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2020 – Temperature Coefficient of SiC UV Photodiodes

23. Mai 2025 von sglux

Stefan Langer, sglux GmbH, Berlin, Germany

SiC Temperature Coefficient

Zusammenfassung
This report assigns the temperature coefficient (TC) of sglux SiC-photodiodes in relation to the incident wavelength. It demonstrates that the temperature coefficient is slightly negative for incident wavelengths below 270nm. At appox. 270nm is it almost zero and then strongly rises towards positive values with increasing wavelengths. The report further explains the physical background of this phenomena.

Kategorie: Forschung, Veröffentlichungen und Berichte

2005 – Electrical transport in passivated Pt/TiO2/Ti Schottky diodes

23. Mai 2025 von sglux

Th. Dittrich¹, V. Zinchuk², V. Skryshevsky², I. Urban³, O. Hilt⁴
¹Hahn-Meitner-Institut, Berlin, Germany
²Department of Radiophysics, Taras Shevchenko University, Kyiv, Ukraine
³Bundesanstalt für Materialforschung, Berlin, Germany
⁴sglux GmbH, Berlin, Germany

JOURNAL OF APPLIED PHYSICS 98, 104501 (2005)

Abstract
Pt/TiO2/Ti Schottky diodes were investigated by current-voltage analysis, photoresponse, and transient photocurrent(PC) in a wide temperature range. The compact TiO2 as well as the SiO2 passivation layers were prepared by the sol-gel technique. The Schottky-barrier height (1.2–1.3eV) was equal to the difference of the work functions of Pt and Ti. The temperature dependence of the ideality factor was interpreted in terms of a Gaussian distribution of barrier heights [J. H. Werner and H. H. Güttler, J. Appl. Phys.69, 1522 (1991)]. Space-charge-limited currents under the presence of defects with an exponential distribution were observed. Under zero-potential condition, the PC transients were practically independent of temperature and the electron drift mobility amounted to 2× 10E-4 cm² (Vs)
A screening dipole layer at the Pt/TiO2 junction was formed under low forward and reverse potentials. Defects were generated under electron injection.

Kategorie: Forschung, Veröffentlichungen und Berichte

2020 – Where SiC can replace discontinued GaP?

23. Mai 2025 von sglux

Dr. Tilman Weiss, sglux GmbH, Berlin, Germany

Technical Report „Where SiC can replace discontinued GaP?“

Zusammenfassung
For measurement applications with a peak radiation between 210 nm and 346 nm (e.g. UV sterilization lamp or combustion flame control) a SiC UV photodiode can replace a GaP photodiode without restrictions – it will even output a higher photocurrent. A SiC device irradiated with a peak radiation from 346 to 380 nm will output a lower photocurrent compared with GaP (at same active area). However, if the radiation intensity is high, e.g. curing applications at 365 nm the SiC’s current output will remain at a usable level.

Kategorie: Forschung, Veröffentlichungen und Berichte

2019 – Hochtemperatur SiC-Photodioden bis 350°C erhältlich

23. Mai 2025 von sglux

Dr. Niklas Papathanasiou, sglux GmbH, Berlin, Germany

Tech Report 350°C

Zusammenfassung
Neue Hochtemperatur SiC-Photodioden erhältlich. Die Photodioden können permanent bis zu einer Temperatur von 350°C betrieben werden.
[_/su_spoiler]

Kategorie: Forschung, Veröffentlichungen und Berichte

2018 – Quantification of harmful UV LED radiation at workplaces

23. Mai 2025 von sglux

G. Hopfenmüller, N. Papathanasiou, T. Weiss,
sglux GmbH, Berlin, Germany

Presentation on International Conference on UV LED Technologies & Applications 2018, Berlin, Germany

Abstract
Artificial UV radiation is applied in many processes such as UV disinfection, UV curing or biological activation. Besides discharge tubes, LEDs are becoming more important for a rising number of applications in particular UV curing or medical treatment. In general, exposure to UV radiation may cause health problems such as skin aging, eye damage or skin cancer. The potential danger varies with the irradiated wavelengths and the exposure time. The limits and the spectral weighting function of the UV irradiance are given in the directive 2006/25/EC published by the European Comission. The hereby submitted lecture will introduce a radiometer that precisely evaluates the hazard potential while displaying the maximum daily exposition time at a certain measurement point. The digital SiC based UV sensor has a spectral responsivity close to the biological weighting function and is calibrated to different UV LEDs with typical half widths. The sensor can be connected to any Android smartphone.

