Fraunhofer Institute for Solar Energy Systems ISE
Fraunhofer Institute for Solar Energy Systems ISE

Dr. Henning Helmers

Deputy Head of Department »II-V Photovoltaics and Concentrator Technology«, Division Photovoltaics

Short biography

Dr. Henning Helmers has a profound experience in photovoltaics, with a focus on III-V based multi-junction solar cells, concentrating solar systems, high efficiency laser power converters, and optical power transmission. He joined the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg in 2008. Since 2013 he is coordinating the business area »Power-by-Light« Since 2019 he is Deputy Head of Department »III-V Photovoltaics and Concentrator Technology«. His current research interests include high efficiency PV cell design, advanced PV cell architectures with elevated voltage, III-V absorber materials tailored for laser light conversion, power by light system development, thin-film processing, back mirrors and photonic structures, photon recycling and luminescence coupling.

Dr. Helmers studied physics and philosophy in Oldenburg and in Lund, Sweden. He holds a doctoral degree in physics from University of Oldenburg (2013, summa cum laude: highest distinction); for his PhD he held a scholarship of the German Federal Environmental Foundation (DBU). He authored and coauthored more than 50 scientific papers and filed 5 patents.

Publications

Publication list from the Fraunhofer-Publica database:

YearTitle/AuthorDocument Type
20214-Junction GaAs Based Thin Film Photonic Power Converter with Back Surface Reflector for Medical Applications
Schauerte, M.; Höhn, O.; Wierzkowski, T.; Keller, G.; Helmers, H.		Conference Paper
202168.9% Efficient GaAs-Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		Journal Article
202168.9% Efficient GaAs-Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance. Cover Picture
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		Journal Article
2021Current Mismatch and Luminescence Coupling in Three-junction Photonic Power Converters with and without Back Reflector
Lopez, E.; Höhn, O.; Schauerte, M.; Lackner, D.; Schachtner, M.; Reichmuth, S.K.; Helmers, H.		Conference Paper
2021Experimental Coupling Process Efficiency and Benefits of Back Surface Reflectors in Photovoltaic Multi-junction Photonic Power Converters
Lopez, E.; Höhn, O.; Schauerte, M.; Lackner, D.; Schachtner, M.; Reichmuth, K.; Helmers, H.		Journal Article
2021Free Space Optical Link for Simultaneous Power and 1 Gb/s Data Transmission
Fakidis, J.; Helmers, H.; Haas, H.		Conference Paper
2021Integrated series/parallel connection for photovoltaic laser power converters with optimized current matching
Wagner, L.; Reichmuth, S.K.; Philipps, S.P.; Oliva, E.; Bett, A.W.; Helmers, H.		Journal Article
2021New Frontiers in III-V based Photonic Power Converters
Helmers, H.		Conference Paper
2021Non-Uniform Illumination Impacts on O-Band InGaAsP and Metamorphic GaInAs Photonic Power Converters
Beattie, M.; Helmers, H.; Valdivia, C.E.; Lackner, D.; Höhn, O.; Hinzer, K.		Conference Paper
2021Pushing the Boundaries of Photovoltaic Light to Electricity Conversion: A GaAs Based Photonic Power Converter with 68.9% Efficiency
Helmers, H.; Lopez, E.; Höhn, O.; Lackner, D.; Schön, J.; Schauerte, M.; Schachtner, M.; Dimroth, F.; Bett, A.W.		Conference Paper
2021Technical Boundaries of Micro-CPV Module Components: How Small is Enough: Presentation held at 17th International Conference on Concentrating Photovoltaic Systems (CPV), Online Conference, Germany, 12.-14. April 2021
