Publication date: 11th March 2026
A detailed understanding of photogenerated charge carriers in lead halide perovskites is essential for moving beyond empirical optimization toward the rational design of next-generation perovskite-based optoelectronic and photovoltaic devices[1]. In this work, we investigate the photophysical origin of photoluminescence in perovskite materials.
We perform temperature-dependent steady-state and time-resolved absorption and photoluminescence measurements on a set of representative systems, including inorganic CsPbBr₃ thin films, CsPbI₃ nanoparticles, and hybrid MAPbBr₃ single crystals. The evolution of optical spectra and recombination dynamics over a wide temperature range provides direct experimental access to the nature of the photogenerated species across different perovskite material classes.
The experimental results are then compared with predictions based on the Saha model, which is commonly used to describe the thermal equilibrium between excitons and free charge carriers. While this model captures basic trends, it neglects several effects known to be significant in lead halide perovskites, such as non-parabolic band dispersions, defect states, dielectric screening, many-body interactions, and carrier–carrier and carrier–lattice coupling. Deviations between model predictions and experimental observations highlight the limitations of this simplified framework.
Finally, by analyzing the temperature-dependent evolution of spectral line shapes and recombination dynamics using numerical modeling, we extract fundamental parameters that characterize the nature of the photogenerated charge carriers and their interaction with phonons[2-4]. This comprehensive approach provides a refined, physically grounded picture of photoluminescence in lead halide perovskites under device-relevant conditions.
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