Mid-wave to near-IR optoelectronic properties and epsilon-near-zero behavior in indium-doped cadmium oxide
Journal Article
·
· Physical Review Materials
- Pennsylvania State Univ., University Park, PA (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Vanderbilt Univ., Nashville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Army Research Office, Research Triangle Park, NC (United States). DEVCOM US Army Research Lab.
Indium-doped cadmium oxide (In:CdO) thin films exhibit tunable epsilon-near-zero (ENZ) modal frequencies across a wide spectral range, bridging the mid-wave and near-infrared (IR). In:CdO thin films are prepared by reactive cosputtering from metallic Cd and In targets using high-power impulse magnetron sputtering (HiPIMS) and radio frequency sputtering, respectively. Using this approach, CdO thin films with carrier concentrations ranging from 2.3 × 1019 to 4.0 × 1020 cm–3 and mobilities ranging from 300 to 400 cm2/Vs are readily achieved. UV-VIS absorption spectra are used to measure optical bandgap, revealing a Burstein-Moss shift of 0.58 eV across the doping range investigated. In this work, optical measurements demonstrate the tunability of near-perfect plasmonic ENZ absorption across the mid-wave and into the near-IR spectral ranges by controlling the carrier concentration through doping, while tuning the film thickness for impedance matching. In comparison to other dopants that can be introduced to HiPIMS-deposited CdO, In offers the largest range of carrier concentrations while maintaining high mobility, thus allowing for the widest accessibility of the IR spectrum of a single plasmonic material grown by sputtering.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Sponsoring Organization:
- National Science Foundation (NSF); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); USDOD; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1783018
- Journal Information:
- Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 3 Vol. 5; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Broadband, High-Speed, and Large-Amplitude Dynamic Optical Switching with Yttrium-Doped Cadmium Oxide
Doping-tunable thermal emission from plasmon polaritons in semiconductor epsilon-near-zero thin films
Journal Article
·
Thu Dec 12 19:00:00 EST 2019
· Advanced Functional Materials
·
OSTI ID:1595422
Doping-tunable thermal emission from plasmon polaritons in semiconductor epsilon-near-zero thin films
Journal Article
·
Mon Sep 29 00:00:00 EDT 2014
· Applied Physics Letters
·
OSTI ID:1426896