Kategorie: Forschung, Veröffentlichungen und Berichte

2014 – Spectral irradiance measurement and actinic radiometer calibration for UV water disinfection

23. Mai 2025 von sglux

P. Sperfeld¹, B. Barton¹, S. Pape¹, A. Towara¹, J. Eggers², G. Hopfenmueller³,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), Germany, ²DVGW-Technologiezentrum Wasser, Karlsruhe, Germany, ³sglux GmbH, Berlin, Germany

Metrologia, 51 (2014), S. 282-288.

Abstract
In a joint project, sglux and PTB investigated and developed methods and equipment to measure the spectral and weighted irradiance of high-efficiency UV-C emitters used in water disinfection plants. A calibration facility was set up to calibrate the microbicidal irradiance responsivity of actinic radiometers with respect to the weighted spectral irradiance of specially selected low-pressure mercury and medium-pressure mercury UV lamps. To verify the calibration method and to perform on-site tests, spectral measurements were carried out directly at water disinfection plants in operation. The weighted microbicidal irradiance of the plants was calculated and compared to the measurements of various actinic radiometers.

Kategorie: Forschung, Veröffentlichungen und Berichte

2009 – Electronic and photoelectrical properties of semiconducting titanium dioxide layers

23. Mai 2025 von sglux

C. Nitschke
Beuth Hochschule für Technik, Master Thesis, 2009

Master thesis 2009

Abstract
In the present thesis electronic and photoelectrical properties of semiconducting titanium dioxide layers were measured using different measuring methods. The titanium dioxide layers had been produced using the sol-gel-process with different precursor solutions. The findings and insights gained shall be used to manipulate the structure and functionality of UV-photodiodes with titanium-dioxide-layers. Traps had been proven both by the analysis of the spectral resolution of the photocurrent and thermally stimulated luminescence. These traps are affected by the titanium dioxide-layer manufacturing process. Using the impedance spectroscopy, the UV-photodiodes inner structure, the width of the space charge layer and the electrical conduction of the titanium dioxide-layer grains and grain boundaries could be measured. Between the impedance of the UV-photodiodes and the speed of reaction a correlation could be noticed. Additionally voltage dependent current and capacity measurements had been carried out as well as thermally stimulated currents had been measured.

Kategorie: Forschung, Veröffentlichungen und Berichte

2018 – Ein neues Werkzeug zur Gefährdungsbeurteilung von UV-Strahlung

23. Mai 2025 von sglux

Stefan Langer¹, Dr. Niklas Papathanasiou¹, Johanna Luise Krüger², Gabriel Hopfenmüller¹, Dr. Tilman Weiss¹
¹sglux GmbH, Berlin, Germany, ²Technische Universität Bergakademie Freiberg, Germany

50. Jahrestagung des Fachverbandes Strahlenschutz 2018, Dresden
Artikel anzeigen (noch nicht veröffentlicht)
Poster anzeigen

