Spectral Current Density and Responsivity Scaling for Fourier Transform Photocurrent Spectroscopy

We propose and experimentally verify two methods to scale arbitrary units to photocurrent spectral density (A/eV) in Fourier Transform Photocurrent (FTPC) spectroscopy. We also propose the FTPC scaling to responsivity (A/W), provided a narrow-band optical power measurement is available. The constant...

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Bibliographic Details
Published in:arXiv.org 2022-12
Main Authors: Kunc, Jan, Morzhuk, Bohdan, Shestopalov, Mykhailo, Fridrišek, Tomáš, Dědič, Václav
Format: Article
Language:English
Subjects:
Fourier transforms
Photoelectric effect
Photoelectric emission
Power measurement
Sensors
Spectroscopy
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Summary:We propose and experimentally verify two methods to scale arbitrary units to photocurrent spectral density (A/eV) in Fourier Transform Photocurrent (FTPC) spectroscopy. We also propose the FTPC scaling to responsivity (A/W), provided a narrow-band optical power measurement is available. The constant background of the interferogram provides a precise determination of the photocurrent spectral density. The second method relies on the scaled amplitude of the interferogram. Although the latter method leads to more significant errors, it still provides good order of magnitude estimates of the total photocurrent. We demonstrate the technique on a calibrated InGaAs diode and weak responsivity SiC interdigital sensors. We identify a series of impurity-band and interband transitions in the SiC sensors.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.08587