Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Nitrides: Devices
HL 2.10: Talk
Monday, April 1, 2019, 12:00–12:15, H31
Blue micro-LEDs on Si(111) for optogenetic applications — •Silvio Neugebauer1, Jürgen Bläsing1, Armin Dadgar1, André Strittmatter1, Martin Deckert2, Bertram Schmidt2, Michael Lippert3, and Frank Ohl3 — 1Institute of Physics, Otto-von-Guericke-University Magdeburg, Germany — 2Institute for Micro and Sensor Systems, Otto-von-Guericke-University Magdeburg, Germany — 3Department of System Physiology and Learning, Leibniz Institute for Neurobiology Magdeburg, Germany
Optogenetics is a technique that builds on light-sensitive proteins to control neural activity in genetically modified neurons. In order to circumvent problems associated with the use of single optical fibers for excitation, arrays of miniaturized LEDs on a flexible host are a viable solution allowing in addition for a light-patterning approach. In this study we have optimized InGaN/GaN LED heterostructures on Si(111) substrates with low total layer thickness and their processing into micro-sized LEDs for the integration onto flexible polyimide membranes. Special emphasis was put on obtaining stress-free wafers after growth and to keep the thickness of the layer stack below 5 µm. Subsequently, arrays of circular µLEDs with diameters from 60-160 µm were fabricated. Devices exhibit constant J-V characteristics for the range of diameters investigated. We will further report on full-wafer removal of the silicon substrate to obtain freestanding µLEDs that can be transferred one-by-one onto a polyimide optical electrode.