Speaker
Description
Metal halide perovskites have emerged as a highly promising class of semiconductors for optoelectronic applications due to their exceptional light absorption, tunable emission, and efficient charge transport. These cost-effective materials have demonstrated an unprecedented rise in solar power conversion efficiency, surpassing 25% within a decade, outpacing conventional silicon photovoltaics. However, fundamental insights into their intrinsic photophysical properties remain incomplete, yet are crucial for further performance enhancements. Additionally, while the impressive efficiency of novel perovskite materials is often emphasized, their long-term stability is equally vital for practical implementation.[1,2]
In this talk, I will present the development of perovskite systems with diverse compositions, structures, and morphologies using various synthesis strategies. By employing advanced spectroscopic techniques, we elucidate the interplay between crystalline structure and charge carrier dynamics that dictate their optoelectronic performance.[3,4] Additionally, photoluminescence (PL) microscopy imaging is being exploited correlating materials’ photochemistry and intrinsic defects to optoelectronic device performance, providing direct insight into their function in real-world applications.[5,6] I will demonstrate how chemical micro-engineering can optimize perovskite stability and functionality, with a focus on improving X-ray detection performance.[7,8] Finally, I will present strategies for fabricating high-quality flexible photoactive layers [9], including controlled film deposition, as critical components for next-generation stable optoelectronics.
References
[1] Jin, H.; Zeng, Y.; Steele, J.A.; Roeffaers, M.B.J.; Hofkens, J.; Debroye, E. Phase Stabilization of Cesium Lead Iodide Perovskite toward Efficient Optoelectronic Devices. NPG Asia Mater. 2024, 16, 24
[2] Jin, H.; Debroye, E.; Keshavarz, M.; Scheblykin, I.; Roeffaers, M.; Hofkens, J.; Steele, J. It’s a Trap! On the Nature of Localised States and Charge Trapping in Lead Halide Perovskites. Mater. Horiz. 2020, 7, 397
[3] Jin, H.; Steele, J.; Cheng, R.; Parveen, N.; Roeffaers, M.; Hofkens, J.; Debroye E. Experimental Evidence of Chloride-Induced Trap Passivation in Lead Halide Perovskites through Single Particle Blinking Studies. Adv. Opt. Mater. 2021, 2002240
[4] Yuan, H.; Debroye, E.; Bladt, E.; Lu, G.; Keshavarz, M.; Janssen, K.; Roeffaers, M.; Bals, S.; Sargent, E.; Hofkens, J. Imaging Heterogeneously Distributed Photo‐Active Traps in Perovskite Single Crystals. Adv. Mater. 2018, 30, 13, 1705494
[5] Seth, S.; Louis, B.; Asano, K.; Van Roy, T.; Roeffaers, M.B.J.; Debroye, E.; Scheblykin, I.G.; Vacha, M.; Hofkens, J. Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging. Chem. & Biomed. Imaging 2025, 3, 4, 244
[6] Mukherjee, A.; Reynaerts, R.; Pradhan, B.; Seth, S.; Rösch, A.T.; Banerjee, T.; Chouhan, L.; Jin, H.; Sternemann, C.; Paulus, M.; Leoncino, L.; Mali, K.S.; De Feyter, S.; Roeffaers, M.B.J.; Meijer, E.W.; Hofkens, J.; Debroye, E. Machine learning for microscopy data analytics targeting real-time optical characterization of semiconductor nanocrystals. Nature Commun., 2026, 10.1038/s41467-026-68939-7
[7] Valli, D.; Vanden Brande, R.; Herreman, V.; Li, Q.; Romolini, G.; Chen, J J.-K.; Shameem, K.M.M; Sun, L.; Zhao, Q.; Pradhan, B.; Hofkens, J.; Debroye, E. Noble Metal Doping in Lead-Free Double Perovskite Single Crystals: Achieving Near-Infrared to X-ray Broadband Photodetection. Small Science, 2025, 5, 8, 2500135
[8] Keshavarz, M.; Debroye, E.; Ottesen, M.; Martin, C.; Zhang, H.; Fron, E.; Küchler, R.; Steele, J.; Bremholm, M.; Van de Vondel, J.; Wang, H.; Bonn, M.; Roeffaers, M.; Wiedmann, S.; Hofkens, J. Tuning the Structural and Optoelectronic Properties of Cs2AgBiBr6 Double Perovskite Single Crystals Through Alkali Metal Substitution. Adv. Mater. 2020, 32, 40, 2001878
[9] Li, Q.; Valli, D.; Vanden Brande, R.; Rizzi, G.; Hofkens, J.; Qu, W.; Debroye, E. Bifunctional Polymer Assisted Growth of Crack-free Thick Perovskite Films for Flexible X-ray Detection. J. Mater. Chem. C. 2026, 10.1039/D6TC00075D