ORC’s PhD student Riku Isoaho successfully defended his doctoral dissertation on November 16, 2022. Visiting Professor James A. Gupta from University of Ottawa, Canada, acted as the opponent for the public defense. During the defense, the opponent and the defendant had an insightful and thorough scientific discussion about the relevant aspects of the dissertation. The published doctoral dissertation titled, “Narrow Bandgap (0.7–0.9 eV) Dilute Nitride Materials for Advanced Multijunction Solar Cells “, is available online.