Session Overview |
Green photonics, energy, and related technologies - Bloc 1Room: Cartier 2 |
Date: Tuesday, June 05 |
13:15 |
Perovskite Solar Cells: Probing Decomposition Mechanisms by in operando Grazing-Incidence Wide Angle X-ray Scattering
Main Author: Timothy Kelly Organization: University of Saskatchewan, Canada Currently lead halide perovskite solar cells have been produced with over 21% power conversation efficiency; however, these devices rapidly degrade when exposed to heat, light, and moisture. Although research into perovskite degradation pathways has led to improvements in device stability, there has been little direct insight into the effect of perovskite decomposition on device performance. Therefore, in order to better understand how humidity-induced perovskite decomposition affects cell performance, we have performed fully in operando grazing incidence wide angle X-ray scattering (GIWAXS) measurements on methylammonium lead iodide solar cells. We show that the formation of hydrate phases is not necessarily the most important device degradation pathway; rather, we have found that as water penetrates into the cell, the mobility of iodide ions increases, leading to corrosion of the silver top electrode. The same corrosion process occurs with gold top contacts, albeit at a slower rate. This work suggests that rigorous exclusion of moisture from perovskite solar cells is still an important factor in producing devices with long lifetime, but that designing corrosion-resistant electrodes may further help in producing long-lived cells. |
13:40 |
High-Efficiency Flexible Silicon Photovoltaics
Main Author: Nazir P. Kherani Organization: University of Toronto, Canada Over the last several decades silicon photovoltaics has experienced remarkable scientific and technological advances whereby silicon solar cells today are the dominant solar electric technology. While solar electricity today in many regions of the world is at grid-parity, photovoltaics has yet to evolve into an ubiquitous ultra-low-cost source of renewable electricity. In this regard, recent high-efficiency photovoltaic research focus has been on the development of novel solar materials, and in particular investigating the integration of novel photovoltaic devices with incumbent well-developed photovoltaic devices such as silicon solar cells. In contrast, this presentation will explore the potential of further development of silicon devices, and in particular paths toward 20-30% efficiency on single-junction ultra-thin flexible silicon. The talk will include an overview of key requisite elements, outline the state of the art, and present a potential trajectory. |
14:05 |
Raman spectroscopy of silicon nano-antenna
Main Author: Alexandre Merlen Organization: IM2NP, Université de Toulon, France, France Nano-antennas are useful tools to enhance light matter interaction. They play a growing role in detection (surface enhanced spectroscopies), photovoltaics or light emission. For dielectric nano-antenna the Raman scattering signal can be easily measured and considered as a quantitative probe to measure the light matter efficiency. We report such measurements for various silicon nanostructures. |
14:20 |
The Influence of Thermal Effects in Raman Strain Measurements
Main Author: Aura Lubio Organization: Université de Sherbrooke, Canada The laser induced thermal effects on the Raman stress measurements conducted on Through-Silicon-Vias (TSVs) are studied. Factors other than mechanical stress inducing a shift in the Raman silicon peak around the vias are discussed. |
14:35 |
Passive Bianisotropic Metasurface Window for Thermal Black-body Radiation Control
Main Author: Nima Chamanara Organization: École Polytechnique de Montréal, Canada A passive bianisotropic metasurface window for controlling thermal black-body radiation is presented. The metasurface controls the solar and environment black-body radiation and naturally channels thermal radiation in or out of a structure, without consuming any energy. The proposed structure has a great potential to reduce residential and commercial heating/cooling energy demands. |