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 Repjournal_title
Scientific reportsauthors
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 Ydoi
10.1038/srep19733subject
Has Abstractpub_date
2016-01-21 00:00:00pages
19733issn
2045-2322pii
srep19733journal_volume
6pub_type
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