Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F50: Physics of Perovskite Halides (invited session)Invited
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Sponsoring Units: GERA DMP Chair: Nancy Haegel, National Renewable Energy Laboratory Room: Room 320 |
Tuesday, March 7, 2023 8:00AM - 8:36AM |
F50.00001: Transient Lattice Dynamics of Metal Halide Perovskites Invited Speaker: Richard D Schaller Solution-processed metal halide perovskite compositions offer scalable synthesis as well as highly desirable optoelectronic properties. As such, these materials offer significant prospects for use in light absorption and emission technologies including solar cells, light emitting diodes, and lasers. We report studies of transient X-ray diffraction paired with temperature dependent diffraction and optical studies that probe the response of the lattice in these materials to optical excitation. Materials studied span 0D, 2D, and 3D dimensionality. In some cases, surprising evolution of lattice symmetry is observed as well as phase metastability. The findings offer insight regarding optical response of these materials and present opportunities. |
Tuesday, March 7, 2023 8:36AM - 9:12AM |
F50.00002: Light-induced structural dynamics in 2D halide perovskites Invited Speaker: Aditya Mohite Two-dimensional halide perovskites (2D-HaP) 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 behaviors. In this talk I will describe our work over the year on 2D-HaPs on understanding and tailoring light-induced structural behaviors, novel photo-physical behaviors, and charge transport for high-efficiency optoelectronic device, with technologically relevant durability. |
Tuesday, March 7, 2023 9:12AM - 9:48AM |
F50.00003: Perspective on solar energy materials, design and discovery, defects, disorder, and interfaces Invited Speaker: Stephan Lany The energy transition still faces a daunting math. Currently, more than three quarters of final energy consumption occurs in form of fuels vs less than one quarter in electricity. On the other hand, renewable energy additions come almost exclusively in the form of electricity (dominantly photovoltaics and wind). Thus, meeting the terawatt challenge requires enormous growth in renewables, sufficient to convert excess electricity into fuels, as well as the development of non-electricity based solar fuel technologies, for example via solar thermochemical routes. In this presentation, we will review successes and challenges in photovoltaic materials from silicon to CdTe to halide perovskites and potential emerging materials, with a particular perspective on the role of first principles calculations and predictions. Materials design and discovery is evolving to incorporate defects, disorder, and interfaces. These phenomena play also an important role in the thermochemical generation of hydrogen, allowing to utilize synergies between renewable electricity and fuels in computational research. At the same time, machine learning approaches are increasingly geared toward properties of non-ideal materials, for example defect formation, allowing the screening for more complex material behavior as needed for the respective applications. |
Tuesday, March 7, 2023 9:48AM - 10:24AM |
F50.00004: Tuning the interface of perovskites for efficient solar cells Invited Speaker: Bin Chen Understanding and controlling of interfaces in perovskite solar cells lie at the heart of their rapid efficiency progress. In this talk, I will focus on interface engineering in perovskite solar cells (e.g. energy alignment, doping and carrier dynamics), including the construction of heterostructures using multi-dimensional perovskites. I will discuss the synthesis of 2D perovskites atop of 3D bulk perovskite for surface passivation. The precise control over the dimensionality of these quantum-confined 2D thin layers enables us to achieve efficient carrier transport across the interface while maintaining desirable trap passivation. I will also discuss the effects of surface modifications on carrier recombination dynamics at interfaces between perovskite and carrier transport layers. The ability to tune interface conditions will be even more critical as we move towards multi-junction device architecture in pursuit of higher efficiency. |
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