Seminar & Colloquium
[세미나: 9월 23일(금), 오후 4시] Adama Science and Technology University, 김정용 교수
Title
Polymer and Perovskite Semiconductors for Electronics and Optoelectronics
Speaker
김정용 교수, Department of Materials Science and Engineering, Adama Science and Technology University
Education
- Feb. 2004 Ph.D. in Chemical and Biomolecular Engineering, Organic Semiconductor and Device
Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea
- Feb. 1999 M.Sc. in Industrial Chemistry (Major in Polymer Engineering)
Hanyang University, Seoul, Korea
- Feb. 1997 B.Sc. in Industrial Chemistry in School of Engineering, Molecular Thermodynamics and Polymer Science
Hanyang University, Seoul, Korea
Professional Experience
- 2021.12 ~ Present Dean (Director), Adama Science and Technology University (Ethiopia), Center of Advanced Materials Science and Engineering
- 2021.10 ~ Present Professor, Adama Science and Technology University (Ethiopia), School of Mechanical, Chemical and Materials Engineering, Department of Materials Science and Engineering
- 2017.09 ~ 2021.07 Professor, Jimma University (Ethiopia), Jimma Institute of Technology, School of Chemical Engineering
- 2020.01 ~ 2021.02 Scientific Director, Jimma University (Ethiopia), Jimma Institute of Technology
- 2018.08 ~ 2018.09 Visiting Professor, Linköping University (Sweden), Dept. of Physics, Chemistry and Biology, Biomolecular and Organic Electronics Lab
- 2016.05 ~ 2017.09 Chair, Ceramics Engineering, Jimma University (Ethiopia), Jimma Institute of Technology, School of Materials Science and Engineering
- 2016.01 ~ 2017.09 Professor, Jimma University (Ethiopia), Jimma Institute of Technology, School of Materials Science and Engineering
- 2014.08 ~ 2015.12 Professor, Adama Science and Technology University (Ethiopia), Department of Materials Science and Engineering
- 2014.07 ~ 2014.09 Visiting Professor, Seoul National University (Korea), Department of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Organic Semiconductor Lab.
- 2012.10 ~ 2013.07 Department Head, Adama Science and Technology University (Ethiopia), Department of Materials Science and Engineering
- 2012.08 ~ 2014.07 Associate Professor, Adama Science and Technology University (Ethiopia), Department of Materials Science and Engineering
- 2010.03 ~ 2012.07 BK Assistant Professor, Seoul National University (Korea), Department of Materials Science and Engineering
- 2006.10 ~ 2010.02 Postdoctoral Research Associate, University of Minnesota-Twin Cities (USA), Department of Chemical Engineering and Materials Science
Advisor: Prof. C. Daniel Frisbie (Organic & Molecular Electronics)
- 2004.03 ~ 2006.05 Senior Engineer, Samsung Electronics (Korea), Liquid Crystal Display Division
- 2003.03 ~ 2004.02 Research Trainee, Korea Institute of Science and Technology (Korea), Optoelectronic Materials Research Center
- 2002.01 ~ 2002.12 Research Fellow, University of Texas at Austin (USA), Department of Chemistry and Biochemistry
Advisor: Prof. Allen J. Bard (Electrochemistry)
- 1999.06 ~ 2000.01 Commissioned Research Scientist, Korea Institute of Science and Technology (Korea), Facilitated Transport Membrane Center
| Date | Friday, September 23rd, 2022
| Time | 16:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
Solution-processable polymer semiconductor and organometal halide perovskite are new class of semiconductors for electronics, optoelectronics and bioelectronics with versatile applications such as photovoltaic (PV) solar cells, photodetectors, lasers, light-emitting diodes (LEDs), field-effect transistors (FETs), neuromorphic sensors, etc. In this talk, we will briefly review the history of organic semiconductors and then describe the special properties of perovskite semiconductors compared to organic π-bonded solids with sp2pz hybridization. Basically, this talk is about the three major applications of organic/perovskite electronics, i.e., PVs, FETs, and LEDs. Firstly, we will talk about PV polymer blends with special attention to the phase separation phenomena affecting the structure and properties (e.g., charge mobility in a FET testbed) of blends. Secondly, we will study the perovskite solar cells entitled “Hydrophilic Surface-Driven Crystalline Grain Growth of Perovskites on Metal Oxides”. Here, we will report the crystalline grain growth mechanism of CH3NH3PbI3 depending on the hydrophilicity of charge transport layers (CTLs), e.g., compact-TiO2, mesoporous-TiO2, SnO2, and NiOx. Then, we will observe the correlation between the microstructural morphologies and PV performances. Thirdly, we will shortly discuss about the emerging quasi two-dimensional (2D) perovskite LEDs (PeLEDs) with quantum-/dielectric-confinement effects. Note that 2D perovskites have a general formula of L2(SMX3)n-1MX4, where M, X, L, and S are a divalent metal cation, a halide and (organic) cations with long and short chains, respectively. Here, <n> is equal to the number of MX6 monolayer sheets within a layer. In general, quasi-2D perovskites have a mixture of several <n> monolayers. In this work, we will focus on the PeLEDs incorporating a green-emitting Ruddlesden-Popper structure. Finally, we may reach a conclusion that polymer and perovskite semiconductors are promising for next generation energy and display materials and devices.
| Host | Prof. Woong-Ryeol Yu (880-9299)