Journal
OPTICAL MATERIALS
Volume 117, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.111118
Keywords
Topological insulator; Micropyramidal silicon; PVD; Heterojunction
Categories
Funding
- NSFC [61705229]
- Youth Innovation Promotion Association of CAS [2015316, 2018416]
- Project of Chongqing brain science Collaborative Innovation Center
- Project of CAS Western Young Scholar
- Project of CQ CSTC [cstc2017zdcy-zdyfX0001, cstc2017zdcy-zdyfX0078]
- Project of Chongqing Science and Technology Bureau [cstc2019jcyj-msxmX0574, cstc2019jscx-msxmX0081, cstc2019jscx-msxmX0024]
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By growing Bi2Se3 film on a silicon substrate and utilizing the light trapping effect of micropyramidal substrate and the high structural quality of the in-situ grown interface, a Bi2Se3/Si heterostructure with good photoresponse to broadband laser illumination is achieved. In addition, the etching process plays a critical role in improving the photoresponse.
Topological insulators have broad applications in the new generation of electronic devices and optoelectronic devices. Due to its narrow bandgap of 0.3 eV, Bi2Se3 film is a promising material for applications regarding visible light and infrared photodetection. However, the performance of photodetectors based on Bi2Se3 film is usually limited by the low absorption rate and the poor junction quality. In this work, we directly grew Bi2Se3 film onto the micropyramidal silicon by low-cost physical vapor deposition (PVD) method. Due to the light trapping of the micropyramidal substrate, and the high junction quality resulted from in-situ grown interface, the Bi2Se3/Si heterostructure has good photoresponse under broadband laser illumination of wavelengths from 635 to 2700 nm, which includes an excellent photo-to-dark ratio of 1.01 x 104, dark current of 0.11 nA, specific detectivity of 1.24 x 1011 Jones, and a fast response speed of microseconds. The etching process is found to be critical for the improvement of photoresponse. Our studies show a promising way to develop simple-technology, low-cost, high-efficiency heterojunction.
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