Simultaneous Etching and Doping by Cu-Stabilizing Agent for High-Performance Graphene-Based Transparent Electrodes

Title
Simultaneous Etching and Doping by Cu-Stabilizing Agent for High-Performance Graphene-Based Transparent Electrodes
Authors
김상진류재철손수연유제민박종보원동관이은규조성표배수강조승민홍병희
Issue Date
2014-04
Publisher
Chemistry of materials
Citation
VOL 26, NO 7, 2332-2336
Abstract
Cu etching is one of the key processes to produce large-area graphene through chemical vapor deposition (CVD), which is needed to remove Cu catalysts and transfer graphene onto target substrates for further applications. However, the Cu etching method has been much less studied compared to doping or transfer processes despite its importance in producing higher quality graphene films. The Cu etchant generally includes a strong oxidizing agent that converts metallic Cu to Cu2+ in a short period of time. Sometimes, the highly concentrated Cu2+ causes a side reaction leading to defect formation on graphene, which needs to be suppressed for higher graphene quality. Here we report that the addition of metal-chelating agents such as benzimidazole (BI) to etching solution reduces the reactivity of Cu-etching solution by forming a coordination compound between BI and Cu2+. The resulting graphene film prepared by Cu stabilizing agent exhibits a sheet resistance as lows as ∼200 Ohm/sq without additional doping processes. We also confirmed that such strong doping effect is stable enough to last for more than 10 months under ambient conditions due to the barrier properties of graphene covering the BI dopants, in contrast to the poor stability of graphene additionally doped by strong p-dopant such as HAuCl4. Thus, we expect that this simultaneous doping and etching method would be very useful for simple and high-throughput production of large-area graphene electrodes with enhanced conductivity.
URI
http://pubs.kist.re.kr/handle/201004/49479
ISSN
08974756
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KIST Publication > Article
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