Enhanced Electrical Performance of Monolayer MoS2 with Rare Earth Element Sm Doping

Abstract

Rare earth (RE) element-doped two-dimensional (2D) transition metal dichalcogenides (TMDCs) with applications in luminescence and magnetics have received considerable attention in recent years. To date, the effect of RE element doping on the electronic properties of monolayer 2D-TMDCs remains unanswered due to challenges including the difficulty of achieving valid monolayer doping and introducing RE elements with distinct valence and atomic configurations. Herein, we report a unique strategy to grow the Sm-doped monolayer MoS2 film by using an atmospheric pressure chemical vapor deposition method with the substrate face down on top of the growth source. A stable monolayer triangular Sm-doped MoS2 was achieved. The threshold voltage of an Sm-doped MoS2-based field effect transistor (FET) moved from −12 to 0 V due to the p-type character impurity state introduced by Sm ions in monolayer MoS2. Additionally, the electrical performance of the monolayer MoS2-based FET was improved by RE element Sm doping, including a 500% increase of the on/off current ratio and a 40% increase of the FET’s mobility. The electronic property enhancement resulted from Sm doping MoS2, which led internal lattice strain and changes in Fermi energy levels. These findings provide a general approach to synthesize RE element-doped monolayer 2D-TMDCs and to enrich their applications in electrical devices.

Strategies to improve electrocatalytic performance of MoS2-based catalysts for hydrogen evolution reactions

“…In order to synthesize MoS 2 , many strategies have been developed, including mechanical exfoliation, [81][82][83] solution exfoliation, [84][85][86] chemical vapor deposition [87][88][89] (CVD), hydrothermal synthesis, [90][91][92] electrodeposition methods, [93][94][95] metal-organic chemical vapor deposition (MOCVD), [96][97][98] and molecular beam epitaxy (MBE). [99][100][101] These methods can be classied as topdown methods (including mechanical exfoliation and solution exfoliation) and bottom-up methods (including hydrothermal synthesis, CVD, MOCVD and MBE).…”

Dopant‐Induced Giant Photoluminescence of Monolayer MoS2 by Chemical Vapor Transport

“…Compared with chemical vapor deposition [20,21,25] and molecular beam epitaxy (MBE) methods, [26,27] chemical vapor transport (CVT) is a traditional crystal growth technique to facilitate the growth of TMDCs bulk crystals for the exfoliation of their 2D counterparts. Jiao et al extended from growing 3D crystals to synthesizing various high-quality 2D atomic layers by tuning the growth kinetics using CVT method, [28][29][30][31] This approach is advantageous due to its high quality, large area, high throughput, and low growth temperature, [29] However, up to date, in situ doping of 2D semiconductors using the CVT technique has not been reported.…”

“…Compared with chemical vapor deposition [ 20,21,25 ] and molecular beam epitaxy (MBE) methods, [ 26,27 ] chemical vapor transport (CVT) is a traditional crystal growth technique to facilitate the growth of TMDCs bulk crystals for the exfoliation of their 2D counterparts. Jiao et al.…”

Plasmonic MXene Nanoparticle-Enabled High-Performance Two-Dimensional MoS2 Photodetectors

“…Two-dimensional (2D) materials show excellent electrical and optical characteristics, making them promising candidates in the field of photodetection. − Particularly, 2D molybdenum disulfide (MoS 2 ) possesses a desirable direct band gap and stronger photon–electron interaction in the visible spectrum. However, 2D MoS 2 synthesized using the chemical vapor deposition (CVD) method easily contains numerous surface defects, resulting in a poor device performance, such as low responsivity and field effect mobility. − To date, various methods have been developed to improve the device performance of MoS 2 photodetectors, − especially plasmon based on metallic nanoparticles. ,, The embedment of nanoparticles can strengthen the near-surface electromagnetic field, accordingly boosting the photoresponse.…”