Dr. Tim Wernicke Profile

Dr. Tim Wernicke

at Technische Univ Berlin

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 13 March 2024 Paper

Paper

Defects, performance, and reliability in UVC LEDs

Matteo Meneghini, Nicola Roccato, Francesco Piva, Marco Pilati, Carlo De Santi, Matteo Buffolo, Norman Susilo, David Hauer Vidal, Anton Muhin, Luca Sulmoni, Jan Ruschel, Johannes Glaab, Jens Rass, Sven Einfeldt, Tim Wernicke, Michael Kneissl, Gaudenzio Meneghesso, Enrico Zanoni

Proceedings Volume 12906, 129060C (2024) https://doi.org/10.1117/12.3001050

KEYWORDS: Light emitting diodes, Reliability, Magnesium, Simulations, Quantum devices, Ultraviolet light emitting diodes, TCAD, Electrons, Doping, Optics manufacturing

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Proceedings Article | 13 March 2024 Presentation

Presentation

Prospects of far-UVC LED technology

Michael Kneissl, Giulia Cardinali, Martin Guttmann, Anton Muhin, Marcel Schilling, Luca Sulmoni, Tim Wernicke, Hyun-Kyong Cho, Johannes Glaab, Tim Kolbe, Jan Ruschel, Sylvia Hagedorn, Neysha Lobo-Ploch, Carsten Netzel, Jens Rass, Sven Einfeldt, Markus Weyers

Proceedings Volume PC12906, PC1290609 (2024) https://doi.org/10.1117/12.3014216

KEYWORDS: Light emitting diodes, External quantum efficiency, Quantum light, Quantum efficiency, Ultraviolet radiation, Skin, Quantum technology applications, Quantum emitters, Pathogens, Dielectric polarization

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Proceedings Article | 9 March 2024 Presentation

Presentation

Spatially resolved effects in UV LEDs with relevance for device performance and reliability

Jan Ruschel, Tim Kolbe, Jens Tomm, Johannes Glaab, Marcel Schilling, Sylvia Hagedorn, Jens Rass, Hyun Cho, Christoph Stölmacker, Martin Guttmann, Tim Wernicke, Markus Weyers, Michael Kneissl, Sven Einfeldt

Proceedings Volume PC12886, PC1288615 (2024) https://doi.org/10.1117/12.3002498

KEYWORDS: Ultraviolet light emitting diodes, Reliability, Light emitting diodes, Ultraviolet radiation, UV optics, Phototherapy, Lamps, Emission wavelengths, Design and modelling, Cameras

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Proceedings Article | 21 March 2023 Presentation

Presentation

Electrochemical etching for thin-film light-emitters

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Estrella Torres, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2651475

KEYWORDS: Thin films, Electrochemical etching

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Proceedings Article | 21 March 2023 Presentation

Presentation

Advances in far-UVC LEDs and irradiation systems for medicine and sensing

Sven Einfeldt, Jan Ruschel, Hyun Kyong Cho, Jens Rass, Martin Guttmann, Thomas Filler, Marcel Schilling, Tim Kolbe, Arne Knauer, Sylvia Hagedorn, Luca Sulmoni, Heiko Gundlach, Christoph Stoelmacker, Steffen Knigge, Johannes Glaab, Tim Wernicke, Lucas Wittenbecher, Neysha Lobo Ploch, Markus Weyers, Olaf Krueger, Ulrike Woggon, Axel Kramer, Martina Meinke, Michael Kneissl

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2648706

KEYWORDS: Light emitting diodes, Sensing systems, Medicine, Ultraviolet light emitting diodes, Skin, Semiconductors, Pollution detection, Pathogens, Packaging, Oxides

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Proceedings Article | 21 March 2023 Presentation

Presentation

Exploring the efficiency limits of AlGaN multi-quantum well deep UV-LEDs

Michael Kneissl, Giulia Cardinali, Martin Guttmann, Anton Muhin, Marcel Schilling, Luca Sulmoni, Tim Wernicke, Hyun Kyong Cho, Johannes Glaab, Arne Knauer, Tim Kolbe, Jan Ruschel, Sylvia Hagedorn, Neysha Lobo-Ploch, Carsten Netzel, Jens Rass, Sven Einfeldt, Markus Weyers

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2651983

KEYWORDS: Light emitting diodes, External quantum efficiency, Skin, Sapphire, Deep ultraviolet, Aluminum nitride, Viruses, Ultraviolet light emitting diodes, Toxic gases, Polarization

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Degradation of AlGaN-based SQW UV-C LEDs investigated by capacitance deep level transient spectroscopy

