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Long‐Term Stability Control of CVD‐Grown Monolayer MoS 2
Author(s) -
Şar Hüseyin,
Özden Ayberk,
Demiroğlu İlker,
Sevik Cem,
Perkgoz Nihan K.,
Ay Feridun
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201800687
Subject(s) - monolayer , materials science , thermal stability , vacancy defect , cracking , durability , electronics , stability (learning theory) , stress (linguistics) , nanotechnology , structural stability , chemical physics , fracture (geology) , composite material , chemical engineering , crystallography , chemistry , structural engineering , computer science , linguistics , philosophy , machine learning , engineering
The structural stability of 2D transition metal dichalcogenide (TMD) formations is of particular importance for their reliable device performance in nano‐electronics and opto‐electronics. Recent observations show that the CVD‐grown TMD monolayers are likely to encounter stability problems such as cracking or fracturing when they are kept under ambient conditions. Here, two different growth configurations are investigated and a favorable growth geometry is proposed, which also sheds light onto the growth mechanism and provides a solution for the stability and fracture formation issues for TMDs specifically for MoS 2 monolayers. It is shown that 18 months naturally and thermally aged MoS 2 monolayer flakes grown using specifically developed conditions, retain their stability. To understand the mechanism of the structural deterioration, two possible effective mechanisms, S vacancy defects and growth‐induced tensile stress, are assessed by the first principle calculations where the role of S vacancy defects in obtaining oxidation resistant MoS 2 monolayer flakes is revealed to be rather more critical. Hence, these simulations, time‐dependent observations and thermal aging experiments show that durability and stability of 2D MoS 2 flakes can be controlled by CVD growth configuration.