The group uses many techniques to investigate charge carrier behaviour of semiconductor materials. One technique is time-resolved pump–probe photoluminescence (TRPPL). This is used to observe how excited charge carriers in a material evolve over time after being stimulated by light.

In TRPPL, a short laser pulse, called the pump, excites the material, creating electrons and holes. A second, time-delayed pulse, the probe, then interrogates the system at controlled time intervals by measuring the emitted photoluminescence or changes in optical response. By scanning the delay between the pump and probe pulses, the researchers can build a time-resolved picture of how carriers relax, migrate, and recombine. This allows direct measurements of carrier lifetimes, recombination rates, and diffusion processes, which are essential for understanding and optimizing optoelectronic materials.

The Dhyana 400BSI V3 plays a key role in this setup by enabling reliable detection of the weak emission signals that follow excitation. Its stable long exposures, low dark current and high sensitivity help preserve the true temporal evolution of carrier recombination and diffusion without the measurements being dominated by background noise, giving researchers clean data even at low signal levels.