F. Piva, M. Buffolo, C. De Santi, M. Pilati, N. Roccato, A. Muhin, N. Susilo, D. Hauer Vidal, L. Sulmoni, T. Wernicke, M. Kneissl, G. Meneghesso, E. Zanoni, M. Meneghini

Proceedings Volume 12421, 1242107 (2023) https://doi.org/10.1117/12.2649078

KEYWORDS: Light emitting diodes, Magnesium, Capacitance, Aluminum, Quantum wells

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Proceedings Article | 14 March 2023 Paper

Paper

III-N optoelectronic devices: understanding the physics of electro-optical degradation

Matteo Meneghini, Nicola Roccato, Francesco Piva, Carlo De Santi, Matteo Buffolo, Camille Haller, Jean-François Carlin, Nicolas Grandjean, Alberto Tibaldi, Francesco Bertazzi, Michele Goano, Giovanni Verzellesi, Tim Wernicke, Michael Kneissl, Gaudenzio Meneghesso, Enrico Zanoni

Proceedings Volume 12441, 124410D (2023) https://doi.org/10.1117/12.2649909

KEYWORDS: Light emitting diodes, Quantum wells, Physics, Indium gallium nitride, Electro optics, Quantum processes, Optoelectronic devices, Visible radiation, Quantum devices

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Proceedings Article | 9 March 2022 Presentation

Presentation

Development of far-UVC LEDs and their application in irradiation systems for antisepsis and sensing

Neysha Lobo Ploch, Hyun Kyong Cho, Thomas Filler, Johannes Glaab, Heiko Gundlach, Martin Guttmann, Sylvia Hagedorn, Frank Mehnke, Jens Rass, Jan Ruschel, Marcel Schilling, Luca Sulmoni, Tim Wernicke, Lucas Wittenbecher, Ulrike Woggon, Axel Kramer, Martina Meinke, Michael Kneissl, Markus Weyers, Ulrike Winterwerber, Sven Einfeldt

Proceedings Volume PC12022, PC120220D (2022) https://doi.org/10.1117/12.2607275

KEYWORDS: Light emitting diodes, Skin, Sensing systems, Pathogens, Metals, Packaging, Optical filters, Gases

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Proceedings Article | 9 March 2022 Presentation

Presentation

Thin-film UV VCSELs and LEDs by electrochemical etching

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Johan Gustavsson, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12022, PC120220B (2022) https://doi.org/10.1117/12.2612369

KEYWORDS: Vertical cavity surface emitting lasers, Ultraviolet radiation, Electrochemical etching, Thin films, Mirrors, Thermal optics, Light emitting diodes, Etching, Dielectric mirrors

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Proceedings Article | 5 March 2022 Presentation

Presentation

Thin-film flip-chip UVB LEDs realized by electrochemical etching

Michael Bergmann, Johannes Enslin, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume PC12001, PC120010T (2022) https://doi.org/10.1117/12.2609581

KEYWORDS: Thin films, Light emitting diodes, Electrochemical etching

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Proceedings Article | 5 March 2022 Presentation

Presentation

Out of the blue: UV VCSELs

Åsa Haglund, Filip Hjort, Johannes Enslin, Michael Bergmann, Munise Cobet, Giulia Cardinali, Nando Prokop, Lars Persson, Tim Kolbe, Johan Gustavsson, Joachim Ciers, Tim Wernicke, Michael Kneissl

Proceedings Volume PC12001, PC120010F (2022) https://doi.org/10.1117/12.2612378

KEYWORDS: Vertical cavity surface emitting lasers, Ultraviolet radiation, Mirrors, Electrochemical etching, Dielectric mirrors

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Proceedings Article | 5 March 2022 Presentation + Paper

Presentation + Paper

UV LED reliability: degradation mechanisms and challenges

Matteo Meneghini, Francesco Piva, Carlo De Santi, Nicola Trivellin, Matteo Buffolo, Nicola Roccato, Riccardo Brescancin, Massimo Grigoletto, Davide Fiorimonte, Sven Einfeldt, Johannes Glaab, Jan Ruschel, Norman Susilo, Tim Wernicke, Michael Kneissl, Gaudenzio Meneghesso, Enrico Zanoni

Proceedings Volume 12001, 120010B (2022) https://doi.org/10.1117/12.2606858

KEYWORDS: Light emitting diodes, Ultraviolet light emitting diodes, Magnesium, Reliability, Ionization, Quantum wells, Gallium, Electron beam lithography, Ultraviolet radiation, Semiconductors

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Proceedings Article | 5 March 2021 Presentation

