The construction of p-n junctions is necessitated by applications which require effective charge separation. Here, a novel heterostructure (HS) of molybdenum sulfide (MoS) and copper sulfide (CuS) was synthesized by chemical vapor deposition, with CuS nanoparticles vertically stacked on a MoS nanosheet. A well-defined epitaxial relationship between MoS and CuS is established, although the corresponding lattice mismatch is as large as 20%. The band-edge alignment is experimentally determined, indicating that the MoS-CuS HS is a type II heterojunction. Photoluminescence quenching indicates effective charge separation in HS. The resultant HS shows enhanced nonlinear absorption in comparison with single-component MoS nanosheets and CuS nanoparticles.
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| http://dx.doi.org/10.1021/acsami.9b06662 | DOI Listing |
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