Synthesis of multiphase MoS 2 heterostructures using temperature-controlled plasma-sulfurization for photodetector applications

• Published in: Nanoscale 2023-11, Vol.15 (43), p.17326-17334
• Main Authors: Aydin, Kubra, Kanade, Chaitanya, Kanade, Vinit Kaluram, Bahit, Gulgun, Ahn, Chisung, Kim, Taesung
• Format: Article
• Language: English
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/D3NR01910A

Two-dimensional (2D) materials exhibit outstanding performance in photodetectors because of their excellent optical and electronic properties. Specifically, 2D-MoS 2 , a transition metal dichalcogenide, is a prominent candidate for flexible and portable photodetectors based on its inherent phase-dependent tunable optical band gap properties. This research focused on creating high-performance photodetectors by carefully arranging out-of-plane 2D heterostructures. The process involved stacking different phases of MoS 2 (1T and 2H) using controlled temperature during plasma-enhanced chemical vapor deposition. Among the various phase combinations, the best photocurrent response was obtained for the 1T/2H-MoS 2 heterostructure, which exhibited an approximately two-fold higher photocurrent than the 2H/1T-MoS 2 heterostructure and 2H/2H-MoS 2 monostructure. The 1T/2H-MoS 2 heterostructure exhibited a higher photoresponse than the monostructured MoS 2 of the same thickness (1T/1T- and 2H/2H-MoS 2 , respectively). The effect of the stacking sequences of different phases was examined, and their photoperformances were investigated. This study demonstrates that phase engineering in 2D-MoS 2 van der Waals heterostructures has significant potential for developing high-performance photodetectors.