Determining the band alignment of TbAs:GaAs and TbAs:In{sub 0.53}Ga{sub 0.47}As

Journal Article · Mon Sep 07 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4930816· OSTI ID:22482035

Bomberger, Cory C.; Chase, D. Bruce; Zide, Joshua M. O., ^[1]; Vanderhoef, Laura R. ^[2]; Rahman, Abdur ^[3]; Shah, Deesha; Taylor, Antoinette J.; Azad, Abul K. ^[4]; Doty, Matthew F. ^[1]

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1. Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716 (United States)
2. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
3. Physics and Technology Department, Edinboro University of Pennsylvania, Edinboro, Pennsylvania 16444 (United States)
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We propose and systematically justify a band structure for TbAs nanoparticles in GaAs and In{sub 0.53}Ga{sub 0.47}As host matrices. Fluence-dependent optical-pump terahertz-probe measurements suggest the TbAs nanoparticles have a band gap and provide information on the carrier dynamics, which are determined by the band alignment. Spectrophotometry measurements provide the energy of optical transitions in the nanocomposite systems and reveal a large blue shift in the absorption energy when the host matrix is changed from In{sub 0.53}Ga{sub 0.47}As to GaAs. Finally, Hall data provides the approximate Fermi level in each system. From this data, we deduce that the TbAs:GaAs system forms a type I (straddling) heterojunction and the TbAs:In{sub 0.53}Ga{sub 0.47}As system forms a type II (staggered) heterojunction.

• OSTI ID: 22482035
• Journal Information: Applied Physics Letters, Vol. 107, Issue 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
APPROXIMATIONS
CARRIERS
FERMI LEVEL
GALLIUM ARSENIDES
HETEROJUNCTIONS
INFORMATION
NANOPARTICLES
SPECTROPHOTOMETRY