Late News Poster Session: Energy & Environment
Program Organizers: TMS Administration
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
D-44: Coadditive Engineering for High Open Circuit Voltage Nearly 1V in Tin-Based Perovskite Solar Cells: Ashraful Islam1; Emrul Kayesh1; 1National Institute for Materials Science (NIMS)
Currently, Sn-based perovskite materials are utilized as the highest-performing lead-free perovskite solar cells (PSC). The crystallization rate of FASnI3 precursor solution is very fast to form uniform and optimum grains. On the other hand, the FASnI3 has a facial tendency to oxidation from Sn2+ to Sn4+, resulting in loss of suitable semiconducting properties. To tackle both problems, we have performed coadditive engineering with two novel additives, one to control the crystallization rate and the other to retard the oxidation of FASnI3. We obtained smooth crystal grain with nearly zero Sn4+ content. The dark current density reached to a record of 3.5 X 10-16 mA/cm2, and the open circuit voltage at 0.99 V close to the theoretical value. The champion device exhibits a power conversion efficiency of 13.5% with high stability. This works highlights the deposition control for Sn-PSC and brings the nontoxic Sn-PSC one step closer to the application
D-37: Development of Xe Gas Recycling System: Chang-Hoon Kwak1; Ro Youngju1; Hong Eun Sun1; Shin Hye Sun2; Kim Jun Woo2; 1Samsung Electronics; 2Research Institute of Industrial Science and Technology
Due to the increased demand and limited supply of Xe gas caused by aerospace technology development and the risk of global economic crisis, the price of Xe required for the semiconductor production is constantly rising. In order to provide stable supply of Xe gas, we are planning to develop a Xe recycling technology that can adsorb, separate, and purify Xe gas discharged from the semiconductor production process. Therefore, it is crucial to develop a porous adsorbent that can selectively adsorb Xe gas from various gases discharged after semiconductor production. In this study, four types of zeolites and two types of metal organic frameworks are selected as Xe adsorbent candidates, and their Xe adsorption efficiency is evaluated through adsorption breakthrough tests. We are aiming to develop a recycling system that can purify and collect Xe gas emitted from the workplace through the surface adsorption study of zeolites and metal organic frameworks.
D-38: Photoelectron Extraction via Inserted Carbon Nanotube in Photosynthetic Cells and Analysis by Scanning Electrochemical Microscopy (SECM): Hyojin Gwon1; Hyun S. Ahn1; 1Yonsei University
Extraction of photosynthetic electrons from plant or algal cells is a sustainable and promising route for the utilization of solar energy. Moreover, cellular extraction of photosynthetic electrons is more d-urable than that from isolate membrane components (photosyste-ms I, II, or thylakoids) due to inherently higher stability of cells. Here we prepared carbon nanotubes (CNTs) as electron transport highway from the chloroplasts to the electrolyte solution outside of the algal cells. Cell/CNT hybrid exhibited efficient photoelectron e-xtraction, and the process was visualized by scanning electroche-mical microscopy (SECM). Photosynthetic electron transport was quantified in single cell level for the first time by SECM analysis, and extension of such understanding to device levels is planned.
D-39: Platinized Carbon Nanoelectrodes for Electrochemical Measurement of Reactive Oxygen and Nitrogen Species in Neural Stem Cells: Donghoon Lim1; Hyun S. Ahn1; 1Yonsei University
It is important to analyze how reactive oxygen and nitrogen species (ROS/RNS) in stem cells affect the differentiation process. To accomplish this, Nanoelectrodes that are small enough not to damage single cells are essential. In this work, we fabricated and characterized platinized carbon nanoelectrodes by pyrolysis of butane inside a quartz capillary and used them as scanning electrochemical microscopy (SECM) tips. Using this nanoelectrode, it was possible to measure the four major ROS/RNS (i.e., H2O2, ONOO-, NO•, and NO2-) in the cytoplasm of neural stem cells (NSCs). The four primary ROS/RNS in single NSCs was monitored using a four-step chronoamperometric method.
D-40: Spin-orbit Torque Switching Enabled by Uniaxial Magnetocrystalline Anisotropy: Shreyes Nallan1; Jian-Gang (Jimmy) Zhu1; 1Carnegie Mellon University
In this work, we present the creation of a material system with in-plane uniaxial magnetocrystalline anisotropy. This property enables the creation of scalable and uniform magnetic memories, as well as novel spin-torque devices. Uniaxial in-plane anisotropy is generated through crystalline epitaxy between platinum and cobalt layers on a single-crystal substrate. Its presence is confirmed by crystalline characterization and angle-dependent magnetic hysteresis measurements, and is shown to agree well with theoretical derivations and numerical simulations for an energy-based magnetostatic model.Furthermore, we investigate the interaction between this uniaxial in-plane anisotropy and the spin-transfer torque in a spin Hall switching device -- an interaction whose fundamental behavior is currently unknown. We examine the angular dependence of the critical switching current in such a system through theoretical analysis and time-resolved simulations based on the Landau-Lifshitz-Gilbert (LLG) equation. Finally, we discuss experimental validation of these theoretical results with a pillar-and-channel nanodevice.