Wiesenfarth, M.; Martínez, J.F.; Steiner, M.; Iankov, D.; Nitz, P.; Dimroth, F.; Helmers, H.		Presentation
2021Technical Boundaries of Micro-CPV Module Components: How Small is Enough?: Paper presented at 17th International Conference on Concentrating Photovoltaic Systems, CPV 2021, Online, Germany, 12.-14.04.2021
Wiesenfarth, M.; Iankov, D.; Martínez, J.F.; Nitz, P.; Steiner, M.; Dimroth, F.; Helmers, H.		Presentation
2021Thin film GaAs solar cell enabled by direct rear side plating and patterned epitaxial lift-off
Wulf, J.; Oliva, E.; Mikolasch, G.; Bartsch, J.; Dimroth, F.; Helmers, H.		Conference Paper
2021Voltage losses due to the perimeter and dark area in micro-concentrator solar cells
Wiesenfarth, M.; Steiner, M.; Helmers, H.; Bett, A.W.		Journal Article
202051% Efficient Photonic Power Converters for O-Band Wavelengths around 1310 nm
Helmers, H.; Franke, A.; Lackner, D.; Höhn, O.; Predan, F.; Dimroth, F.		Conference Paper
20206-W Optical Power Link with Integrated Optical Data Transmission
Helmers, H.; Armbruster, C.; Ravenstein, Moritz von; Derix, D.; Schöner, C.		Journal Article
2020Development and analysis of wafer-bonded four-junction solar cells based on antimonides with 42% efficiency under concentration
Predan, F.; Höhn, O.; Lackner, D.; Franke, A.; Helmers, H.; Dimroth, F.		Journal Article
2020Power-by-Light or How to Reach an Efficiency of 68%?: Presentation held at SiliconFOREST 2020, Falkau, Germany, 01.03.2020-04.03.2020
Helmers, H.		Presentation
2020Simultaneous Wireless Data and Power Transfer for a 1-Gb/s GaAs VCSEL and Photovoltaic Link
Fakidis, J.; Helmers, H.; Haas, H.		Journal Article
2020Wafer-bonded GaInP/GaAs/GaInAs//GaSb four-junction solar cells with 43.8% efficiency under concentration
Predan, F.; Franke, A.; Hoehn, O.; Lackner, D.; Helmers, H.; Siefer, G.; Bett, A.W.; Dimroth, F.		Conference Paper
20195 W Optical Power Link with Generic Voltage Output and Modulated Data Signal: Presentation held at 1st Optical Wireless and Fiber Power Transmission Conference 2019, Yokohama, Japan, 23.04.2019-25.04.2019
Haid, M.; Armbruster, C.; Derix, D.; Schöner, C.; Helmers, H.		Presentation
2019Comprehensive Electrical Loss Analysis of Monolithic Interconnected Multi-Segment Laser Power Converters
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Journal Article
2019GaAs Multi-Junction Laser Power Converters at AZUR SPACE. Current Status and Development Activities: Presentation held at 1st Optical Wireless and Fiber Power Transmission Conference 2019, Yokohama, Japan, 23.04.2019-25.04.2019
Keller, G.; Fuhrmann, D.; Wierzowski, T.; Volk, A.-K.; Fuhrmann, B.; Horst, L.; Wächter, C.; Schauerte, M.; Helmers, H.; Khorenko, V.		Presentation
2019Highly Efficient III-V Based Photovoltaic Laser Power Converters: Presentation held at 1st Optical Wireless and Fiber Power Transmission Conference 2019, Yokohama, Japan, 23.04.2019-25.04.2019
Helmers, H.; Höhn, O.; Lackner, D.; Lopez, E.; Ruiz-Preciado, L.; Schauerte, M.; Siefer, G.; Dimroth, F.; Bett, A.W.		Presentation
20180.5-Gb/s OFDM-Based Laser Data and Power Transfer Using a GaAs Photovoltaic Cell
Fakidis, J.; Videv, S.; Helmers, H.; Haas, H.		Journal Article
2018Luminescent Coupling in Multi-Junction Photovoltaic Devices Studied by Transient Voltage Measurements: Presentation held at 35th European Photovoltaic Solar Energy Conference and Exhibition 2018, Brussels, Belgium, 24.09.2018-28.09.2018
