials, 20, 2383 (June 18, 2008). [*: contributed equally to this work]

Woo-Jun Yoon and Paul R. Berger "4.8% efficient poly(3-hexylthiophene)-fullerene derivative (1:0.8) bulk heterojunction photovoltaic devices with plasma treated AgO_x/indium tin oxide anode modification ," Applied Physics Letters, 92, 013306 (January 07, 2008).

[Has been selected for the January 21, 2008 issue of Virtual Journal of Nanoscale Science & Technology]

Woo-Jun Yoon, Sung-Yong Chung, Paul R. Berger, and Sita M. Asar, "Room Temperature Negative Differential Resistance in Polymer Tunnel Diodes using a Thin Oxide Layer at the Anode and Demonstration of Threshold Logic," Applied Physics Letters, 87, 203506 (November 14, 2005).

Young-Hyun Paik, Woo-Jun Yoon, and Ho-Chul. Shin, "Static electrification of solid oxide in liquid metal and electrical double layer at the interface," Journal of Colloid and Interface Science, 269, 354 (January 15, 2004).

Young-Hyun Paik, Jang-Ho Pan and Woo-Jun Yoon, "Charging phenomena at the metal oxide-liquid metal interfaces and determination of excess electron density of metal oxide-mercury systems by the induced emf method," Journal of Colloid and Interface Science, 244, 444 (December 15, 2001).

PRESENTATIONS IN SYMPOSIUMS AND CONFERENCES

Woo-Jun Yoon and Paul R. Berger, "Polymer-Fullerene Bulk Heterojunction Photovoltaic Devices for Efficient Solar Energy Conversion on a Low-

Cost, Flexible Substrate", 6th International Energy Conversion Engineering Conference (IECEC) at Cleveland, OH (July 28-30, 2008) [Invited

presentation]

Woo-Jun Yoon and Paul R. Berger, “Surface modifications to the indium tin oxide (ITO) anodes through plasma oxidized silver for efficient poly(3-

hexylthiophene)-fullerene derivative (1:0.8) bulk  heterojunction photovoltaic devices", 33rd IEEE Photovoltaic Specialists Conference at San Diego,

CA (May 11–16, 2008). [Paper Honorable mentions]

Woo-Jun Yoon and Paul R. Berger, “Polymer-Fullerene Bulk Heterojunction Photovoltaic Devices for Efficient Solar Energy Conversion on a Low-

Cost, Flexible Substrate”, University Clean Energy Alliance of Ohio (UCEAO) Workshop on Green Industrialization at Columbus, OH (April 24,

2008).

Woo-Jun Yoon, Andrew P. Bonifas, Richard L. McCreery, and Paul R. Berger, “Resonant Tunneling and Room Temperature Negative Differential

Resistance in TiO₂/MEH-PPV Junctions for Quantum Functional Circuits”, Organic Photonics and Electronics (OPE) Topical Meeting of the 90th

OSA Annual Meeting at Rochester, NY (October 9-11, 2006).

Woo-Jun Yoon, Scott B. Orlove and Paul R. Berger, "Enhanced Light Emission using Thin Metal-Halide Cathodic Interlayers for Improved Electron Injection into MEH-PPV Polymer Light-Emitting Diodes," Fall 2005 MRS Meeting, Symposium I: Interfaces in Organic and Molecular Electronics II in Boston, MA (November 28 - December 2, 2005).

Woo-Jun Yoon and Young-Hyun. Paik, "Determination of electrical property of oxide in Gallium by the induced electromotive force method,"  Spring 2000  Korea Institute of Metals and Materials Meeting in Korea (April 27- April 29, 2000).

PROFESSIONAL MEMBERSHIPS

• Material Research Society (MRS) (2004-Present)

• Optical Society of America (OSA) (2004-Present)

• Institute of Electrical and Electronics Engineers (IEEE) (2004-Present)

• American Society for Engineering Education (ASEE) (2004-Present)

HONORS 

• Paper honorable mentions at 33rd IEEE Photovoltaic Specialists Conference (PVSC) at San Diego, CA 2008

• Nominee’s for the Graduate Associate Teaching Award, by The Ohio State University, Columbus, OH 2006.

• Nominee’s for the Graduate Associate Teaching Award, by The Ohio State University, Columbus, OH 2005.