Metallic conduction induced by direct anion site doping in layered SnSe 2

Sang Il Kim, Sungwoo Hwang, Se Yun Kim, Woo Jin Lee, Doh Won Jung, Kyoung Seok Moon, Hee Jung Park, Young Jin Cho, Yong Hee Cho, Jung Hwa Kim, Dong Jin Yun, Kyu Hyoung Lee, In Taek Han, Kimoon Lee, Yoonchul Sohn

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Abstract

The emergence of metallic conduction in layered dichalcogenide semiconductor materials by chemical doping is one of key issues for two-dimensional (2D) materials engineering. At present, doping methods for layered dichalcogenide materials have been limited to an ion intercalation between layer units or electrostatic carrier doping by electrical bias owing to the absence of appropriate substitutional dopant for increasing the carrier concentration. Here, we report the occurrence of metallic conduction in the layered dichalcogenide of SnSe 2 by the direct Se-site doping with Cl as a shallow electron donor. The total carrier concentration up to ∼10 20 cm ' '3 is achieved by Cl substitutional doping, resulting in the improved conductivity value of ∼170 S·cm ' '1 from ∼1.7 S·cm ' '1 for non-doped SnSe 2. When the carrier concentration exceeds ∼10 19 cm ' '3, the conduction mechanism is changed from hopping to degenerate conduction, exhibiting metal-insulator transition behavior. Detailed band structure calculation reveals that the hybridized s-p orbital from Sn 5s and Se 4p states is responsible for the degenerate metallic conduction in electron-doped SnSe 2.

Original languageEnglish
Article number19733
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Jan 21

All Science Journal Classification (ASJC) codes

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    Kim, S. I., Hwang, S., Kim, S. Y., Lee, W. J., Jung, D. W., Moon, K. S., Park, H. J., Cho, Y. J., Cho, Y. H., Kim, J. H., Yun, D. J., Lee, K. H., Han, I. T., Lee, K., & Sohn, Y. (2016). Metallic conduction induced by direct anion site doping in layered SnSe 2. Scientific reports, 6, [19733]. https://doi.org/10.1038/srep19733