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Lattice-Mismatched PbTe/ZnTe Heterostructure with High-Speed Midinfrared Photoresponses

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journal contribution
posted on 08.10.2019, 13:42 authored by Songsong Ma, Kai Li, Hanlun Xu, Jiaqi Zhu, Haiming Zhu, Huizhen Wu
In this work, a novel heterostructure consisting of different lattice structures with zincblende ZnTe and rock-salt PbTe is proposed. The PbTe/ZnTe heterostructures are grown by molecular beam epitaxy. Type-I band alignment at the PbTe/ZnTe heterointerface is revealed by X-ray photoelectron spectroscopy. The interface of the heterostructure exhibits exotic electrical properties. The novel heterostructure is then implemented to develop high-performance mid-infrared photodetectors which demonstrate pronounced responsivity, swift response speed, and high detectivity. The new photodetectors utilize the lateral photovoltaic effect which facilitates the understanding of the novel PbTe/ZnTe heterostructures.