Chemical hole doping into large-area transition metal dichalcogenide monolayers using boron-based oxidant

Matsuoka, Hirofumi; Kanahashi, Kaito; Tanaka, Naoki; Shoji, Yoshiaki; Li, Lain-Jong; Pu, Jiang; Ito, Hiroshi; Ohta, Hiromichi; Fukushima, Takanori; Takenobu, Taishi

Chemical hole doping into large-area transition metal dichalcogenide monolayers using boron-based oxidant

Type

Article

Authors

Matsuoka, Hirofumi
Kanahashi, Kaito
Tanaka, Naoki
Shoji, Yoshiaki
Li, Lain-Jong

Pu, Jiang
Ito, Hiroshi
Ohta, Hiromichi
Fukushima, Takanori
Takenobu, Taishi

KAUST Department

Material Science and Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date

2018-01-18

Print Publication Date

2018-02-01

Date

2018-01-18

Abstract

Hole carrier doping into single-crystalline transition metal dichalcogenide (TMDC) films can be achieved with various chemical reagents. However, large-area polycrystalline TMDC monolayers produced by a chemical vapor deposition (CVD) growth method have yet to be chemically doped. Here, we report that a salt of a two-coordinate boron cation, Mes2B+ (Mes: 2,4,6-trimethylphenyl group), with a chemically stable tetrakis(pentafluorophenyl)borate anion, [(C6F5)4B]−, can serve as an efficient hole-doping reagent for large-area CVD-grown tungsten diselenide (WSe2) films. Upon doping, the sheet resistance of large-area polycrystalline WSe2 monolayers decreased from 90 GΩ/sq to 3.2 kΩ/sq.

Citation

Matsuoka H, Kanahashi K, Tanaka N, Shoji Y, Li L-J, et al. (2018) Chemical hole doping into large-area transition metal dichalcogenide monolayers using boron-based oxidant. Japanese Journal of Applied Physics 57: 02CB15. Available: http://dx.doi.org/10.7567/jjap.57.02cb15.

Acknowledgements

T.T. was partially supported by Grants-in-Aid from MEXT (JP26102012 "π-System Figuration", JP17H01069, JP16K13618, JP15K21721, and JP25000003). K.K. and J.P. acknowledge the Leading Graduate Program in Science and Engineering, Waseda University from the Ministry of Education, Culture, Sports, Science and Technology (MEST) of Japan. T.F. was supported by Grant-in-Aid for Scientific Research on Innovative Areas (JP26102008 "π-System Figuration") and "Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials" from MEXT. Y.S. was supported by the Asahi Glass Foundation. This work was also supported in part by the Network Joint Research Center for Materials and Devices.