Enhanced Photocharacteristics by Fermi Level Modulating in Sb2Te3/Bi2Se3 Topological Insulator p–n Junction
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Published:2023-12-31
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Volume:
Page:
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ISSN:2198-3844
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Container-title:Advanced Science
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language:en
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Short-container-title:Advanced Science
Author:
Hong Seok‐Bo1ORCID,
Kim Dajung1,
Kim Jonghoon1,
Park Jaehan1,
Rho Seungwon1,
Huh Jaeseok1,
Lee Youngmin1,
Jeong Kwangsik2ORCID,
Cho Mann‐Ho13ORCID
Affiliation:
1. Department of Physics Yonsei University 50 Yonsei‐ro Seoul 03722 Republic of Korea
2. Division of Physics and Semiconductor Science Dongguk University Seoul 04620 Republic of Korea
3. Department of System Semiconductor Engineering Yonsei University 50 Yonsei‐ro Seoul 03722 Republic of Korea
Abstract
AbstractTopological insulators have recently received attention in optoelectronic devices because of their high mobility and broadband absorption resulting from their topological surface states. In particular, theoretical and experimental studies have emerged that can improve the spin generation efficiency in a topological insulator‐based p–n junction structure called a TPNJ, drawing attention in optospintronics. Recently, research on implementing the TPNJ structure is conducted; however, studies on the device characteristics of the TPNJ structure are still insufficient. In this study, the TPNJ structure is effectively implemented without intermixing by controlling the annealing temperature, and the photocharacteristics appearing in the TPNJ structure are investigated using a cross‐pattern that can compare the characteristics in a single device. Enhanced photo characteristics are observed for the TPNJ structure. An optical pump Terahertz probe and a physical property measurement system are used to confirm the cause of improved photoresponsivity. Consequently, the photocharacteristics are improved owing to the change in the absorption mechanism and surface transport channel caused by the Fermi level shift in the TPNJ structure.
Funder
National Research Foundation
Electronics and Telecommunications Research Institute
Ministry of Science and ICT, South Korea
Ministry of Trade, Industry and Energy
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)