Session Overview |
Green photonics, energy, and related technologies - Bloc 3Room: Cartier 2 |
Date: Wednesday, June 06 |
08:30 |
Fully Printed, ZnO Photodetectors for Ultraviolet Sensing
Main Author: Anubha A Gupta Organization: École de technologie supérieure, Canada We report fully aerosol jet printed Zinc Oxide metal-semiconductor-metal (MSM) photodetectors for sensing on the ultraviolet range from 250 nm to 400 nm. The operation of these devices is based on Schottky barrier modification under the influence of oxygen adsorption and desorption. The ZnO semiconductor nano-crystal network having porous morphology contributes to their high performance metrics. The porosity of the semiconductor material increases the surface area-to-volume ratio, thereby enhancing the ON/OFF ratios and response speed. In addition, the complete fabrication process of these devices is carried out below 150C, which makes the processing of these devices possible on low temperature substrates, such as, paper and plastic. |
08:45 |
Control And Characterization Of Organic Solar Cell Morphology Through Variable-Pressure Solvent Vapour Annealing
Main Author: Derek Zomerman Organization: University of Saskatchewan, Canada Organic photovoltaics (OPVs) are lightweight, flexible, and solution processable, which facilitates their use in wearable and integrated electronics. Morphology control in OPV active layers is essential to device performance. Solvent vapour annealing (SVA) is a common method of post-deposition film processing; however, the current “bell jar” technique lacks control over vapour concentration, leading to poor reproducibility. Herein an advanced SVA technique will be discussed that allows for precise control over annealing conditions such as solvent vapour concentration, and annealing and drying times. OPV active layers were annealed at various chloroform vapour concentrations and their morphologies were examined using in-situ UV-Visible spectroscopy, grazing incidence wide angle X-ray scattering (GIWAXS), and photo-induced force microscopy (PiFM). OPVs annealed at different chloroform vapour concentrations were then tested to correlate film morphology to device performance. |
09:00 |
Virtual substrate engineering with nanoporous semiconductors and graphene-based nanocomposites
Main Author: Abderraouf Boucherif Organization: Université de Sherbrooke, Canada In this talk, I will review recent research on virtual substrate engineering by using mesoporous crystalline materials as well as the use of graphene and other 2D materials for strain engineering at the nanoscale. These substrates would serve as templates for the epitaxial growth of a wide range of semiconductor materials which includes GaAs, GaN, Ge and SiGe alloys. This opens new opportunities for applications in the field of energy harvesting, optoelectronics and SWIR cameras. |
09:25 |
Metasurface Cavities for LED Efficiency Enhancement
Main Author: Luzhou Chen Organization: École Polytechnique de Montréal, Canada Light trapping loss due to the small escape cone at high refractive index contrast interfaces is one of the major issues in power conversion efficiency of light emitting diodes (LEDs). In this work, we propose two different metasurface design strategies that can effectively reduce light trapping and hence enhance the light extraction efficiency in LEDs. |
09:40 |
A Plasmonic antenna Polarization-sensitive Near-Infrared Photo-detector
Main Author: Jean-Michel Nunzi Organization: Queen's University, Canada Plasmonic nanostructures can generate energetic “hot” electrons from light in a broadband fashion depending on their shape, size and arrangement. Such structures have a promising use in photodetectors, allowing high speed, broadband, and multi-color photodetection. Because they function without a bandgap absorption, photon detection at any energy would be possible through engineering of the plasmonic nanostructure. Herein, a compact hot electron-based photodetector that combines polar-ization sensitivity and circularly polarized light detection in the near infrared region was fabricated using an ITO-Au hybrid layer. Furthermore, the sensitivity of the device was significantly increased by adding a poled Azo molecular glass film in a capacitor configuration. The resulting device is capable of detecting light below the ITO bandgap at ambient temperature without any bias voltage. This photodetector, which is amenable to large-area fabrication, can be integrated with other nano-photonic and nanoplasmonic structures for operation at telecom wavelengths |
10:05 |
Optical Rectennas to Harvest Visible and Infrared Frequencies
Main Author: David Duche Organization: Aix Marseille Univ, Univ Toulon, CNRS, IM2NP, France We study and develop 3rd generation solar cells composed of plasmonic nano-antennas made of silver nano-cubes associated with rectifying self assembled molecular diodes (or rectenna) to directly convert light into DC current. Using an opto-electrical model, we discuss through simulations whether molecular diodes can be used as rectifying diodes in optical rectennas. Both the geometry of plasmonic nano-antennas and the design parameters of the molecular rectifyers have been optimized. Plasmonic molecular rectennas |