Tunable Spectral Properties of Photodetectors Based on Quaternary Transition Metal Dichalcogenide Alloys Mo_xW_(1-x)Se_2yS_2(1-y)

Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

“…Susarla et al. demonstrated material optical properties with alloying, Mo x W (1-x) S 2y Se 2(1-y) , with CVD synthesis ( Avdizhiyan et al., 2021 ; Susarla et al., 2017 ). CVD Synthesis of the quaternary alloy at 750°C provided a better distribution of composition throughout the sample with a bandgap range of 1.61–1.85 eV.…”

Machine learning-enabled band gap prediction of monolayer transition metal chalcogenide alloys

“…So far, by alloying different chalcogen atoms or transition metals, ternary monolayer TMD alloys, such as Mo 1− x W x S 2 , 10–20 Mo 1− x W x Se 2 , 21–23 MoS 2(1− x ) Se 2 x , 14,24–36 WS 2(1− x ) Se 2 x , 37,38 MoS 2(1− x ) Te 2 x , 39 MoSe 2(1− x ) Te 2 x , 39,40 WS 2(1− x ) Te 2 x , 39 and WSe 2(1− x ) Te 2 x , 39,41 have been successfully synthesized using physical vapor deposition, chemical vapor deposition, mechanical exfoliation methods, etc. Moreover, quaternary alloy Mo x W (1− x ) S 2 y Se 2(1− y ) 42–44 has also been synthesized by alloying different chalcogen atoms and transition metals through chemical vapor deposition. The composition-dependent band gaps of ternary monolayer TMD alloys have been studied through theoretical calculations 32,37,45–48 and experimental work, 10,15,17,18,21,22,25,26,29,32,33,37,38,43,49 indicating that monolayer TMD alloys can exhibit continuously tunable gaps spanning across those of their constituents and there is a significant band gap bowing effect in the 2D TMD alloys.…”

“…So far, by alloying different chalcogen atoms or transition metals, ternary monolayer TMD alloys, such as Mo 1Àx W x S 2 , [10][11][12][13][14][15][16][17][18][19][20] Mo 1Àx W x Se 2 , [21][22][23] MoS 2(1Àx) Se 2x , 14,[24][25][26][27][28][29][30][31][32][33][34][35][36] WS 2(1Àx) Se 2x , 37,38 MoS 2(1Àx) -Te 2x , 39 MoSe 2(1Àx) Te 2x , 39,40 WS 2(1Àx) Te 2x , 39 and WSe 2(1Àx) Te 2x , 39,41 have been successfully synthesized using physical vapor deposition, chemical vapor deposition, mechanical exfoliation methods, etc. Moreover, quaternary alloy Mo x W (1Àx) S 2y Se 2(1Ày) [42][43][44] has also been synthesized by alloying different chalcogen atoms and transition metals through chemical vapor deposition. The compositiondependent band gaps of ternary monolayer TMD alloys have been studied through theoretical calculations 32,37,[45][46][47][48]<...>…”

Optoelectronic Properties of Atomically Thin MoxW(1−x)S2 Nanoflakes Probed by Spatially-Resolved Monochromated EELS

“…when it comes to 2D TMDs, even though bulk TMD alloys have existed for decades now, a wide array of 2D TMD alloys have been synthesised in the past decade [54], thanks to the development in synthesis techniques such as chemical vapor deposition [32], physical vapor deposition [55], chalcogen exchange [32] and colloidal solution synthesis [51,52]. Even so, only a small number of alloys has been achieved so far; most of them ternary alloys based on Mo, W, S, Se and Te [16,24,32,51,52,[55][56][57][58][59][60], although new alloys with different transition metals have also been achieved [33,58,61,62], as well as quaternary alloys [17,[63][64][65][66]. Novel optoelectronic applications have arisen from these new materials [66][67][68][69].…”

“…Even so, only a small number of alloys has been achieved so far; most of them ternary alloys based on Mo, W, S, Se and Te [16,24,32,51,52,[55][56][57][58][59][60], although new alloys with different transition metals have also been achieved [33,58,61,62], as well as quaternary alloys [17,[63][64][65][66]. Novel optoelectronic applications have arisen from these new materials [66][67][68][69].…”