Vapor-Phase Molecular Doping of Graphene for High-Performance Transparent Electrodes

被引:88
作者
Kim, Youngsoo [1 ,2 ]
Ryu, Jaechul [3 ,4 ,5 ]
Park, Myungjin [1 ]
Kim, Eun Sun [1 ]
Yoo, Je Min [1 ]
Park, Jaesung [6 ]
Kang, Jin Hyoun [1 ]
Hong, Byung Hee [1 ,4 ,5 ]
机构
[1] Seoul Natl Univ, Dept Chem, Seoul 151742, South Korea
[2] Seoul Natl Univ, Dept Phys & Astron, Seoul 151742, South Korea
[3] Samsung Techwin R&D Ctr, Micro Device & Machinery Solut Div, Songnam 463400, South Korea
[4] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol SAINT, Suwon 440746, South Korea
[5] Sungkyunkwan Univ, Ctr Human Interface Nano Technol HINT, Suwon 440746, South Korea
[6] Korea Res Inst Stand & Sci, Korea Ctr Nanometrol, Gajeong Ro 305340, Daejon, South Korea
基金
新加坡国家研究基金会;
关键词
graphene; chemical doping; vapor doping; FET; ethylene amine; FIELD-EFFECT TRANSISTORS; NITROGEN-DOPED GRAPHENE; SINGLE-LAYER GRAPHENE; LIGHT-EMITTING-DIODES; FILMS; DEPOSITION; SCATTERING; TRANSPORT; DOPANTS;
D O I
10.1021/nn405596j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Doping is an essential process to engineer the conductivity and work-function of graphene for higher performance optoelectronic devices, which includes substitutional atomic doping by reactive gases, electrical/electrochemical doping by gate bias, and chemical doping by acids or reducing/oxidizing agents. Among these, the chemical doping has been widely used due to its simple process and high doping strength. However, it also has an instability problem in that the molecular dopants tend to gradually evaporate from the surface of graphene, leading to substantial decrease in doping effect with time. In particular, the instability problem is more serious for n-doped graphene because of undesirable reaction between dopants and oxygen or water in air. Here we report a simple method to tune the electrical properties of CVD graphene through n-doping by vaporized molecules at 70 degrees C, where the dopants in vapor phase are mildly adsorbed on graphene surface without direct contact with solution. To investigate the dependence on functional groups and molecular weights, we selected a series of ethylene amines as a model system, including ethylene diamine (EDA), diethylene triamine (DETA), and triethylene tetramine (TETA) with increasing number of amine groups showing different vapor pressures. We confirmed that the vapor-phase doping provides not only very high carrier concentration but also good long-term stability in air, which is particularly important for practical applications.
引用
收藏
页码:868 / 874
页数:7
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