Chair of Institute for Optoelectronics

Prof. Dr. sc. Techn. Bernd Witzigmann

Friedrich Alexander University Erlangen-Nürnberg

Faculty of Electrical Engineering

Semiconductors

Our group works on semiconductor photonic devices and systems for sensing, communications, energy conversion and lighting. We develop numerical simulation models and perform characterization at the device level. Previous examples include design studies of semiconductor nanowire array absorbers, resulting in record-efficiency solar cells [1] and high gain photodetectors [2]. In the field of solid-state lighting, mechanisms of efficiency limitations have been discovered in the light-matter interaction [3]. Currently, control of single photons for quantum information processing in optical cavities and their scaling properties for systems is being  investigated (Fig.).

  1. InP nanowire array solar cells achieving 13.8% efficiency by exceeding the ray optics limit, J. Wallentin, et al., Science 339(6123), 1057–1060 (2013)
  2. High Responsivity of InP/InAsP Nanowire Array Broadband Photodetectors Enhanced by Optical Gating, Mohammad Karimi, et al., Nano Lett. 2019, 19, 8424−8430
  3. Effect of Auger recombination and leakage on the droop in InGaN/GaN quantum well LEDs, F Römer, et al., Optics express 22 (106), A1440-A1452, 2014

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