Bulletin of the American Physical Society
2016 Fall Meeting of the APS Ohio-Region Section
Volume 61, Number 12
Friday–Saturday, October 7–8, 2016; Bowling Green, Ohio
Session E1: Novel Materials for Energy and Environment II |
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Chair: Pavel Moroz, Bowling Green State University Room: 201 A |
Saturday, October 8, 2016 1:30PM - 1:42PM |
E1.00001: Increased Grain Size and Longer Photogenerated Carrier Life Time Achieved with Cd Incorporation in MAPbI$_{\mathrm{3}}$ Perovskite. Niraj Shrestha, Suneth Watthage, Zhaoning Song, Geethika Liyanage, Paul Roland, Adam Phillips, Michael Heben, Randy Ellingson We report that cadmium (Cd) incorporation in methylammonium lead iodide (MAPbI$_{\mathrm{3}})$ perovskite leads to increased average grain size and improved photogenerated carrier life time. Enhanced PL intensity and significantly higher carrier life time reflect the impact of a reduced density of grain boundaries and a concomitant reduction in recombination sites, in agreement with the observed increase in average grain size for those films incorporating Cd. Longer photogenerated carrier lifetimes concur with improved photoconversion efficiencies measured for perovskite solar cells utilizing Cd-doped perovskite absorbers. [Preview Abstract] |
Saturday, October 8, 2016 1:42PM - 1:54PM |
E1.00002: Density Stoke's Law for Particles having the Density Lower than the Surrounding Medium Arjun Krishnappa It has been observed from our experiments that Stoke's Law can be used only when the particle density is greater than the surrounding medium. When a microbubble is horizontally steered in a liquid, then the Stoke's Law can't be used to calculate the velocity or drag force. The reason underlying is that the density of the microbubble is lower than the density of the liquid. To overcome the problem, a modified Stoke's Law called ``Density Stoke's Law (DSL)'' is proposed. DSL works not only for the particles having the density lower than the surrounding medium, but also for the particles having the density greater than the surrounding medium. Therefore DSL can be considered as a general Stoke's Law. [Preview Abstract] |
Saturday, October 8, 2016 1:54PM - 2:06PM |
E1.00003: Spectroscopic Measurement of Electronic and Thermal Interconversion in Energy-Relevant Materials. Richard D. Schaller In order to produce energy efficient devices, thorough understanding of fundamental desired and undesired processes of energy and heat interconversion and migration are needed. I will present studies using time-resolved optical methods such as absorption and emission as functions of sample temperature or photon energy that aim to arrive at insights regarding energy transfer, electron transfer, and electron-phonon and phonon-phonon scattering events. Materials examined include nanoscale 0D and 2D semiconductors as well as bulk phase perovskites. [Preview Abstract] |
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