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Photoelectric characteristics of the MoTe2–MoS2 heterostructure device. (a) I–V curves under λ = 532 nm. (b) I–V curves under λ = 1064 nm. (c) Photoresponsivity under λ = 532 nm and λ = 1064 nm. (d) On–off characteristics under λ = 532 nm and P = 700 μW.
