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

Neupane, P Gum and Tran, Minh Dao and Yun, Seok Joon and Kim, Hyun and Seo, Changwon and Lee, Jubok and Han, Gang Hee and Sood, A K and Kim, Jeongyong (2017) Simple Chemical Treatment to n-Dope Transition-Metal Dichalcogenides and Enhance the Optical and Electrical Characteristics. In: ACS APPLIED MATERIALS & INTERFACES, 9 (13). pp. 11950-11958.

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Official URL: http://dx.doi.org/10.1021/acsami.6b15239

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.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 20 May 2017 06:57
Last Modified: 20 May 2017 06:57
URI: http://eprints.iisc.ac.in/id/eprint/56951

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