* Obtained lawful permanent residence (LPR, or "Green Card")  in the U. S. on September 11, 2008

RESEARCH INTEREST

• Organic photovoltaic (OPV) devices
• Organic thin-film transistor (OTFT) 
• High-k organic dielectric film for OTFTs (by collaboration with Prof. Richard B. Timmons at the University of Texas at Arlington)
• Nonvolatile/volatile memory elements based on organic devices
• Organic light-emitting diodes (OLED)

AWARDS AND HONORS 

• Best Poster Award at 34th IEEE Photovoltaic Specialists Conference (PVSC) at Philadelphia, PA 2009

• OSU Presidential Fellowship, by the Ohio State University, OH 2008

• Paper Honorable Mention 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.

EDUCATION

6/2006 – Present            The Ohio State University, Columbus, OH, Expected graduation: December 2009

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

3/2004 – 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. S. in Metallurgical Engineering (Prof. Young-Hyun Paik as a thesis advisor)

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

·         B. S. 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 Engineer, 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 Republic of

                                  Korea Army,

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].

TECHNICAL EXPERTISE

• Solar cell design, fabrication, testing, and modeling: Single and multi-junction cells, plasmon-enhanced cell; I-V, C-V, and EQE testing; Process and device simulation

• LED design, fabrication, testing, and modeling: OLED from fluorescent polymers, NIR OLED from fluorescent dopants and electrophosphorescence; L-I-V, electroluminescence (EL), responsivity, device life test, C-V, and EQE testing; Process and device simulation

• Thin-film techniques: Solution-process (e.g. organic semiconducting material), thermal and e-beam evaporation (e.g. metal oxides), and atomic layer deposition (e.g. high-k metal oxides)

• Material characterization: AFM, SEM, TEM, Ellipsometer, UV-vis spectrometer and PL

• Device design, testing, and modeling: PVs, LEDs, TFTs, and photodetector

• IC processing techniques: Doping, evaporation, sputtering, one-micron lithography, basic e-beam, lithography, Piranah wafer clean, reactive ion / plasma etching

• Vacuum techniques: Construction, leak testing, and maintenance methodology; Use and maintenance of both dry and oil-based UHV and HV pumps and MBraun glovebox

• Math packages: Matlab, Origin, and Mathematica

• Software applications: Silvaco, LEdit, LabView and Microsoft Office

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). [Additionally, selected for republication in the Virtual Journal of Nanoscale Science & Technology (January 21, 2008)]

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, Kyung-Young Jung, Fernando L. Teixeira, Paul R. Berger, Jiwen Liu, Thirumalai Duraisamy, Rao Revur and Suvankar Sengupta, “Efficient Poly(3-hexylthiophene)-Fullerene Derivative Bulk Heterojunction Photovoltaic Devices using Unique Self-assembled Layer of Ag Nanoparticles with Controllable Particle-to-particle Spacing” 34th IEEE Photovoltaic Specialists Conference (PVSC), June 2009, Philadelphia, PA

 Woo-Jun Yoon, Yagnaseni Ghosh, Carly R. Reed, Yao Liu, Malcolm H. Chisholm, Claudia Turro and Paul R. Berger, “Efficient Organic Bulk Heterojunction Solar Cells through Near Infrared Absorbing Metallated Thiophene Complexes”, 34th IEEE Photovoltaic Specialists Conference (PVSC), June 2009, Philadelphia, PA [Best Poster Award]

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 Mention]

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)

Professional References

Available upon request