Tayagaki, T.; Reichmuth, S.K.; Helmers, H.; Siefer, G.		Presentation
2018On the influence of the photo-induced leakage current in monolithically interconnected modules
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Journal Article
2018Optische Leistungsversorgung für Sensorsysteme mittels photovoltaischer Laserleistungszellen: Vortrag gehalten auf der 9. GMM Fachtagung "Energieautonome Sensorsysteme" 2018, Dresden, Germany, 28.02.2018
Helmers, H.		Presentation
2018Photovoltaisches Halbleiterbauelement zur Konversion von Strahlungsleistung in elektrische Leistung, Verfahren zu dessen Herstellung und dessen Verwendung
Helmers, Henning; Höhn, Oliver; Walker, Alexandre Wiliam		Patent
2018Power loss mechanisms in small area monolithic-interconnected photovoltaic modules
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Journal Article
2018Power-by-Light - Optical Power Transmission Based on Photovoltaic Laser Power Converters: Presentation held at ACT Science Coffee 2018, Noordwijk, Netherlands, 15.06.2018
Helmers, H.		Presentation
2018Transient Analysis of Luminescent Coupling Effects in Multi-junction Solar Cells
Tayagaki, T.; Reichmuth, S.K.; Helmers, H.; Siefer, G.		Journal Article
2017GaInP/AlGaAs metal-wrap-through tandem concentrator solar cells
Oliva, E.; Salvetat, T.; Jany, C.; Thibon, R.; Helmers, H.; Steiner, M.; Schachtner, M.; Beutel, P.; Klinger, V.; Moulet, J.-S.; Dimroth, F.		Journal Article
2017Multi-segment photovoltaic laser power converters and their electrical losses
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Conference Paper
2017On the alignment tolerance of photovoltaic laser power converters
Wagner, L.; Bett, A.W.; Helmers, H.		Journal Article
2017On the temperature dependence of dual-junction laser power converters
Reichmuth, S.K.; Helmers, H.; Philipps, S.P.; Schachtner, M.; Siefer, G.; Bett, A.W.		Journal Article
2017Power loss mechanisms in monolithic-interconnected six-segment laser power converter: Presentation held at 53rd International Conference on Microelectronics, Devices and Materials, MIDEM 2017, Ljubljana, Slovenia, October 4th - October 6th, 2017
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Presentation
2017Reliable and lightning-safe monitoring of wind turbine rotor blades using optically powered sensors
Worms, K.; Klamouris, C.; Wegh, F.; Meder, L.; Volkmer, D.; Philipps, S.P.; Reichmuth, S.K.; Helmers, H.; Kunadt, A.; Vourvoulakis, J.; Bett, A.W.; Koos, C.; Freude, W.; Leuthold, J.; Stork, W.		Journal Article
2016Determining the optimal laser wavelength for laser power conversion depending on operation temperature
Höhn, O.; Walker, A.W.; Bett, A.W.; Helmers, H.		Conference Paper
2016III-V multi-junction Metal-Wrap-Through (MWT) concentrator solar cells
Oliva, E.; Salvetat, T.; Jany, C.; Thibon, R.; Helmers, H.; Steiner, M.; Schachtner, M.; Beutel, P.; Klinger, V.; Moulet, J.; Dimroth, F.		Conference Paper
2016Influence of injection current and temperature on electroluminescence of GaAs laser power converters: Presentation held at 3rd Euroregional Workshop on Photovoltaics & Nanophotonics 2016, Ljubljana, Slovenia, 21.09.2016-23.09.2016
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Presentation
2016Integrated Power and Data Transceiver Devices for Power-by-Light Systems - A Concept Study
