Bulletin of the American Physical Society
2021 Joint Spring Meeting of the Texas Sections of APS, AAPT and Zone 13 of the SPS
Volume 66, Number 2
Thursday–Sunday, April 8–11, 2021; Virtual
Session D05: APS: Condensed Matter and Plasma Physics I |
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Sunday, April 11, 2021 10:00AM - 10:12AM |
D05.00001: Density Limit for Plasma Space-Charge Based Electrostatic Ion Confinement Kelly Wood, Carlos Ordonez A numerical study is reported on the ion density limit for ions electrically confined by the space charge of an electron plasma. A self-consistent finite-difference evaluation of the electrostatic potential is carried out for a non-neutral plasma that follows a Boltzmann density distribution. The ion density is expected to be limited by a limitation on the maximum electric field at the plasma's boundary. A parameter study is carried out to find the functional dependence that the normalized electric field at the boundary has on the following parameters: the positive plasma charge density at the center of the configuration normalized by the magnitude of the electron charge density at the edge, the average charge state of the positive plasma particles multiplied by the ratio of the electron temperature to the temperature of the positive species, and the distance from the plasma's edge to the center of the configuration. The normalized dependence is fit with a function and the function is used to find the conditions for the highest ion density. [Preview Abstract] |
Sunday, April 11, 2021 10:12AM - 10:24AM |
D05.00002: First Principle Hybrid Density Functional Theory Study of Halide Perovskite Surfaces and Interfaces Eric Welch, Alex Zakhidov Perovskite materials continue to revolutionize multiple optoelectronic fields with applications in solar cells, light emitting diodes, photodetectors and lasers. High quality devices are developed with low-cost precursors at room temperature using solution processing. Computational studies have been used to predict new perovskites and transport layer interfaces as well as describe the photophysics of already-made devices so perovskite-based technologies can reach their full potential. We show here hybrid density functional theory calculation on the interface between an inorganic perovskite (CsPbBr$_{\mathrm{3}})$ and inorganic hole transport layer (CuI). Band offset calculations between CsPbBr$_{\mathrm{3\thinspace }}$and CuI reveal the tunability of the interface offset potential through varied material thickness, where the offset converges for structures over nine-unit cells thick. Experiments have recently been published showing the viability of CuI as a hole transport layer in perovskite-based devices. [Preview Abstract] |
Sunday, April 11, 2021 10:24AM - 10:36AM |
D05.00003: Electronic stopping power in perovskites for space applications Rosty Martinez, Mario Borunda Electronic stopping power describes the energy transfer rate to electrons in material during ion irradiation. We calculate electronic stopping power in triple-cation perovskites (formamidinium, methylammonium, and cesium). These materials have some of the highest power conversion efficiencies for perovskite-based photovoltaics. From simulations we can estimate the stopping process of ions and this would have implications for the use of photovoltaic devices for space missions. [Preview Abstract] |
Sunday, April 11, 2021 10:36AM - 10:48AM |
D05.00004: Structural and Optical Stability of Bilayer and Few-Layer MoS$_{\mathrm{2}}$ in Ambient Air. John Femi-Oyetoro, Kevin Yao, Evan Hathaway, Yan Jiang, Ibikunle Ojo, Brian Squires, Arup Neogi, Jingbiao Cui, Usha Philipose, Jose Perez We investigate the stability of MoS$_{\mathrm{2}}$ in ambient air, with a focus on monolayers, bilayers, twisted bilayers with large twist angles, and few-layers. The samples are grown using chemical vapor deposition on SiO$_{\mathrm{2}}$ substrates and studied atomic force microscopy (AFM), and Raman and photoluminescence spectroscopy. We find that as-grown bilayers with twist angles of 0$^{\mathrm{o}}$ and 60$^{\mathrm{o}}$ are remarkably structurally stable in comparison to monolayers that significantly structurally degrade in ambient air. Bilayers with 0$^{\mathrm{o}}$ twist angles synthesized using transfer of monolayers on top of one another are also found to be stable. Few-layers with twist angles of 0$^{\mathrm{o}}$ with number of layers n $=$ 3-6 are also stable. However, we find that transferred twisted bilayers with twist angles of about 10$^{\mathrm{o}}$ are significantly unstable in ambient air. Possible explanations for these observations will be discussed. [Preview Abstract] |
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