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Highly sensitive photodetector based on two-dimensional ferroelectric semiconducting \{beta}-InSe/graphene heterostructure
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Highly sensitive photodetector based on two-dimensional ferroelectric semiconducting \{beta}-InSe/graphene heterostructure
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2D ferroelectric \{beta}-InSe/graphene heterostructure was fabricated by mechanical exfoliation, and the carrier dynamics crossing the heterostructure interface has been systematically investigated by Raman, photoluminescence and transient absorption measurements. Due to the efficient interfacial photo excited electron transfer and photogating effect from trapped holes, the heterostructure devices demonstrate superior performance with maximum responsivity of 2.12*10e4 A/W, detectivity of 1.73*10e14 Jones and fast response time (241 us) under {\lambda} = 532 nm laser illumination. Furthermore, the photo responses influenced by ferroelectric polarization field are investigated. Our work confirms ferroelectric \{beta}-InSe/graphene heterostructure as an outstanding material platform for sensitive optoelectronic application.
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