High-Responsivity, High-Detectivity, Ultrafast Topological Insulator Bi2Se3/Silicon Heterostructure Broadband Photodetectors

As an exotic state of quantum matter, topological insulators have promising applications in new-generation electronic and optoelectronic devices. The realization of these applications relies critically on the preparation and properties understanding of high-quality topological insulators, which howe...

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Vydáno v:ACS nano Ročník 10; číslo 5; s. 5113 - 5122
Hlavní autoři: Zhang, Hongbin, Zhang, Xiujuan, Liu, Chang, Lee, Shuit-Tong, Jie, Jiansheng
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States American Chemical Society 24.05.2016
Témata:
topological insulator
high responsivity
silicon
fast photoresponse
heterostructure photodetector
ISSN:1936-0851, 1936-086X, 1936-086X
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Shrnutí:As an exotic state of quantum matter, topological insulators have promising applications in new-generation electronic and optoelectronic devices. The realization of these applications relies critically on the preparation and properties understanding of high-quality topological insulators, which however are mainly fabricated by high-cost methods like molecular beam epitaxy. We here report the successful preparation of high-quality topological insulator Bi2Se3/Si heterostructure having an atomically abrupt interface by van der Waals epitaxy growth of Bi2Se3 films on Si wafer. A simple, low-cost physical vapor deposition (PVD) method was employed to achieve the growth of the Bi2Se3 films. The Bi2Se3/Si heterostructure exhibited excellent diode characteristics with a pronounced photoresponse under light illumination. The built-in potential at the Bi2Se3/Si interface greatly facilitated the separation and transport of photogenerated carriers, enabling the photodetector to have a high light responsivity of 24.28 A W–1, a high detectivity of 4.39 × 1012 Jones (Jones = cm Hz1/2 W–1), and a fast response speed of aproximately microseconds. These device parameters represent the highest values for topological insulator-based photodetectors. Additionally, the photodetector possessed broadband detection ranging from ultraviolet to optical telecommunication wavelengths. Given the simple device architecture and compatibility with silicon technology, the topological insulator Bi2Se3/Si heterostructure holds great promise for high-performance electronic and optoelectronic applications.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/acsnano.6b00272