Forschungsnews

Efficient power electronic converters need high blocking strength and low on-state resistance. We demonstrate successful laser lift off based transfer of vertical GaN pn-diodes from sapphire to tungsten, enabling true vertical conduction and reducing resistance by half.

Blue-violet emitting laser diodes tend to form SiO_x deposits on the facet, causing unstable laser thresholds and beam characteristics. A suited facet coating, together with a hermetically sealed TO can, can avoid this effect and enable complex optical applications.

We demonstrate that high-temperature PECVD SiNx passivation layers enable controlled stress engineering in GaN-HEMTs. Our approach specifically shifts the threshold voltage up to 1.4 V, supporting the development of tailored transistors for future applications.

Using in-situ and ex-situ optical metrology, we have optimized VCSEL growth and etching processes. This ensures precise layer control, aligning emission wavelengths efficiently and enabling “first time right” production of these complex devices for space applications.

We have developed a highly scalable 400 nm InP HBT process with f_max> 500 GHz. The technology offers precise control, consistent performance, and improved efficiency, contributing to advancements in high-frequency communication systems.

We have proposed a new design for a photonic crystal surface emitting laser diode (PCSEL). Our approach enables high-efficiency generation of multi-Watt optical power in a narrow circular beam, using an all-semiconductor photonic crystal structure.

Simple yet precise trap characterization is crucial for optimizing device and model performance. At FBH, we have developed an innovative characterization technique using MHz load-line measurements to accurately analyze trapping effects under real-world conditions.

We’ve developed a novel micro-integrated quantum interferometer module, using entangled photons to detect microplastics in water. This compact, efficient technology enables mobile, cost-effective microplastic detection, addressing environmental and health concerns.