Advanced Functional and Structural Thin Films and Coatings: Thin Films and Nanostructures for Optoelectronics I
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Adele Carrado, University of Strasbourg; Ramana Chintalapalle, University of Texas at El Paso; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Nancy Michael, University of Texas at Arlington; Karine Mougin, Cnrs, Is2m; Heinz Palkowski, Clausthal University of Technology; Nuggehalli Ravindra, New Jersey Institute of Technology; Vikas Tomar, Purdue University
Wednesday 2:00 PM
March 17, 2021
Room: RM 19
Location: TMS2021 Virtual
Session Chair: Gerald Ferblantier, ICUBE; Ramana Chintalapalle, UTEP
2:00 PM Keynote
Multi-photon Microfabrication: from Direct Laser Writing to 4D Microprinting: Arnaud Spangenberg1; 1IS2M
Multi-photon microfabrication (MPM) based on photopolymerization enables the production of 2D microstructures for opto-electronics by taking advantage of the very localized matter-laser interaction, both in space and time. MPM has also emerged as a very popular 3D microfabrication method since it can be seen as an extension of 3D printer at the microscale. This technology has proven its unrivalled ability to sculpt the matters at that scale, as highlighted by major breakthroughs in various fields. Today, one remaining challenge concerns the development of advanced materials to build functional microdevices for opto-electronical applications. In that context, I will introduce basic principles related to MPM, then I will discuss how one can take advantage of MPM to facilitate the integration of advanced materials for sensors applications. A special attention will be paid to the difficulties encountered to process functional materials and to the role of the processing parameter on their final properties.
2:45 PM
Facile Synthesis of 3D Dendritic Gold Nanostructures Assisted by a Templated Growth Process: Application at the Detection of Traces of Molecules: Karine Mougin1; Pierre Bauer1; 1Is2m Cnrs
Nowadays, noble metallic nanostructures with unique morphology are widely used as new sensors due to their fascinating properties. Among various shapes, dendritic nanostructures have attracted much attention because of their large surface-to-volume ratio, high sensitivity and special texture with sharp tips and nanoscale junctions. Several methods have been developed to fabricate those specific structures such as electrodeposition, seed-mediated growth or wet chemical method. The present study deals with a novel approach for a controlled growth pattern-directed organisation of Au flower-like crystals deposited onto stainless steel plates to achieve large-scale functional surfaces. Results seem to offer attractive perspectives for the conception of a MEMS platform, which could detect traces of specific molecules, differentiate them and regenerate after use. In addition, it opens new routes for the qualitative and quantitative detection of very low concentration of absorbed molecules onto nanostructured surfaces incorporated in a microchip.
3:10 PM Keynote
Highly Doped Si Metasurfaces Obtained by Coupling Top Down and Out of Equilibrium Approaches: Jean-Marie Poumirol1; Clément Majorel1; Nicolas Chery1; Meiling Zhang1; Christian Girard1; Nicolas Mallet2; Filadelfo Cristiano2; Peter Wiecha2; Guilhem Larrieu2; Sébastien Kerdiles3; Anne-Sophie Royet3; Pablo Acosta3; Vincent Paillard1; Caroline Bonafos1; 1Cemes Cnrs; 2LAAS-CNRS; 3CEA-LETI
The appearance of LSPR in highly doped Si nanostructures opens a new field of applications, with Si-based plasmonic tunable over a wide infrared range.We propose a new approach consisting at optimizing the doping of thin silicon layers, by means of Laser Thermal Annealing, in which nanometer size disks are produced by low energy electron beam lithography. Hence, dense hexagonal arrays of 50 nm sized nanodisks have been obtained on phosphorus doped SOI wafers. Recrystallisation processes and P redistribution during LTA have been investigated by HREM and STEM-EDX. Active dopant concentration in the bulk SOI as high as 4 at. % have been deduced from Hall effect and FTIR measurements. Finally, intense and tunable (blueshift with the P content) far-IR LSPR have been observed in FTIR on the doped nanodisks metasurfaces in good agreement with Green Dyadic method predictions, revealing subtle effects linked to the underlying substrate and structuration.
3:55 PM
Key Mechanical Test Methods to Characterize Optically Clear Adhesives: Mobin Yahyazadehfar1; Aref Samadi1; Leopoldo Carbajal1; Mark Lamontia1; 1DuPont
Flexible Cover Window is a multi-layer stack that is designed to protect foldable displays from impact and scratch. In this design, rigid polymer films are co-extruded or bonded together using an Optically Clear Adhesive (OCA). While being very tacky, OCAs are usually ultra-soft martials (E< 10 MPa) that can sustain large shear strains (>500%). In addition to strong adhesion, an OCA can provide several other mechanical benefits. For example, due to its low modulus, an OCA layer can prompt splitting the neutral axes of the rigid layers during bending which reduces the maximum bending strain and allows tight bending radii. In addition, OCAs can enhance the impact performance of the cover window through absorbing part of the applied mechanical energy during such loading conditions. In this study, we introduced key mechanical test methods to identify suitable OCA candidates for flexible phone Cover window.
4:15 PM
Spin Coating of Doped-silica on Czochralski-Silicon for Enhanced Radiative Properties: Sufian Abedrabbo1; EL Mostafa Benchafia1; Anthony Fiory2; Nuggehalli Ravindra2; 1Khalifa University; 2New Jersey Institute of Technology
Silica sol-gel based on tetraethyl orthosilicate and various dopants is deposited on ordinary Czochralski silicon. The films are processed to engineer random strain fields that modulate the Si bandgap yielding enhanced radiative properties. In this talk, a comparative study of erbium doped silica by two different processing techniques is presented. The role of erbium is to increase the interfacial stress fields and will not directly affect the radiative recombination by upconversion. Other types of samples are synthesized using optically inactive trivalent dopants. The photoluminescence spectra of the processed samples are compared. SEM and TEM images of the interfaces are presented and estimates on the effects of strain fields on the bandgap are investigated by studying the X-ray diffraction spectra. Correlations of the nature of the stresses and their effects on the radiative recombination of free-carriers in Si will be discussed.