Advanced Functional and Structural Thin Films and Coatings: Thin Films and Nanostructures for Optoelectronics I
Sponsored by: TMS: Thin Films and Interfaces Committee
Program Organizers: Ramana Chintalapalle, University of Texas at El Paso; Adele Carrado, University of Strasbourg; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Karine Mougin, Cnrs, Is2m; Heinz Palkowski, Clausthal University of Technology; Nuggehalli Ravindra, New Jersey Institute of Technology
Thursday 8:30 AM
March 3, 2022
Room: 252B
Location: Anaheim Convention Center
Session Chair: Ramana Chintalapalle, University of Texas at El Paso; Gerald Ferblantier, Icube Laboratory - Strasbourg University; Karine Mougin, Cnrs, Is2m
8:30 AM Introductory Comments
8:40 AM
(CrMoTaVNb)Si2: A Novel Single-phase High Entropy Silicide Material: Aleksandra Vyatskikh1; Benjamin MacDonald2; Leonardo Velasco3; Alexander Dupuy2; Enrique Lavernia2; Julie Schoenung2; Horst Hahn3; 1University of California Irvine; 2University of California Irvine; 3Karlsruhe Institute of Technology
High entropy materials enable discovery of alloys and ceramics with novel functional and mechanical properties. Recently, high entropy silicides (HES) have been reported. HES are particularly intriguing due to their potential applications in microelectronics, where silicide materials are common. In this work, we identified two potential single-phase HES using the CALculation of PHAse Diagrams (CALPHAD) approach: the ternary (CrMoTa)Si2 and the quinary (CrMoTaVNb)Si2. We proceeded to synthesize both compositions experimentally via electron beam evaporation or magnetron sputtering. Deposition was followed by heat treatment in vacuum, which facilitated the solid-state reactions to form the desired compositions. With grazing incidence X-ray diffraction and energy-dispersive spectroscopy, we demonstrated that both the ternary (CrMoTa)Si2 and the quinary (CrMoTaVNb)Si2 HES formed a single phase with a C40 hexagonal crystal structure. Our experimental findings validated the initial CALPHAD phase formation predictions. Overall, our study reports the first experimental realization of a thin-film high entropy silicide material.
9:00 AM Invited
Ellipsometry Characterization of Plasmonic Responses of Nanoparticles: Aotmane En Naciri1; 1Université de Lorraine
We report recent advances in ellipsometric characterization of silver and gold nanoparticles (NPs). Three systems are investigated: films composed of Au NPs distributed in shape, films with a gradient of concentration of Ag NPs, and colloidal suspensions composed of Au NP chains. The authors show that ellipsometry is highly sensitive to the plasmon resonance of NPs. This later can be used as an efficient probe of the NP morphology. The ellipsometric results are systematically compared to those that are obtained by transmission electron microscopy.The authors demonstrate that quantitative insights such as the shape distribution, the concentration, and the organization of NPs can be extracted from ellipsometric spectra
9:30 AM
Numerical Study of Intrinsic Stresses in Perovskite-on-Si Solar Cells with Intermetallic Bonding: Seif Elbadry1; Tarek Hatem1; Salah Bedair2; 1The British University in Egypt; 2North Carolina State University
Organic-based perovskite semiconductors provide a suitable material candidate to fabricate optoelectronic devices such as solar cells due to its low deposition cost and high efficiency. On the other hand, silicon wafers provide a stable and cost-effective technology for electronics and opto-electronics industries. Combining both materials in photovoltaic solar cells, in what is called Multi-junction (MJ) solar cells, allows the absorbance of a broader range of wavelengths, improving the cell's photo to electrical energy conversion efficiency. Nevertheless, thermal stresses are generated during processing and operation of the perovskite/silicon layer due to the thermal mismatch between both materials. In the current study, different interfaces been explored to reduce intrinsic stresses and therefore decrease defects and therefore enhance stability and increase efficiency of perovskite thin-films. In particular, intermetallic bonding interfaces will be explored which give different results and different stress distribution. The effect of intermetallic bonding will be investigated in this paper.
9:50 AM Break
10:10 AM Invited
Bandgap Emission of Czochralski-silicon Coated with Spin-coated Silica Using Various Catalysis: Sufian Abedrabbo1; El Mostafa Benchafia1; Ahmad Al-Qawasmeh1; Nuggehalli Ravindra2; Anthony Fiory3; 1Khalifa University; 2New Jersey Institute of Technology; 3Integron Solutions LLC.
Spin coating technique is used to deposit silica on ordinary Czochralski silicon using various acidic catalysts. The films are processed to engineer random strain fields that modulate the Si bandgap to enhance the band edge emission. This talk will present a comparative study of erbium doped silica prepared by five different acid catalysts. One set of samples also have ytterbium as co-dopant for erbium for probing upconversion effects on erbium conventional band emission. The erbium doping concentration ranges from 0% to 6% atomic and the films are vacuum annealed at temperatures ranging from 500 °C to 900 °C. The talk will present details of analytical properties of the spin-coated films in addition to a presentation of the optical emission from the Er C-band and from Si bandgap. The effect of the acid catalyst on optical emission and on film properties will be revealed.
10:40 AM
Radiative Properties of Polymers: Airefetalo Sadoh1; Samiha Hossain1; Nuggehalli Ravindra1; 1New Jersey Institute of Technology
Certain polymeric materials are responsive to environmental stimuli such as temperature, pressure, electric field, etc. and present these changes as quantifiable variables. These materials are known as smart materials and have various applications including smart sensors in relation to thermochromic changes. These sensors are made of chromogenic materials which visually change color with respect to an external stimulus. Conventional materials have fixed emissivities which signifies that the radiance features are proportional to their surface temperatures. This in turn limits their abilities to a single thermal function. It is crucial that materials with dynamic radiative properties are developed to meet industrial and commercial demands. In this study, these dynamic mechanisms in relation to thermochromic properties of polymeric materials are evaluated. Phenomenological approaches have been utilized to simulate the emissivity of relevant polymer candidates.
11:00 AM
NOW ON DEMAND: Enhancing Light Emission Properties of c-Si by Developing Stresses on Silicon Surface via Sol-gel Ceramic Coatings: Ali Abdullah1; El Mostafa Benchafia1; Daneil Choi1; Sufian Abedrabbo1; 1Khalifa university
In this work, we present improved bandgap emission from CZ-Si facilitated by engineering special coatings known to perturb the Si bandgap that are prepared by one acid-catalyst and one base-catalyst. Comparative study for the two prepared sets of samples is presented. In particular, effect of catalyst-type and process parameters on the bandgap emission properties of c-Si will be shown. Presented data will include steady-state photoluminescence, variable angle spectroscopic ellipsometry results, atomic force microscopy and X-ray diffraction. Explanations for the varying luminescence intensities relation to various process parameters and film-dopant are given in light of strain-luminescence relation effect. Moreover, thickness of the films resulting from the sol-gel process will be related to the annealing temperatures.
11:20 AM Concluding Comments