Tunable Charge Injection via Solution-Processed Reduced Graphene Oxide Electrode for Vertical Schottky Barrier Transistors
- Authors
- Choi, Young Jin; Kim, Jong Su; Cho, Joon Young; Woo, Hwi Je; Yang, Jeehye; Song, Young Jae; Kang, Moon Sung; Han, Joong Tark; Cho, Jeong Ho
- Issue Date
- Feb-2018
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.30, no.3, pp.636 - 643
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 30
- Number
- 3
- Start Page
- 636
- End Page
- 643
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/32025
- DOI
- 10.1021/acs.chemmater.7b03460
- ISSN
- 0897-4756
- Abstract
- We demonstrate, for the first time, the use of a solution-processed reduced graphene oxide (rGO) layer as a work function tunable electrode in vertical Schottky barrier (SB) transistors. The rGO electrodes were deposited by simple spray-coating onto the substrate. The vertical device structure was formed by sandwiching a N,N'-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C-8) organic semiconductor between rGO and Al electrodes. By varying the voltage applied to the gate electrode, the work function of rGO and thus the SB formed at the rGO-PTCDI-C-8 interface could be effectively modulated. The resulting vertical SB transistors based on rGO-PTCDI-C-8 heterostructures exhibited excellent electrical properties, including a maximum current density of 17.9 mA/cm(2) and an on-off current ratio >10(3), which were comparable with the values obtained for the devices based on a CVD-grown graphene electrode. The charge injection properties of the vertical devices were systematically investigated through temperature-dependent transport measurements. Charge injection was dominated by thermionic emission at high temperature. As the temperature decreased, however, impurity state-assisted hopping occurred. At low temperature and negative gate voltage, the reduced width of barrier induced by a high drain voltage yielded Fowler-Nordheim tunneling at the interface. The use of scalable solution-processed rGO as a work function tunable electrode in vertical SB transistors opens up new opportunities for realizing future large-area flexible two-dimensional materials-based electronic devices.
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