Institute of High Pressure Physics

Nanoporous GaN has recently emerged as a potential alternative material for AlGaN in the cladding layers of nitride laser diodes (LDs) due to its high refractive index contrast to GaN, tunable with porosity.

In the next Thursday UNIPRESS seminar, dr inż. Marta Sawicka from our Institute, MBE Laboratory, will present the electrically pumped LDs with porous claddings and compare device characteristics with standard solutions. She will also present a novel concept of in-plane refractive index engineering involving selective area doping and material removal in the proces of electrochemical etching, that is proposed to fabricate photonic elements embedded inside the nitride structures.

The Seminar "Application of nanoporous GaN in nitride laser diodes” will be held on Thursday, July 27, 2023 at 15:00 on Zoom platform. To get the link to join the seminar, please contact us at dyrekcja@unipress.waw.pl

Development of societies and the world economy requires novel sources of cheap and clean energy. The Earth natural resources will suffice for 50-60 years and their use is burdened with leaving a significant carbon footprint.

In the next Thursday UNIPRESS seminar, dr inż. Andrzej Morawski from our Institute, head of the Superconductors Laboratory, will address the issue of energy storage focusing on "green" energy obtained from hydrogen. He will present a new construction developed by his team - a double-walled high-pressure hydrogen tank. The solution provides high density of stored energy and can find its application for mobile vehicles or backyard hydrogen storage systems. The hydrogen stored under pressure has a much lower unit price than liquid hydrogen, but its density is only slightly lower.

The Seminar “Hydrogen storage technologies at Unipress. Project summary and outlook” will be held on Thursday, June 29, 2023 at 15:00 on Zoom platform. To get the link to join the seminar, please contact us at dyrekcja@unipress.waw.pl

Vertical GaN power devices are promising candidates for future kV-class power electronics due to the wide bandgap and high critical electric field (EC) of GaN. Vertical architectures provide the possibility of downsizing the devices and increasing their reliability. However, still a few challenges have to be addressed such as selective area doping, Schottky contact formation and drift layer growth.

In the next Thursday UNIPRESS seminar, Kacper Sierakowski from our Institute, the Crystal Growth Laboratory, will present the current state of the art in ion implantation in GaN and summarize the recent progress in the design of Junction Barrier Schottky (JBS) diodes.

The Seminar “Magnesium ion implantation – key technology for GaN power electronics” will be held on Thursday, May 25, 2023 at 15:00 on Zoom platform. To get the link to join the seminar, please contact us at dyrekcja@unipress.waw.pl

The zero resistance and the expulsion of a magnetic field occurring in a superconducting material have huge potential for many practical applications, and seven Nobel prizes have been awarded in the last 100 years. Recently discovered iron-based superconductors (FBS) with high transition temperature (T_c) of 58 K became the second high-T_c-superconducting family after cuprate superconductors. The physical nature and application potential of FBS will be the subject of the next Institute Thursday Seminar.

Dr Shiv J. Singh from our institute, the Laboratory of Superconductors, will introduce the iron-based superconductors and discuss the pressure effects on superconductivity, flux pinning, and vortex dynamics of FBS under ambient and applied conditions, as well as the challenges and current progress.

The Seminar “Review of pressure effects on high-temperature iron-based superconductors” will be held on Thursday, April 27, 2023 at 15:00 on Zoom platform. To get the link to join the seminar, please contact us at dyrekcja@unipress.waw.pl