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2017.03.31 13:48

[Thu. 30 Mar. 2017] Prof. Jeong Ho Cho/SKKU Advanced Institute of Nanotechnology (SAINT), School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea

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Speaker Prof. Jeong Ho Cho
Date Thu. 30 Mar. 2017
Time 5:00pm
Venue #633, Asan Hall, College of Science

“POLYELECTROLYTE-GATED VERTICAL

SCHOTTKY-BARRIER TRANSISTORS”

 

 

We demonstrate a new device architecture for flexible vertical Schottky barrier (SB) transistors and logic gates based on graphene–organic semiconductor–metal heterostructures and ion gel gate dielectrics. The vertical SB transistor structure was formed by (i) vertically sandwiching a benchmark p-type pentacene or n-type N,N’-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) organic semiconductor layer between graphene (source) and metal (drain) electrodes and (ii) employing a separate coplanar gate electrode bridged with the vertical channel through an ion gel. The channel current was modulated by tuning the Schottky barrier height across the graphene–organic semiconductor junction under an applied external gate bias. The high specific capacitance of the ion gel gate dielectrics enabled the work function of the graphene to be readily modulated using a voltage below 1 V. Consequently, the devices showed well-behaved p- and n-type characteristics under low-voltage operation (< 1 V), yielding high current densities (> 100 mAcm–2) and on–off current ratios (> 103). The simple structure of the unit transistor enabled successful fabrication of low-power logic gates based on assemblies of devices such as the complementary inverter, NAND, and NOR circuits on a plastic substrate. The simple, scalable, and room-temperature deposition of both organic semiconductors and gate dielectrics integrated with transparent and flexible graphene opens up new opportunities for realizing future transparent, flexible, and low-power organic electronics.

 

Prof. Jeong Ho Cho

SKKU Advanced Institute of Nanotechnology (SAINT), School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea


List of Articles
No. Subject Speaker Date
Notice Spring semester 2017 Seminar Schedule file - -
33 [Wed. 5 July. 2017] Seminar was canceled! - -
32 [Wed. 28 Dec. 2016] Prof. James Y. Hamilton/Development of a Broad Range of Asymmetric C–C Bond Forming Reactions with a Versatile Iridium Catalyst file Prof. James Y. Hamilton Wednesday 28 December 2016
31 [Thu. 9 Mar. 2017] Prof. Woon Ju Song/Department of Chemistry, Seoul National University, Seoul, Korea Prof. Woon Ju Song Thu. 9 Mar. 2017
30 [Thu. 9 Jun. 2016] Prof. Yong-Young Noh/Development of Printed Large Area Organic Transistors and Integrated Circuits Prof. Yong-Young Noh Thursday 9 June 2016
29 [Thu. 8 Sep. 2016] Prof. Jaeyoung Sung/Stochastic chemical dynamics in living cells and its consequence for the control capacity of living cells over biological functions Prof. Jaeyoung Sung Thursday 8 September 2016
28 [Thu. 8 Jun. 2017] Prof. Won-jin Chung/Department of Chemistry, GIST, Gwangju, Republic of Korea Prof. Won-jin Chung Thu. 8 Jun. 2017
27 [Thu. 6 Oct. 2016] Prof. Young S. Park/Atomistic Molecular Engineering of Polycyclic Aromatic Hydrocarbons Prof. Young S. Park Thursday 6 October 2016
26 [Thu. 6 Apr. 2017] Prof. Rong-Jie Chein/Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan Prof. Rong-Jie Chein Thu. 6 Apr. 2017
» [Thu. 30 Mar. 2017] Prof. Jeong Ho Cho/SKKU Advanced Institute of Nanotechnology (SAINT), School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea Prof. Jeong Ho Cho Thu. 30 Mar. 2017
24 [Thu. 3 Nov. 2016] Prof. Min-Sik Kim/Mass spectrometry and its applications to Biological Discovery Prof. Min-Sik Kim Thursday 3 November 2016
23 [Thu. 29 Sep. 2016] Prof. Tae-Young Yoon/Observation of Single Membrane Proteins under Mechanical Tension Prof. Tae-Young Yoon Thursday 29 September 2016
22 [Thu. 27 Apr. 2017] Seminar was canceled! - -
21 [Thu. 26 Jun. 2016] Prof. Sung June Cho/Structural Elucidation of Novel Zeolite by Dual Space Approaches Using X-ray Powder Diffraction Prof. Sung June Cho Thursday 26 May 2016
20 [Thu. 25 May. 2017] Prof. Wonsuk Kim/Department of Chemistry and Nano Science, Ewha Womans University, Seoul Prof. Wonsuk Kim Thu. 25 May. 2017
19 [Thu. 23 Mar. 2017] Prof. Sangsu Bae/Department of Chemistry, Hanyang University, Seoul, South Korea Prof. Sangsu Bae Thu. 23 Mar. 2017
18 [Thu. 22 Sep. 2016] Prof. Anna Lee/Organocatalyzed Asymmetric Reactions Prof. Anna Lee Thursday 22 September 2016
17 [Thu. 20 Oct. 2016] Prof. Chan Hyuk Kim/Novel Small Molecule-based Approaches for Cancer Immunotherapy Prof. Chan Hyuk Kim Thursday 20 October 2016
16 [Thu. 2 Jun. 2016] Prof. Sunkyu Han/Total Syntheses of Complex Alkaloids Inspired by Biosynthetic Hypotheses Prof. Sunkyu Han Thursday 2 June 2016
15 [Thu. 19 May. 2016] Prof. Zhuang Liu/Nanotechnology for enhanced cancer radiation therapy and immunotherapy Prof. Zhuang Liu Thursday 19 May 2016
14 [Thu. 18 May. 2017] Student Host Colloquium : 1,1-Bisborylalkane: New Class of Organoboron Compound for the Chemo, Regio and Stereoselective Organic Transformations Prof. Seung Hwan Cho Thu. 18 May. 2017
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