Room-temperature persistent photoconductivity of KTaO3
Data files
Abstract
This dataset contains IR spectra of potassium tantalate (KTO3). KTaO3 single crystals annealed in hydrogen exhibit room temperature persistent photoconductivity (PPC). The oxygen-poor annealing environment creates oxygen vacancies that are substituted with hydrogen. A photon of energy near the indirect band gap (3.65 eV) can excite this defect, resulting in free electrons in the conduction band. This causes an increase in n-type conductivity of 4 orders of magnitude with a recovery time of 2-4 years. Hydrogen leaves the O site and forms an O–H bond that is observed by IR spectroscopy. In addition to the O-H peak, the IR spectra contain information about free-carrier absorption.
Dataset DOI: 10.5061/dryad.g4f4qrg2w
Description of the data and file structure
IR spectroscopy data.
Fig2a.csv
Transmission (T) versus wavenumber (cm-1) after exposure to an LED with a given wavelength (nm). Each header is cm-1 or T for a particular LED exposure. X40 refers to spectra that were multiplied by a factor of 40.
Headers:
375 nm (cm-1)
375 nm (T)
340 nm (cm-1)
340 nm (T)
340 nm x40 (cm-1)
340 nm x40 (T)
300 nm x40 (cm-1)
300 nm x40 (T)
275 nm x40 (cm-1)
275 nm x40 (T)
Fig2b.csv
Absorbance versus wavenumber (cm-1). The ‘--' represent imaginary values due to taking the log of a negative number, and were excluded in the plot.
Headers:
cm-1
Absorbance
Fig3.csv
Absorbance versus wavenumber (cm-1), before and after polishing the sample.
Headers:
Before Polish (cm-1)
Before Polish (Absorbance)
After Polish (cm-1)
After Polish (Absorbance)