Bi2Se3Growth on (001) GaAs Substrates for Terahertz Integrated Systems

Yongchen Liu, Wilder Acuna, Huairuo Zhang, Dai Q. Ho, Ruiqi Hu, Zhengtianye Wang, Anderson Janotti, Garnett Bryant, Albert V. Davydov, Joshua M.O. Zide, Stephanie Law

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Terahertz (THz) technologies have been of interest for many years due to the variety of applications including gas sensing, nonionizing imaging of biological systems, security and defense, and so forth. To date, scientists have used different classes of materials to perform different THz functions. However, to assemble an on-chip THz integrated system, we must understand how to integrate these different materials. Here, we explore the growth of Bi2Se3, a topological insulator material that could serve as a plasmonic waveguide in THz integrated devices, on technologically important GaAs(001) substrates. We explore surface treatments and find that an atomically smooth GaAs surface is critical to achieving high-quality Bi2Se3 films despite the relatively weak film/substrate interaction. Calculations indicate that the Bi2Se3/GaAs interface is likely selenium-terminated and shows no evidence of chemical bonding between the Bi2Se3 and the substrate. These results are a guide for integrating van der Waals materials with conventional semiconductor substrates and serve as the first steps toward achieving an on-chip THz integrated system.

Original languageEnglish (US)
Pages (from-to)42683-42691
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number37
StatePublished - Sep 21 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science


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