Helmers, H.; Lackner, D.; Siefer, G.; Oliva, E.; Dimroth, F.; Bett, A.W.		Conference Paper
2016Optical power supply of smart sensors using photovoltaic laser power converters: Presentation held at microTEC Südwest Clusterkonferenz 2016, Freiburg, Germany, 14.03.2016-15.03.2016
Helmers, H.		Presentation
2016Optimal laser wavelength for efficient laser power converter operation over temperature
Höhn, O.; Walker, A.W.; Bett, A.W.; Helmers, H.		Journal Article
2016Photovoltaic laser power converters for wireless optical power supply of sensor systems
Helmers, H.; Bett, A.W.		Conference Paper
2016Spatial and spectral electroluminescence for single-junction single-segment GaAs laser power converter characterization: Presentation held at 52nd International Conference on Microelectronics, Devices and Materials, MIDEM 2016, and the Workshop on Biosensors and Microfluidics, September 28th - September 30th, 2016, Ankaran, Slovenia
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Presentation
2016Temperature and injection current dependent electroluminescence for evaluation of single-junction single-segment GaAs laser power converter
Kimovec, R.; Helmers, H.; Bett, A.W.; Topic, M.		Journal Article
2016Transient I-V Measurement Set-up for Photovoltaic Laser Power Converters under Monochromatic Irradiance
Reichmuth, S.K.; Helmers, H.; Garza, C.E.; Vahle, D.; Boer, M. de; Stevens, L.; Mundus, M.; Helmers, H.; Bett, A.W.; Siefer, G.		Conference Paper
2015A high-efficiency hybrid high-concentration photovoltaic system
Zimmermann, S.; Helmers, H.; Tiwari, M.K.; Paredes, S.; Michel, B.; Wiesenfarth, M.; Bett, A.W.; Poulikakos, D.		Journal Article
2015Impact of Photon Recycling and Luminescence Coupling in III-V Photovoltaic Devices
Walker, A.; Höhn, O.; Micha, D.; Wagner, L.; Helmers, H.; Dimroth, F.; Bett, A.		Conference Paper
2015Impact of photon recycling and luminescence coupling on III-V single and dual junction photovoltaic devices
Walker, A.W.; Höhn, O.; Micha, D.N.; Wagner, L.; Helmers, H.; Bett, A.W.; Dimroth, F.		Journal Article
2015Photovoltaic Cells with Increased Voltage Output for Optical Power Supply of Sensor Electronics
Helmers, H.; Wagner, L.; Garza, C.E.; Reichmuth, S.K.; Oliva, E.; Philipps, S.P.; Lackner, D.; Bett, A.		Conference Paper
2014III-V Solarzellen für die optische Leistungsübertragung: Vortrag gehalten bei AG Optische Kommunikation meets AG Solartechnik, Freiburg, Germany, 21.03.2014
Helmers, Henning		Presentation
2014Lightning-Safe Monitoring of Wind Turbine Rotor Blades Using Optically Powered Sensors
Worms, K.; Klamouris, C.; Wegh, F.; Meder, L.; Volkmer, D.; Phillips, S.; Reichmuth, S.K.; Helmers, H.; Bett, A.W.; Vourvoulakis, J.; Freude, W.; Leuthold, J.; Stork, W.		Conference Paper
2014Modeling of concentrating photovoltaic and thermal systems
Helmers, H.; Bett, A.W.; Parisi, J.; Agert, C.		Journal Article
2014Photovoltaic cells for optical power and data transmission: Presentation held at 34. European Telemetry and Test Conference, etc 2014, Nürnberg, Germany, 03.06.2014-05.06.2014
Helmers, H.; Philipps, S.P.; Reichmuth, S.K.; Oliva, E.; Lackner, D.; Bett, A.W.		Presentation
2014Photovoltaic cells for optical power and data transmission: Presentation held at Forum Innovative Testing @ SENSOR+TEST 2014, Nürnberg, Germany, 04.06.2014
Helmers, H.		Presentation
2014Temperature-dependent electroluminescence and voltages of multi-junction solar cells
