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SUMMARY:MSE David P. Pope Distinguished Lecture: Ion Migration and Its Impact on the Stability of Halide Perovskite Solar Cells - Prashant Kamat - University of Notre Dame
DESCRIPTION:The ability to tune the bandgap of metal halide perovskites by alloying different halide ions is key to advancing tandem solar cells and light-emitting displays. However\, this compositional flexibility also introduces challenges\, most notably\, the photoinduced migration of halide ions\, which can degrade device performance. A prominent manifestation is photoinduced phase segregation in mixed-halide perovskites (MHPs)\, leading to the formation of iodide-rich and bromide-rich domains. These inhomogeneous regions act as charge carrier traps\, reducing device efficiency. The thermodynamic and redox characteristics of halide perovskites create a strong driving force for hole trapping and the oxidation of iodide species. As a result\, the mobility of halide ions and their vulnerability to hole-induced oxidation are major factors governing the long-term stability of perovskite solar cells. \n \nSurface passivation of 3D perovskites using 2D perovskites\, carbazole derivatives has been reported widely. However\, interfacial chemistry can pose significant challenges during long-term solar cell operation. Under light and heat\, cation migration can substantially alter the 2D/3D interface\, leading to performance degradation. Therefore\, suppressing both halide and cation migration is essential for enhancing the long-term stability and efficiency of perovskite solar cells and light-emitting devices. \nSuggested Readings: \nDuBose\, J. T.; Kamat\, P. V. Hole Trapping in Halide Perovskites Induces Phase Segregation\, Accounts of Materials Research 2022\, 3\, 761-771. \nDuBose\, J. T.; Kamat\, P. V. Energy Versus Electron Transfer: Managing Excited-State Interactions in Perovskite Nanocrystal–Molecular Hybrids\, Chemical Reviews 2022\, 122\, 12475–12494. \nChakkamalayath\, J.; Hiott\, N.; Kamat\, P. V. How Stable Is the 2D/3D Interface of Metal Halide Perovskite under Light and Heat?\, ACS Energy Letters 2023\, 8\, 169-171. \nSzabó\, G.; Kamat\, P. V.\, How Cation Migration across a 2D/3D Interface Dictates Perovskite Solar Cell Efficiency ACS Energy Letters 2024 9 (1)\, 193-200 \nChakkamalayath\, J. et al.\, Photon Management Through Energy Transfer in Halide Perovskite Nanocrystal–Dye Hybrids: Singlet vs Triplet Tuning. Accounts of Chemical Research 2025\, 58\, 1461–1472.
URL:https://seasevents.nmsdev7.com/event/mse-david-p-pope-distinguished-lecture-ion-migration-and-its-impact-on-the-stability-of-halide-perovskite-solar-cells-prashant-kamat-university-of-notre-dame/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Distinguished Lecture
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
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