SUPERLASER Consortium Meets in Linköping for the First Progress Meeting
On 3–4 September, the SUPERLASER partners gathered in Linköping, Sweden, for the project’s first yearly progress meeting. Generously hosted by Linköping University, the consortium spent two productive days discussing progress across the different work packages and planning ahead for this crucial second year. Since the kick-off meeting in Athens, much has been achieved. 14 deliverables have already been submitted, and two major scientific deliverables are due in August 2025: the model predictor based on the τ factor (WP2) and the optical coherence measurement protocols (WP5).
At the progress meeting each work package reported on current progress, underscoring the international collaboration at the heart of this disruptive research.The meeting concluded with a tour of the laboratories at Linköping University, followed by a dinner in the historic centre of Linköping, where the consortium enjoyed traditional Swedish food.
Scientific Updates
• WP2 (University of Nottingham) presented the successful development of a machine-learning model to reliably predict stable perovskite phases. This model will be tested further as the focus shifts to mixed perovskites, seeking the right combinations of phases needed for the formation of superlattices.
• In WP 3 five SUPERLASER partners are working together to develop and test optimised transport materials. The objectives comprise developing both n-type electron injection layers (EILs), based on organic and inorganic materials — as well as p-type hole injection layers (HILs) from organic materials, ensuring efficient and balanced charge injection into the perovskite superlattice.
• WP4 (NCSR Demokritos) reported a major breakthrough in the development of lead-based perovskites. The team found that depending on the growth rate, crystals form different atomic planes — some more suitable than others for the project’s goals. At very slow growth rates, they detected moiré patterns between atomic planes, a structural feature that may pave the way toward three-dimensional moiré superstructures.
• WP5 (Linköping University) is responsible for measuring superradiance at room temperature. To this end the team successfully set up a cryostat and transient absorption (TA) spectroscopy system, enabling measurements from room temperature down to ~10 K. Using this setup, they recorded TA spectra of perovskite superlattice films and optimised a correction method for TA signals. As a result, a protocol for measuring optical coherence in perovskite superlattices has been successfully established, a key step towards measuring superradiance.
• WP 6 (imec) entails the fabrication of electrically pumper laser systems with perovskite crystals as gain material. It requires close collaboration between imec and Linköping Univeristy, who hold biweekly online meetings and exchange samples and data. Several intermediary objectives have already been reached, including the laser diode screening protocol, the ultrafast electrical pulsing setup, and the superradiant material screening protocol. Work is ongoing on resonator design and characterisation as well as high-performance PeLED fabrication.