Karcher, C.; Helmers, H.; Schachtner, M.; Dimroth, F.; Bett, A.W.		Journal Article
2013Advanced liquid cooling in HCPVT systems to achieve higher energy efficiencies
Zimmermann, S.; Helmers, H.; Tiwari, M.K.; Escher, W.; Paredes, S.; Neves, P.; Poulikakos, D.; Wiesenfarth, M.; Bett, A.W.; Michel, B.		Conference Paper
2013Bandgap determination based on electrical quantum efficiency
Helmers, H.; Karcher, C.; Bett, A.W.		Journal Article
2013Cogeneration of photovoltaic electricity and heat using concentrated solar radiation
Helmers, H.		Dissertation
2013Efficiency of dense-array CPVT module with front-side interconnected cells
Polonsky, G.; Shelef, G.; Flitsanov, Y.; Wiesenfarth, M.; Steiner, M.; Helmers, H.; Bett, A.W.; Kribus, A.		Conference Paper
2013Influence of temperature and irradiance on triple-junction solar subcells
Helmers, H.; Schachtner, M.; Bett, A.W.		Journal Article
2013The Interaction of Standards and Innovation: Hybrid Photovoltaic-thermal Collectors
Kramer, K.; Helmers, H.		Journal Article
2013Investigations on the influence of temperature and concentration on solar cell performances
Helmers, H.; Schachtner, M.; Bett, A.W.		Conference Paper
2013Ko-Generation von Elektrizität und Wärme aus konzentriertem Sonnenlicht: Überblick über Technologie und Anwendungen
Helmers, H.		Book Article
2013Multi-linear performance model for hybrid (C)PVT solar collectors
Helmers, H.; Kramer, K.		Journal Article
2013Optical analysis of deviations in a concentrating photovoltaics central receiver system with a flux homogenizer
Helmers, H.; Thor, W.Y.; Schmidt, T.; Rooyen, D.W. van; Bett, A.W.		Journal Article
2013Photovoltaische Zellen zur optischen Leistungsübertragung: Vortrag gehalten beim Treffen der AG Optische Kommunikation 2013, Stuttgart, Germany, 22.11.2013
Helmers, H.		Presentation
2013Temperature dependent electroluminescence and voltages of multi-junction solar cells
Karcher, C.; Helmers, H.; Schachtner, M.; Dimroth, F.; Bett, A.W.		Conference Paper
2012Advanced concepts in concentrating photovoltaics (CPV)
Wiesenfarth, M.; Helmers, H.; Philipps, S.P.; Steiner, M.; Bett, A.W.		Conference Paper
2012Front-side interconnected large area concentrator cells for compact concentrator modules
Wiesenfarth, M.; Steiner, M.; Helmers, H.; Siefer, G.; Oliva, E.; Dimroth, F.; Shelef, G.; Polonsky, G.; Flitsanov, Y.; Kribus, A.; Bett, A.W.		Conference Paper
2012Outdoor test setup for concentrating photovoltaic and thermal (CPVT) systems
Helmers, H.; Boos, A.; Jetter, F.; Heimsath, A.; Wiesenfarth, M.; Bett, A.W.		Conference Paper
2011Halbleiterbauelement im Mehrschichtaufbau und hieraus gebildetes Modul
Wiesenfarth, Maike; Guter, Wolfgang; Helmers, Henning		Patent
2011Recent advances in the development and testing of hybrid PV-thermal collectors
Dupeyrat, P.; Helmers, H.; Fortuin, S.; Kramer, K.		Conference Paper
2010Advanced processing techniques used for the development of dual-junction monolithic interconnected modules
Helmers, H.; Oliva, E.; Bronner, W.; Dimroth, F.; Bett, A.W.		Conference Paper
2010Processing techniques for monolithic interconnection of solar cells at wafer level
Helmers, H.; Olivia, E.; Bronner, W.; Dimroth, F.; Bett, A.W.		Journal Article
2009Increasing the efficiency of fluorescent concentrator systems
Goldschmidt, J.C.; Peters, M.; Bösch, A.; Helmers, H.; Dimroth, F.; Glunz, S.W.; Willeke, G.		Journal Article
This publication list has been generated from the publication database Fraunhofer-Publica.