Zusammenfassung
Die industrielle Nutzung ultravioletter Strahlung erfordert neben der Beurteilung der Prozesswirksamkeit auch deren Bewertung hinsichtlich der Gefährdung des Bedien- und Wartungspersonals. Zu diesem Zweck sind Regelwerke entstanden, die die Durchführung der Strahlungsmessung und deren Bewertung hinsichtlich gesundheitlicher Gefahren beschreiben. Für diese Gefährdungsbeurteilung sind verschiedene Messgeräte am Markt erhältlich. Sie bestimmen die entsprechend der Norm gewichtete momentane Bestrahlungsstärke. Die Ermittlung der zulässigen maximalen täglichen Aufenthaltsdauer muss allerdings in nachfolgenden Rechenschritten erfolgen.
Ein neuartiger, mit diesem Konferenzbeitrag vorgestellter Ansatz basiert auf einem Sensor mit einer an die jeweilige Norm angepassten Empfindlichkeitscharakteristik, welcher mit einem Smartphone verbunden ist. Dort wird neben der Bestrahlungsstärke auch die zulässige Aufenthaltsdauer numerisch, graphisch und akustisch angezeigt. Weil für verschiedene Normen bzw. Strahlungsquellen spezifische Sensoren verwendet werden müssen, stellt das System sicher, dass der momentan angeschlossene Sensor zur Beurteilung der Strahlung nach der gewählten Norm geeignet ist. Dadurch werden der Aufwand und die Fehleranfälligkeit bei einer Gefahrenbewertung deutlich verringert und die Verwendung im Alltagsbetrieb gefördert.

Kategorie: Forschung, Veröffentlichungen und Berichte

2011 – Characterisation of SiC photodiodes for high irradiance UV radiometers

23. Mai 2025 von sglux

S. Nowy¹, B. Barton¹, S. Pape¹, P. Sperfeld¹, D. Friedrich¹, S. Winter¹, G. Hopfenmueller², and T. Weiss²,
¹Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ²sglux GmbH, Berlin, Germany

Proceedings of NEWRAD2011, edited by S. Park and E. Ikonen. (Aalto University, Espoo, Finland, 2011) p. 203.

Abstract
For monitoring high UV irradiance, silicon carbide (SiC) based photodiodes are used. In this paper we describe the characterization of the novel SiC UV photodiodes in terms of their spectral and integral responsivity. Special attention is paid to the aging behavior of the photodiodes due to high UV irradiance. Artificial aging of the samples is performed by illumination with a high power medium pressure mercury discharge lamp.

Kategorie: Forschung, Veröffentlichungen und Berichte Stichworte: irradiance_hi, photodiodes, science

2012 – Highly reliable Silicon Carbide photodiodes for visible-blind ultraviolet detector applications

23. Mai 2025 von sglux

D. Prasai¹, W. John¹, L. Weixelbaum¹, O. Krueger¹, G. Wagner², P. Sperfeld³, S. Nowy³, D. Friedrich³, S. Winter³ and T. Weiss⁴,
¹Ferdinand-Braun-Institut, Leibniz-Institut fuer Hoechstfrequenztechnik, Berlin, Germany, ²Leibniz-Institut fuer Kristallzuechtung, Berlin, Germany, ³Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (PTB), 4.1 Photometry and Applied Radiometry, Braunschweig, Germany, ⁴sglux GmbH, Berlin, Germany

J. Mater. Res., first view (2012).

Abstract
Highly efficient polytype 4H silicon carbide (4H-SiC) p–n diodes for ultraviolet (UV) light detection have been fabricated, characterized, and exposed to high-intensity mercury lamp irradiation (up to 17 mW/cm²). The behavior of the photocurrent response under UV light irradiation using a low-pressure mercury UV-C lamp (4 mW/cm²) and a medium-pressure mercury discharge lamp (17 mW/cm²) has been studied. We report on long-term UV photoaging tests performed for up to 22 mo. Results demonstrate the robustness of SiC photodiodes against UV radiation. The devices under test showed an initial burn-in effect, i.e., the photocurrent response dropped by less than 5% within the first 40 h of artificial UV aging. Such burn-in effect under UV stress was also observed for previously available polytype 6H silicon carbide (6H–SiC) p–n photodetectors. After burn-in, no measurable degradation has been detected, which makes the devices excellent candidates for high irradiance UV detector applications.

Kategorie: Forschung, Veröffentlichungen und Berichte Stichworte: calibration, irradiance_all, photodiodes, prod

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