This research originated from the PhD work and was further developed during his tenure track at Bahir Dar University (BDU) in collaboration with Dublin City University (DCU), Ireland. Laser-Induced Breakdown Spectroscopy (LIBS) is a widely used analytical technique for classifying and quantifying target materials, such as aluminum and Cu targets. Polarization-resolved LIBS is a simple way to enhance the signal-to-background ratio (SBR) by placing a polarizer in front of a detector that suppresses the continuum radiation during the early stages of plasma emission. The main driving force for polarization radiation is the electron velocity distribution function (EVDF) translated to radiative recombination of plasma emission. His experimental research at the University of Antwerp involved nanosecond pump–probe absorption spectroscopy to investigate wide bandgap semiconductors, specifically chromium-doped bismuth sillenite (Bi₁₂SiO₂₀, BSO), under both high- and low-temperature conditions. We examined the relaxation dynamics of undoped and Cr-doped BSO, modeling the optical density relaxation using double and stretched-exponential decay fits. This analysis revealed the presence of both shallow and deep trap states in BSO. Notably, the stretched-exponential decay provided an excellent fit for the Cr-doped BSO crystal, indicating that its dynamics are governed primarily by quantum tunneling processes rather than conventional trapping mechanisms.

In his recent experimental work at Oregon State University, within the Micro and Femto Energetics Lab in the Department of Physics, they have fabricated perovskite solar cells in n-i-p and p-i-n configurations with varying proportions in collaboration with Oxford University, UK. Over the nine months, we have been characterizing these devices using ultrafast photocurrent mapping to analyze fill factors, efficiencies, and, more importantly, the sub-band states associated with defects and grain boundaries in the perovskite solar cells, utilizing their unique setup. Additionally, they determined the energy band gap of 1.6 eV under different excitations by measuring the device’s emission spectrum using Fluorometer Spectroscopy across a broad wavelength range, from UV to NIR. Furthermore, ongoing ultrafast transient absorption spectroscopic studies are examining carrier relaxation and exciton recombination dynamics on perovskite solar cell devices.