https://doi.org/10.1140/epjp/s13360-023-04193-w
Regular Article
Photocurrent enhancement of topological insulator by femtosecond laser controlled surface structure
1
Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 100081, Beijing, People’s Republic of China
2
Yangtze Delta Region Academy of Beijing Institute of Technology, 314019, Jiaxing, People’s Republic of China
Received:
9
February
2023
Accepted:
15
June
2023
Published online:
25
June
2023
Bismuth selenide (Bi2Se3) is a well-known topological insulator material with numerous applications in optoelectronics, spintronics, quantum computing, and other fields. In this study, large and uniform periodic surface structures were achieved in Bi2Se3 by a single scan with a linearly polarized femtosecond laser. The periodic surface structures can be precisely adjusted by changing the laser fluence and scanning speed. The simulation results of the absorption spectrum show that the obtained structure can effectively improve the optical absorption efficiency in the near-infrared band, which is conducive to further improving the photoelectric applications of the material. Furthermore, voltammetric tests demonstrate that the surface structure has significant advantages in increasing the current value of the topological optoelectronic device.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
