1
|
Ursaki V, Braniste T, Zalamai V, Rusu E, Ciobanu V, Morari V, Podgornii D, Ricci PC, Adelung R, Tiginyanu I. Aero-ZnS prepared by physical vapor transport on three-dimensional networks of sacrificial ZnO microtetrapods. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2024; 15:490-499. [PMID: 38711580 PMCID: PMC11070954 DOI: 10.3762/bjnano.15.44] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 04/15/2024] [Indexed: 05/08/2024]
Abstract
Aeromaterials represent a class of increasingly attractive materials for various applications. Among them, aero-ZnS has been produced by hydride vapor phase epitaxy on sacrificial ZnO templates consisting of networks of microtetrapods and has been proposed for microfluidic applications. In this paper, a cost-effective technological approach is proposed for the fabrication of aero-ZnS by using physical vapor transport with Sn2S3 crystals and networks of ZnO microtetrapods as precursors. The morphology of the produced material is investigated by scanning electron microscopy (SEM), while its crystalline and optical qualities are assessed by X-ray diffraction (XRD) analysis and photoluminescence (PL) spectroscopy, respectively. We demonstrate possibilities for controlling the composition and the crystallographic phase content of the prepared aerogels by the duration of the technological procedure. A scheme of deep energy levels and electronic transitions in the ZnS skeleton of the aeromaterial was deduced from the PL analysis, suggesting that the produced aerogel is a potential candidate for photocatalytic and sensor applications.
Collapse
Affiliation(s)
- Veaceslav Ursaki
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
- Academy of Sciences of Moldova, Chisinau, Republic of Moldova
| | - Tudor Braniste
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Victor Zalamai
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Emil Rusu
- Institute of Electronic Engineering and Nanotechnology „D. Ghitu”, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Vadim Morari
- Institute of Electronic Engineering and Nanotechnology „D. Ghitu”, Technical University of Moldova, Chisinau, Republic of Moldova
| | - Daniel Podgornii
- Institute of Applied Physics, State University of Moldova, Chisinau, Republic of Moldova
| | | | - Rainer Adelung
- Department of Material Science, Kiel University, Kiel, Germany
| | - Ion Tiginyanu
- National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Republic of Moldova
- Academy of Sciences of Moldova, Chisinau, Republic of Moldova
| |
Collapse
|
2
|
Damilano B, Vézian S, Brault J, Ruterana P, Gil B, Tchernycheva M. Nanoporous GaN by selective area sublimation through an epitaxial nanomask: AlN versus Si xN y. NANOTECHNOLOGY 2023; 34:245602. [PMID: 36913723 DOI: 10.1088/1361-6528/acc3a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 03/12/2023] [Indexed: 06/18/2023]
Abstract
Nanoporous GaN layers were fabricated using selective area sublimation through a self-organized AlN nanomask in a molecular beam epitaxy reactor. The obtained pore morphology, density and size were measured using plan-view and cross-section scanning electron microscopy experiments. It was found that the porosity of the GaN layers could be adjusted from 0.04 to 0.9 by changing the AlN nanomask thickness and sublimation conditions. The room temperature photoluminescence properties as a function of the porosity were analysed. In particular, a strong improvement (>100) of the room temperature photoluminescence intensity was observed for porous GaN layers with a porosity in the 0.4-0.65 range. The characteristics of these porous layers were compared to those obtained with a SixNynanomask. Furthermore, the regrowth of p-type GaN on light emitting diode structures made porous by using either an AlN or a SixNynanomask were compared.
Collapse
Affiliation(s)
- B Damilano
- Université Côte d'Azur, CNRS, CRHEA, Rue B. Gregory, Valbonne, France
| | - S Vézian
- Université Côte d'Azur, CNRS, CRHEA, Rue B. Gregory, Valbonne, France
| | - J Brault
- Université Côte d'Azur, CNRS, CRHEA, Rue B. Gregory, Valbonne, France
| | - P Ruterana
- Centre de Recherche sur les Ions, les Matériaux et la Photonique, CIMAP-ENSICAEN, UMR 6252, 6 Boulevard Maréchal Juin 14050, Caen, France
| | - B Gil
- Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, F-34095 Montpellier, France
| | - M Tchernycheva
- Centre de Nanosciences et de Nanotechnologies (C2N), UMR 9001 CNRS, Université Paris-Saclay, 10 Boulevard Thomas Gobert, Palaiseau 91120, France
| |
Collapse
|
3
|
Wu CJ, Chen YY, Wang CJ, Shiu GY, Huang CH, Liu HJ, Chen H, Lin YS, Lin CF, Han J. Anisotropic properties of pipe-GaN distributed Bragg reflectors. NANOSCALE ADVANCES 2020; 2:1726-1732. [PMID: 36132299 PMCID: PMC9419737 DOI: 10.1039/c9na00743a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Accepted: 03/23/2020] [Indexed: 06/15/2023]
Abstract
We report here a simple and robust process to convert periodic Si-doped GaN/undoped-GaN epitaxial layers into a porous-GaN/u-GaN distributed Bragg reflector (DBR) structure and demonstrate its material properties in a high-reflectance epitaxial reflector. Directional pipe-GaN layers with anisotropic optical properties were formed from n+-GaN : Si layers in a stacked structure through a lateral and doping-selective electrochemical etching process. Central wavelengths of the polarized reflectance spectra were measured to be 473 nm and 457 nm for the pipe-GaN reflector when the direction of the linear polarizer was along and perpendicular to the pipe-GaN structure. The DBR reflector with directional pipe-GaN layers has the potential for a high efficiency polarized light source and vertical cavity surface emitting laser applications.
Collapse
Affiliation(s)
- Chia-Jung Wu
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Yi-Yun Chen
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Cheng-Jie Wang
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Guo-Yi Shiu
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Chin-Han Huang
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Heng-Jui Liu
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Hsiang Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University No.1, University Rd., Puli Township Nantou 545 Taiwan
| | - Yung-Sen Lin
- Department of Chemical Engineering, Feng Chia University Seatwen Taichung 407 Taiwan
| | - Chia-Feng Lin
- Department of Materials Science and Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University Taichung, 145 Xingda Rd., South Dist. Taichung 402 Taiwan
| | - Jung Han
- Department of Electrical Engineering, Yale University 15 Prospect St New Haven Connecticut 06511 USA
| |
Collapse
|