Presentation

Advances in ultraviolet-emitting vertical-cavity surface-emitting lasers

Filip Hjort, Johannes Enslin, Munise Cobet, Michael Bergmann, Joachim Ciers, Giulia Cardinali, Nando Prokop, Tim Kolbe, Felix Nippert, Markus Wagner, Johan Gustavsson, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume 11686, 116860F (2021) https://doi.org/10.1117/12.2576044

KEYWORDS: Vertical cavity surface emitting lasers, Optical pumping, Laser therapeutics, Electrochemical etching, Distributed Bragg reflectors, Dielectrics

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Proceedings Article | 5 March 2021 Presentation

Presentation

Thin-film flip-chip UVB LEDs enabled by electrochemical etching

Michael Bergmann, Johannes Enslin, Martin Guttmann, Luca Sulmoni, Neysha Lobo-Ploch, Filip Hjort, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund

Proceedings Volume 11686, 1168612 (2021) https://doi.org/10.1117/12.2582972

KEYWORDS: Light emitting diodes, Electrochemical etching, Thin films, Ultraviolet radiation, Vapor phase epitaxy, Ultraviolet light emitting diodes, Therapeutics, Silicon, Silica, Multilayers

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Proceedings Article | 5 March 2021 Presentation

Presentation

AlGaN-based deep UV LEDs: applications and challenges

Michael Kneissl, Giulia Cardinali, Johannes Enslin, Christian Kuhn, Martin Guttmann, Frank Mehnke, Luca Sulmoni, Norman Susilo, Tim Wernicke, Hyun Kyong Cho, Johannes Glaab, Jan Ruschel, Sylvia Hagedorn, Neyhsa Lobo-Ploch, Carsten Netzel, Jens Rass, Sven Einfeldt, Markus Weyers

Proceedings Volume 11686, 116860Y (2021) https://doi.org/10.1117/12.2584960

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Proceedings Article | 26 February 2019 Paper

Paper

Inhomogeneous spectral broadening in deep ultraviolet light emitting diodes

Friedhard Römer, Bernd Witzigmann, Martin Guttmann, Norman Susilo, Tim Wernicke, Michael Kneissl

Proceedings Volume 10912, 109120D (2019) https://doi.org/10.1117/12.2512182

KEYWORDS: Quantum wells, Light emitting diodes, Deep ultraviolet, Aluminum, Luminescence, Ultraviolet light emitting diodes, Spectral models, Electronics, Absorption, Polarization

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Proceedings Article | 19 February 2018 Paper

Paper

10th order laterally coupled GaN-based DFB laser diodes with V-shaped surface gratings

J. H. Kang, H. Wenzel, V. Hoffmann, E. Freier, L. Sulmoni, R.-S. Unger, S. Einfeldt, T. Wernicke, M. Kneissl

Proceedings Volume 10553, 105530A (2018) https://doi.org/10.1117/12.2289929

KEYWORDS: Distributed feedback laser diodes, Etching, Lithography, Plasma etching, Gallium, Reflectivity, Semiconductor lasers

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Proceedings Article | 15 February 2018 Paper

Paper

Defect-generation and diffusion in (In)AlGaN-based UV-B LEDs submitted to constant current stress

D. Monti, M. Meneghini, C. De Santi, S. Da Ruos, G. Meneghesso, E. Zanoni, J. Glaab, J. Rass, S. Einfeldt, F. Mehnke, J. Enslin, T. Wernicke, M. Kneissl

Proceedings Volume 10554, 1055410 (2018) https://doi.org/10.1117/12.2292202

KEYWORDS: Quantum wells, Light emitting diodes, Diffusion, Electroluminescence, Gallium nitride

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Proceedings Article | 19 April 2017 Presentation

Presentation

Improved light extraction and quantum efficiencies for UVB LEDs with UV-transparent p-AlGaN superlattices (Conference Presentation)

Martin Guttmann, Martin Hermann, Johannes Enslin, Sarina Graupeter, Luca Sulmoni, Christian Kuhn, Tim Wernicke, Michael Kneissl

Proceedings Volume 10104, 101041S (2017) https://doi.org/10.1117/12.2250573

KEYWORDS: Light emitting diodes, Reflectivity, Superlattices, Aluminum, External quantum efficiency, Metals, Quantum efficiency, Light sources and illumination, Phototherapy, Ultraviolet radiation

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Proceedings Article | 16 February 2017 Paper

Paper

Defect generation in deep-UV AlGaN-based LEDs investigated by electrical and spectroscopic characterisation

Desiree Monti, Matteo Meneghini, Carlo De Santi, Gaudenzio Meneghesso, Enrico Zanoni, Johannes Glaab, Jens Rass, Sven Einfeldt, Frank Mehnke, Tim Wernicke, Michael Kneissl

