Juhn S. Yoo, Ph.D.
734-936-0972
juhnsyoo@umich.edu

I'm a visiting scholar from LG.Philips LCD Korea and my research project is focused on developing an effective driving system for active matrix OLED employing amorphous silicon TFT technology. Designing a reliable AM-OLED requires a pixel electrode circuit that compensates for rather unstable current-voltage characteristics of a-Si:H TFTs. I received my BS, MS and PhD from Seoul National University in Korea.

Albert Lin
734-936-0972
shihchun@umich.edu

My current research is investigating photosensitivity of porphyrin materials. By measuring device I-V characteristics shift when they are under monochromatic illumination, we have the possibility to build porphyrin photosensor array. In addition, I study the stability issue of organic device when it is exposed to oxygen and water vapor. We want to find ways to alleviate device degradation due to oxygen doping, and also want to see the feasibility of porphyrin oxygen sensor. I receive my B.S. degree in electrical engineering department of National Chiao-Tung University, and I joined to OMEL in February 2006.

Peter Kyu Ahn
734-936-0972
ahnp@umich.edu

My research focuses on analysis and device parameter extraction for RPI a-Si TFT model, SPECTRE simulations of a-Si TFT devices using CADENCE, SPECTRE simulations of a-Si TFT AM-OLED circuits using CADENCE and PN junction device fitting to experimental OLED characteristic in SPECTRE.

Aaron Johnson
734-936-0972
arjohn@eecs.umich.edu

Aaron Johnson defended his thesis "White-Light Generation and OLED Lifetime Issues" in April of 2008. His research focused on three areas related to OLEDs for solid-state lighting: “The Generation of White Light by Forster Transfer Between Emissive Polymers”; “Encapsulation of OLEDs by PECVD-Deposited Inorganic Thin Films”; and “The Effect of Duty Cycle on Dark-Spot Growth in Pulsed-Voltage-Driven OLEDs”.

Hojin Lee
734-936-0972
hojinny@umich.edu

My research is mainly focusing on the development of a-Si:H TFT structures and pixel electrode circuits for Active-Matrix OLED displays. In specific, we studied the effect of electrode and channel structures on the electrical stabilities of a-Si:H TFTs and pixel electrode circuits. We have also researched on the dynamic behavior of fabricated a-Si:H TFT pixel electrode circuits as a function of storage and parasitic capacitors for AM-OLED applications. I am also interested in the fabrication and characterization of the white light emission PLEDs on plastic substrates for the solid-state light and flexible display applications. As a long term goal, I would like to develop flexible AM-OLED displays with the combined technologies of OTFT, PLED, and plastic substrates. I received both B.S and M.S in ECE from Hanyang University in Korea.

Daniel Cheng
734-936-0972
udx@umich.edu

My project focuses on the optimization of amorphous silicon. The goal of my research is to find the best device annealing condition that yields the best performance. My work involves device fabrication, characterization, evaluation and workstation construction. I am currently pursing my B.S. degree in EE and ME from University of Michigan.

Santhosh Kumar

My research during the three month summer internship is to create a working 2D model of an amorphous silicon thin-film transistor (TFT) using Sentaurus TCAD software. It is hoped that my model will be used in the future by members of the OME Lab to simulate the characteristics of the device using different materials. I received my B.S. in Electrical Engineering from the University of Michigan in 2006.

Sophie Maurice

I am student from the French IFIPS (Institut de Formation des Ingenieurs de Paris Sud) Engineering School in Materials Science. I joined the OMEL to do my required research internship during my second school year, from May to July 2006. During my stay in the OMEL, I studied the influence of silicon oxide surface treatment on the organic thin-film transistors (TFTs). Specifically, I focused my research work on the surface treatment with OTS. I applied this study to TBP, CuTBp and NiTBP. Finally, I completed my internship by extracting device data from electrical measurements to compare the influence of the OTS layer on all my transistors.

Dennis Feng

My summer research focuses on characterizing and simulating thin film transistors (TFT). I use UTMOST to extract SPICE parameters from different IV curves of TFTs measured in lab. I have developed two C++ programs to convert raw data into a UTMOST usable format. I am currently using SIMCAD Gateway to simulate a variety of pixel circuits using TFT parameters characterized in UTMOST. I received my B.S. degree in Electrical Engineering from the University of Michigan in 2008 and I will be enrolled in the Masters degree program this coming Fall term.

Alex Kuo

My project focuses on the characterization and optimization of the next generation amorphous silicon based active matrix display. I’m currently working on the evaluation of amorphous silicon thin-film-transistors (a-TFT) under various stressing conditions. By developing a better understanding of the mechanism that causes characteristics shift in a-TFT, we can potentially alleviate or even eliminate the problems by using better fabrication steps and materials along with superior circuits for the pixel electrode. The long term goal for this project is to apply this technology to low-cost, flexible substrate. I received my B.S. in electrical engineering and computer science from U.C. Berkeley, M.S. in electrical engineering and computer science from University of Michigan, and I’m currently in the Ph.D. program.