Metallic conduction induced by direct anion site doping in layered SnSe2.

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 SnSe2 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 SnSe2. 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 SnSe2.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kim SI,Hwang S,Kim SY,Lee WJ,Jung DW,Moon KS,Park HJ,Cho YJ,Cho YH,Kim JH,Yun DJ,Lee KH,Han IT,Lee K,Sohn Y

doi

10.1038/srep19733

subject

Has Abstract

pub_date

2016-01-21 00:00:00

pages

19733

issn

2045-2322

pii

srep19733

journal_volume

6

pub_type

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