Simple Chemical Treatment to n-Dope Transition-Metal Dichalcogenides and Enhance the Optical and Electrical Characteristics

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Title
Simple Chemical Treatment to n-Dope Transition-Metal Dichalcogenides and Enhance the Optical and Electrical Characteristics
Author(s)
Guru P. Neupane; Minh Dao Tran; Seok Joon Yun; Hyun Kim; Changwon Seo; Jubok Lee; Gang Hee Han; A. K. Sood; Jeongyong Kim
Publication Date
2017-04
Journal
ACS APPLIED MATERIALS & INTERFACES, v.9, no.13, pp.11950 - 11958
Publisher
AMER CHEMICAL SOC
Abstract
The optical and electrical properties of monolayer transition-metal dichalcogenides (1L-TMDs) are critically influenced by two dimensionally confined exciton complexes. Although, extensive studies on controlling the optical properties of 1L-TIVIDs through external doping or defect engineering have been carried out, the effects of excess charges, defects, and the populations of exciton complexes on the light emission of 1L-TMDs are not yet fully understood. Here, we present a simple chemical treatment method for n dope 1L-TMDs, which also enhances their optical and electrical properties. We show that dipping lLs of MoS2 WS2, and WSe2, whether exfoliated or grown'y chemical vapor deposition, into methanol for several hours can increase the electron density and also can reduce the defects, resulting in the enhancement of their photoluminescence, light absorption, and the carrier mobility:. This methanol treatment was effective for both n- and p-type 1L-TMDs, suggesting that the surface restructuring around structural defects by methanol is responsible for the enhancement of optical and electrical characteristics. Our results have revealed a simple process for external doping.that can enhance both the optical and electrical properties of 1L-TMDs and help us understand how the exciton emission in 1L-TMDs can be modulated by chemical treatments. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3736
ISSN
1944-8244
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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