Photoelectrochemical properties of chemically exfoliated MoS2

MoS2/WS2 Heterojunction for Photoelectrochemical Water Oxidation

“…NaClO 4 was utilized as the electrolyte as chlorine is in its highest oxidation state (VII) and it cannot be further oxidized, ruling out any contribution to the photocurrent due to the oxidation of the electrolyte. 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 15 Indeed, it has been observed and predicted that interlayer excitons in bilayer heterostructures present much longer lifetimes, on the orders of nanoseconds. 10 Specifically, in a MoSe 2 /WSe 2 bilayer heterostructure, 58 electrons localized on the MoSe 2 and holes on the WSe 2 monolayer can have life times over ~ 1.8 ns at 20 K in non-bias conditions, which is 10 times longer than lifetimes in defect-free monolayer material.…”

“…This indicates a potential use as photoanodes for water oxidation. 21,22 Furthermore, previous reports, have shown the ability of single crystal WS 2 24 and MoS 2 in bulk and monolayered form [25][26][27][28] to oxidize electrolytes normally with a significantly smaller oxidation potential than water. In addition, the conduction band edge of WS 2 is above the reduction potential of protons [E 0 = 0 V vs standard hydrogen electrode (SHE)], which presents the possibility to use the same material for a complete cycle of water splitting.…”

Ultrahigh Photoresponse of Few‐Layer TiS3 Nanoribbon Transistors

“…Among the large family of semiconducting chalcogenides, Mo-and W-based dichalcogenides are the most studied materials because of their electronic and optical properties which could make them complementary materials to graphene in applications requiring optically active semiconducting materials. [4][5][6][7][8][9][10][11][12][13][14] Nonetheless, there are many other semiconducting chalcogenide materials where electronic properties, in atomically thin form, are thus far unexplored.…”

Influence of the substrate material on the optical properties of tungsten diselenide monolayers

“…Today, the 'scotch tape method' is the most used method [12][13][14][15][16] to prepare monolayers (MLs) of WSe 2 from its bulk counterpart. However, WSe 2 layers have been also fabricated using chemical exfoliation [17][18][19], chemical vapor deposition (CVD) [20][21][22][23][24], metal-organic chemical vapor deposition (MOCVD) [25], hydrothermal exfoliation [26], liquid exfoliation [27][28][29], and physical vapor deposition [30,31]. Due to the existence of these various fabrication techniques, the focus has now shifted to the production of highquality MLs [16,32,33].…”