Proceedings Volume 10124, 101240T (2017) https://doi.org/10.1117/12.2253843

KEYWORDS: Light emitting diodes, Deep ultraviolet, Optical spectroscopy, Ultraviolet sources, Nitrogen, Internal quantum efficiency, Electro optics, Spectroscopes, UV optics, Magnesium, Quantum wells, Spectroscopy, Statistical analysis, Quantum efficiency, Electroluminescence

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Proceedings Article | 26 February 2016 Paper

Paper

Influence of the LED heterostructure on the degradation behavior of (InAlGa)N-based UV-B LEDs

Johannes Glaab, Neysha Lobo Ploch, Jens Rass, Tim Kolbe, Tim Wernicke, Frank Mehnke, Christian Kuhn, Johannes Enslin, Christoph Stölmacker, Viola Kueller, Arne Knauer, Sven Einfeldt, Markus Weyers, Michael Kneissl

Proceedings Volume 9748, 97481O (2016) https://doi.org/10.1117/12.2208906

KEYWORDS: Light emitting diodes, Ultraviolet light emitting diodes, Heterojunctions, Ultraviolet radiation, Vapor phase epitaxy, Quantum wells, Luminescence, Aluminum nitride, Magnesium, Diffusion, Electro optics, Chemical species

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Proceedings Article | 13 March 2015 Paper

Paper

Current spreading in UV-C LEDs emitting at 235 nm

Mickael Lapeyrade, Florian Eberspach, Johannes Glaab, Neysha Lobo-Ploch, Christoph Reich, Christian Kuhn, Martin Guttmann, Tim Wernicke, Frank Mehnke, Sven Einfeldt, Arne Knauer, Markus Weyers, Michael Kneissl

Proceedings Volume 9363, 93631P (2015) https://doi.org/10.1117/12.2076349

KEYWORDS: Light emitting diodes, Resistance, Epitaxial lateral overgrowth, Aluminum, Sapphire, Electroluminescence, Temperature metrology, Semiconducting wafers, Ultraviolet radiation, Metals

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Proceedings Article | 13 March 2015 Paper

Paper

High-power UV-B LEDs with long lifetime

Jens Rass, Tim Kolbe, Neysha Lobo-Ploch, Tim Wernicke, Frank Mehnke, Christian Kuhn, Johannes Enslin, Martin Guttmann, Christoph Reich, Anna Mogilatenko, Johannes Glaab, Christoph Stoelmacker, Mickael Lapeyrade, Sven Einfeldt, Markus Weyers, Michael Kneissl

Proceedings Volume 9363, 93631K (2015) https://doi.org/10.1117/12.2077426

KEYWORDS: Light emitting diodes, Electron beam lithography, Aluminum nitride, Aluminum, Polarization, Luminescence, Sapphire, External quantum efficiency, Quantum wells, Ultraviolet radiation

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Proceedings Article | 28 February 2012 Paper

Paper

Auger effect in nonpolar quantum wells

Lukas Schade, Ulrich Schwarz, Tim Wernicke, Jens Rass, Simon Ploch, Markus Weyers, Michael Kneissl

Proceedings Volume 8262, 82620K (2012) https://doi.org/10.1117/12.905955

KEYWORDS: Quantum wells, Polarization, Indium gallium nitride, Gallium nitride, Quantum efficiency, Light emitting diodes, Internal quantum efficiency, Promethium, Crystals, Indium

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Proceedings Article | 28 February 2012 Paper

Paper

Polarization of eigenmodes and the effect on the anisotropic gain in laser structures on nonpolar and semipolar GaN

Jens Rass, Tim Wernicke, Simon Ploch, Moritz Brendel, Andreas Kruse, Andreas Hangleiter, Wolfgang Scheibenzuber, Ulrich Schwarz, Markus Weyers, Michael Kneissl

Proceedings Volume 8262, 826218 (2012) https://doi.org/10.1117/12.907865

KEYWORDS: Polarization, Crystals, Resonators, Laser resonators, Laser damage threshold, Quantum wells, Gallium nitride, Waveguides, Indium, Semiconductor lasers

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Proceedings Article | 13 February 2008 Paper

Paper

GaN substrates by HVPE

Markus Weyers, Eberhard Richter, Ch. Hennig, S. Hagedorn, T. Wernicke, G. Tränkle

Proceedings Volume 6910, 69100I (2008) https://doi.org/10.1117/12.764405

KEYWORDS: Gallium nitride, Semiconducting wafers, Photomasks, Sapphire, Crystals, Gallium, Semiconductor lasers, Light emitting diodes, Epitaxial lateral overgrowth, Silicon

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Showing 5 of 27 publications

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