Jin Jang is a Chair Professor at Department of Information Display of Kyung Hee University. His current research programs are in oxide and LTPS TFTs for displays, TFT circuits and TFT application to sensors, Micro-LED and flexible AMOLED. He invented the first full color AMLCD on plastic substrate, flexible AMOLED and some new device structures using oxide semiconductors. He is the author or co-author of over 1,000 technical publications of which over 650 are in SCI Journals such as Nature, Advanced Materials, Advanced Functional Materials, Energy Environmental Science, Applied Physics Letters, IEEE Electron Device Letters and IEEE TED. He is currently a Director of Advanced Display Research Center (ADRC) and had served as Program Chair of SID Symposium 2007 and General Chair of SID Display Week in 2009 and General Chair of IMID 2012, 2013. He is a Fellow of SID and he was awarded George Smith Award from IEEE in 2012, Slotto Owaki Prize from SID in 2015, Jan Rajchman Prize in 2022 from SID and Ho-Am Award in 2017.

Plenary (16:30-17:10, 26th Aug, Zijin Lecture Hall (紫金报告厅))

Email: jjang@khu.ac.kr

ZnO Based Nanocrystalline Semiconductor for Thin-Film Transistors 

Jin Jang

Nanocrystalline ZnO is being used for display applications such as electron injection/transport layer of organic light-emitting diodes. We demonstrate high-quality ZnO nanocrystalline semiconductor by spray pyrolysis and its application to thin-film transistors (TFTs). A key issue for the spray coating is to get a bubble-free and dense material. The ammonium acetate (AA) addition in the oxide precursor solution, acting as a stabilizer, increases the solubility of the solution and enhances the film quality by reducing the defect density. With AA addition in ZnO precursor, the films are coffee ring free with high mass density and better grain orientation. The mobility could be improved to 70 cm2/Vs in ZnO based TFT. The ZnO/AlZnO/YZnO TFT shows a negligible Vth shift under temperature bias stress for 1 h at 60 °C and excellent environmental stability over a few months, which is due to the presence of stronger Y−O and Al−O bonds at the back surface. I will review our recent results on ZnO nanocrystalline based TFTs manufactured with spray pyrolysis [1]-[5]. The effect of alloys of Li, Gd, La on ZnO TFTs are also studied together with the Ar/O2 plasma exposure effect on the TFT performance[6]. 

References

[1] J.K. Saha, R.N. Bukke, N.N. Mude and J. Jang, Scientific Reports 2020, 10, 8999. 
[2] R.N. Bukke, J.K. Saha, N.N. Mude, Y. Kim, S. Lee, and J. Jang, ACS Appl. Mater. Interfaces 2020, 12, 35164.
[3]. M.M. Islam, J.K. Saha, M. M. Hasan, J. Kim,R.N.Bukke, A. Ali, and J. Jang, Adv. Mater. Interfaces 2021, 8, 2100600.
[4]. M.M. Hasan, Mohit, J.B. Bae, E. Tokumitsu, H.-Y. Chu, S.C. Kim and J. Jang, Appl. Phys. Lett. 2021, 119, 093502.
[5]. J.K. Saha, M.M. Billah, and Jin Jang, ACS Appl. Mater. Interfaces 2021, 13, 37350.
[6]. R.N. Bukke , N.N. Mude , Md. Islam and J. Jang, Applied Surface Science 2021, 568,150947.
 

Biography