Evidence of ion intercalation mediated band structure modification and opto-ionic coupling in lithium niobite
The theoretically suggested band structure of the novel p-type semiconductor lithium niobite (LiNbO{sub 2}), the direct coupling of photons to ion motion, and optically induced band structure modifications are investigated by temperature dependent photoluminescence. LiNbO{sub 2} has previously been used as a memristor material but is shown here to be useful as a sensor owing to the electrical, optical, and chemical ease of lithium removal and insertion. Despite the high concentration of vacancies present in lithium niobite due to the intentional removal of lithium atoms, strong photoluminescence spectra are observed even at room temperature that experimentally confirm the suggested band structure implying transitions from a flat conduction band to a degenerate valence band. Removal of small amounts of lithium significantly modifies the photoluminescence spectra including additional larger than stoichiometric-band gap features. Sufficient removal of lithium results in the elimination of the photoluminescence response supporting the predicted transition from a direct to indirect band gap semiconductor. In addition, non-thermal coupling between the incident laser and lithium ions is observed and results in modulation of the electrical impedance.
- OSTI ID:
- 22412978
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Quantum prediction of ultra-low thermal conductivity in lithium intercalation materials
CsSnI[subscript 3]: Semiconductor or Metal? High Electrical Conductivity and Strong Near-Infrared Photoluminescence from a Single Material. High Hole Mobility and Phase-Transitions
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CLATHRATES
CONCENTRATION RATIO
COUPLING
ELECTRONIC STRUCTURE
EMISSION SPECTRA
EMISSION SPECTROSCOPY
ENERGY GAP
IMPEDANCE
LITHIUM COMPOUNDS
LITHIUM IONS
MODIFICATIONS
PHOTOLUMINESCENCE
PHOTONS
P-TYPE CONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
VACANCIES
VALENCE