Photonics materials - 6Virtual room: INO - 2
|Thursday, May 28|
PM-6-28-1 / Thinking about the surface of semiconductor nanocrystals
* Patanjali Kambhampati, McGill University, Canada
Semiconductor nanocrystals are dominated by their surface, yet their surface science remains their most poorly understood aspect. We focus on the model system of CdSe colloidal quantum dots which are synthesized via solution phase chemistry in coordinating ligands. How do these ligands electronically interact with the electronic states of the quantum dot? Are there vibrationally mode specific interactions one can see? Do the ligands perform any non-trivial electronic function beyond mere surface passivation? Can we characterize chemisorption vs physisorption of ligands on the surfaces of nanocrystals? We will explore a wide variety of ways in which ligands control the optoelectronic properties of semiconductor nanocrystals.
PM-6-28-2 / Design and fabrication of a compact gas sensor integrating a polymer microresonator and a 850nm VCSEL source
* Qingyue Li, LAAS-CNRS Univ Toulouse
Vincent Raimbault, LAAS-CNRS Univ Toulouse, France
Philippe Menini, LAAS-CNRS Univ Toulouse
Thierry Camps, LAAS-CNRS Univ Toulouse
Véronique Bardinal, LAAS-CNRS Univ Toulouse
A compact gas sensor integrating a polymer microresonator and a 850nm VCSEL source is designed for health and environmental applications. The overall system is optimized using simulation tools by considering cleanroom fabrication tolerances. First fabrication results on 3D printed lens for VCSEL collimation and 800nm period aluminum grating couplers are highlighted.
PM-6-28-4 / Substrate-assisted Transfer of Nanoparticles by Graphene on Metal-Organic Interfaces
* Muhammad Munir, Mcmaster, Canada
Ayse Turak, Mcmaster
Nanoparticles synthesized by reverse micelle templating cannot be formed directly on the top of active layer in organic and perovskite devices. In this work, we show a method of transferring the synthesized nanoparticles on top of an organic layer using a graphene based transfer printing technique. To confirm the successful transfer of nanoparticles, perovskite based methylammonium lead bromide (MAPBr) nanoparticles were used and their presence confirmed by Photoluminescence (PL).
PM-6-28-5 / Process Development for Optimizing Architectures for Quantum Dot Photodetectors
* Siva Sivoththaman, University of Waterloo, Canada
As colloidal quantum dot (CQD) based devices are investigated among the research community it is critical that reliable processes are implemented in device fabrication to avoid the uncertainties posed by the novel materials and to result in repeatable devices so that they can be systematically studied and optimized. A process for heterojunction Cu-In-S QD device arrays on 22x22mm glass substrates using lithography, maskless exposure, and shadow masks is presented along with optical measurements made possible through a backlit illumination set up. The process reliability and device performance are discussed.