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나노 구조 물리 연구단
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Local Strain Induced Band Gap Modulation and Photoluminescence Enhancement of Multilayer Transition Metal Dichalcogenides

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Title
Local Strain Induced Band Gap Modulation and Photoluminescence Enhancement of Multilayer Transition Metal Dichalcogenides
Author(s)
Krishna P. Dhakal; Shrawan Roy; Houk Jang; Xiang Chen; Won Seok Yun; Hyunmin Kim; JaeDong Lee; Jeongyong Kim; Jong-Hyun Ahn
Publication Date
2017-06
Journal
CHEMISTRY OF MATERIALS, v.29, no.12, pp.5124 - 5133
Publisher
AMER CHEMICAL SOC
Abstract
The photocarrier relaxation between direct and indirect band gaps along the high symmetry K-Gamma line in the Brillion zone reveals interesting electronic properties of the transition metal dichalcogenides (TMDs) multilayer films. In this study, we reported on the local strain engineering and tuning of an electronic band structure of TMDs multilayer films along the K-Gamma line by artificially creating one-dimensional wrinkle structures. Significant photoluminescence (PL) intensity enhancement in conjunction with continuously tuned optical energy gaps was recorded at the high strain regions. A direct optical band gap along K-K points and an indirect optical gap along Gamma-K points measured from the PL spectra of multilayer samples monotonically decreased as the strain increased, while the indirect band gap along Lambda-Gamma was unaffected owing to the same level of local strain in the range of 0%-2%. The experimental results of band gap tuning were in agreement with the density functional theory calculation results. Local strain modified the band structure in which K-conduction band valley (CBV) was aligned below the Lambda-CBV, and this explained the observed local PL enhancement that made the material indirect via the K-Gamma transition. The study also reported experimental evidence for the funneling of photogenerated excitons toward regions of a higher strain at the top of the wrinkle geometry. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3675
ISSN
0897-4756
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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