Title: The Rise of Halide Perovskites: From Durable and Efficient Photovoltaics, Solar Fuels to Quantum Emitters
Speaker: Prof. Aditya Mohite, Rice University, USA
Abstract: Two-dimensional (2D) halide perovskites are a sub-class of 3D perovskites, which have emerged as a new class of solution-processed organic-inorganic (hybrid) low- dimensional semiconductors. They imbibe their properties from four exciting classes of novel materials - quantum wells, atomically thin 2D materials, organic semiconductors, and 3D halide perovskites. There is growing consensus that their physical properties are dictated by the interaction between the organic cation and the inorganic framework, which presents a unique opportunity to tailor their behaviours. Moreover, the 2D perovskites have demonstrated technologically relevant durability in contrast to the 3D perovskites and their synergistic integration with 3D perovskites has demonstrated the path for overcoming the issue of long-term durability in halide perovskite-based optoelectronic devices. In this talk I will describe our work over the past five years on 2D perovskites ranging from novel fundamental light-induced structural behaviors and its impact on charge transport, solvation dynamics to control homogeneity of layer thickness and the synergy between 2D and 3D perovskites in achieving durable and high-efficiency photovoltaic devices. Finally, if time permits, I will also present some new results, which offer an exciting prospect for developing arrays of electrically driven single photon emitters.
Key References: 1. Metcalf et al, Two-dimensional perovskite templates for durable and efficient formamidinium solar cells Science (2024 in press). 2. Hou et al, Synthesis of 2D perovskite crystals via progressive transformation of quantum well thickness Nature Synthesis (2024) 3. Ultrafastrelaxationoflatticedistortionin2DperovskitesNaturePhysics(2023) 4. Sidhik et al, Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells Science 2022 Vol 377, Issue 6613 pp. 1425-1430 5. Li W et al, Light-activated interlayer contraction in two-dimensional perovskites for high-efficiency solar cells. Nat Nanotechnol. 2022 Jan;l 7(1):45-52. 6. Sidhik et al, MemorySeedsEnableHighStructuralPhasePurityin2DPerovskiteFilms for High-Efficiency Devices. Adv Mater. 2021 Jul;33(29):e2007176. 7. Blancon JC et al, Semiconductorphysicsoforganic-inorganic2Dhalideperovskites. Nature Nanotechnol. 2020 Dec; 15(12):969-985.