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Title: Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond

Abstract

Spectrally and spatially resolved photovoltages were measured by Kelvin probe force microscopy (KPFM) on a Schottky photo-diode made of a 4 nm thin tungsten-carbide (WC) layer on a 500 nm oxygen-terminated boron-doped diamond epitaxial layer (O-BDD) that was grown on a Ib (100) diamond substrate. The diode was grounded by the sideways ohmic contact (Ti/WC), and the semitransparent Schottky contact was let unconnected. The electrical potentials across the device were measured in dark (only 650 nm LED of KPFM being on), under broad-band white light (halogen lamp), UV (365 nm diode), and deep ultraviolet (deuterium lamp) illumination. Illumination induced shift of the electrical potential remains within 210 mV. We propose that the photovoltage actually corresponds to a shift of Fermi level inside the BDD channel and thereby explains orders of magnitude changes in photocurrent.

Authors:
;  [1];  [2];  [3]
  1. Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 16200 Prague 6 (Czech Republic)
  2. Sensor Materials Center, National Institute for Material Science (NIMS), 1-1 Namiki, Tsukuba 305-0044 (Japan)
  3. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba 305-8568 (Japan)
Publication Date:
OSTI Identifier:
22278093
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL DOPING; CRYSTAL STRUCTURE; DEUTERIUM; DIAMONDS; EPITAXY; FERMI LEVEL; HALOGENS; ILLUMINANCE; LAYERS; MICROSCOPY; OXYGEN; PHOTODIODES; SCHOTTKY EFFECT; SUBSTRATES; TUNGSTEN CARBIDES; ULTRAVIOLET RADIATION; VISIBLE RADIATION

Citation Formats

Čermák, Jan, Rezek, Bohuslav, Koide, Yasuo, and Takeuchi, Daisuke. Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond. United States: N. p., 2014. Web. doi:10.1063/1.4864420.
Čermák, Jan, Rezek, Bohuslav, Koide, Yasuo, & Takeuchi, Daisuke. Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond. United States. https://doi.org/10.1063/1.4864420
Čermák, Jan, Rezek, Bohuslav, Koide, Yasuo, and Takeuchi, Daisuke. 2014. "Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond". United States. https://doi.org/10.1063/1.4864420.
@article{osti_22278093,
title = {Spectrally dependent photovoltages in Schottky photodiode based on (100) B-doped diamond},
author = {Čermák, Jan and Rezek, Bohuslav and Koide, Yasuo and Takeuchi, Daisuke},
abstractNote = {Spectrally and spatially resolved photovoltages were measured by Kelvin probe force microscopy (KPFM) on a Schottky photo-diode made of a 4 nm thin tungsten-carbide (WC) layer on a 500 nm oxygen-terminated boron-doped diamond epitaxial layer (O-BDD) that was grown on a Ib (100) diamond substrate. The diode was grounded by the sideways ohmic contact (Ti/WC), and the semitransparent Schottky contact was let unconnected. The electrical potentials across the device were measured in dark (only 650 nm LED of KPFM being on), under broad-band white light (halogen lamp), UV (365 nm diode), and deep ultraviolet (deuterium lamp) illumination. Illumination induced shift of the electrical potential remains within 210 mV. We propose that the photovoltage actually corresponds to a shift of Fermi level inside the BDD channel and thereby explains orders of magnitude changes in photocurrent.},
doi = {10.1063/1.4864420},
url = {https://www.osti.gov/biblio/22278093}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 115,
place = {United States},
year = {Fri Feb 07 00:00:00 EST 2014},
month = {Fri Feb 07 00:00:00 EST 2014}
}