1
|
Walsh C, Muttlak SG, Sadeghi M, Missous M. Miniature Integrated 2.4 GHz Rectennas Using Novel Tunnel Diodes. Sensors (Basel) 2023; 23:6409. [PMID: 37514704 PMCID: PMC10386477 DOI: 10.3390/s23146409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 06/26/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023]
Abstract
This work presents the design, fabrication, and measured results of a fully integrated miniature rectenna using a novel tunnel diode known as the Asymmetrical Spacer Layer Tunnel (ASPAT). The term rectenna is an abbreviation for a rectifying antenna, a device with a rectifier and antenna coexisting as a single design. The ASPAT is the centrepiece of the rectifier used for its strong temperature independence, zero bias, and high dynamic range. The antenna is designed to be impedance matched with the rectifier, eliminating the need for a matching network and saving valuable real estate on the gallium arsenide (GaAs) substrate. The antenna is fully integrated with the rectifier on a single chip, thus enabling antenna miniaturisation due to the high dielectric constant of GaAs and spiral design. This miniaturisation enables the design to be fabricated economically on a GaAs substrate whilst being comparable in size to a 15-gauge needle, thus unlocking applications in medical implants. The design presented here has a total die size of 4 × 1.2 mm2, with a maximum measured output voltage of 0.97 V and a 20 dBm single-tone 2.35 GHz signal transmitted 5 cm away from the rectenna.
Collapse
Affiliation(s)
- Christopher Walsh
- Department of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK
| | - Saad G Muttlak
- Department of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK
| | | | - Mohamed Missous
- Department of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK
| |
Collapse
|
2
|
Abstract
Quaternary metal chalcogenides have attracted attention as candidates for absorber materials for inexpensive and sustainable solar energy generation. One of these materials, bournonite (orthorhombic CuPbSbS3), has attracted much interest of late for its properties commensurate with photovoltaic energy conversion. This paper outlines the synthesis of bournonite for the first time by a discrete molecular precursor strategy. The metal dithiocarbamate complexes bis(diethyldithiocarbamato)copper (II) (Cu(S2CNEt2)2, (1)), bis(diethyldithiocarbamato)lead (II) (Pb(S2CNEt2)2, (2)), and bis(diethyldithiocarbamato)antimony (III) (Sb(S2CNEt2)3, (3)) were prepared, characterized, and employed as molecular precursors for the synthesis of bournonite powders and the thin film by solvent-less pyrolysis and spray-coat-pyrolysis techniques, respectively. The polycrystalline powders and thin films were characterized by powder X-ray diffraction (p-XRD), which could be indexed to orthorhombic CuPbSbS3. The morphology of the powder at the microscale was studied using scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDX) was used to elucidate an approximately 1:1:1:3 Cu/Pb/Sb/S elemental ratio. An optical band gap energy of 1.55 eV was estimated from a Tauc plot, which is close to the theoretical value of 1.41 eV.
Collapse
Affiliation(s)
- Yasser
T. Alharbi
- Department
of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Firoz Alam
- Department
of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Khaled Parvez
- Department
of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Mohamed Missous
- School
of Electrical and Electronic Engineering, The University of Manchester, Sackville Street, Manchester M13 9PL, U.K.
| | - David J. Lewis
- Department
of Materials, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| |
Collapse
|
3
|
Alharbi YT, Alam F, Salhi A, Missous M, Lewis DJ. Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors. Sci Rep 2021; 11:3053. [PMID: 33542323 PMCID: PMC7862388 DOI: 10.1038/s41598-021-82446-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 01/18/2021] [Indexed: 11/08/2022] Open
Abstract
Silver(I) ethylxanthate [AgS2COEt] (1) and antimony(III) ethylxanthate [Sb(S2COEt)3] (2) have been synthesised, characterised and used as precursors for the preparation of AgSbS2 powders and thin films using a solvent-free melt method and spin coating technique, respectively. The as-synthesized AgSbS2 powders were characterized by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. The crystalline AgSbS2 powder was investigated using XRD, which shows that AgSbS2 has cuboargyrite as the dominant phase, which was also confirmed by Raman spectroscopy. SEM was also used to study the morphology of the resulting material which is potentially nanostructured. EDX spectra gives a clear indication of the presence of silver (Ag), antimony (Sb) and sulfur (S) in material, suggesting that decomposition is clean and produces high quality AgSbS2 crystalline powder, which is consistent with the XRD and Raman data. Electronic properties of AgSbS2 thin films deposited by spin coating show a p-type conductivity with measured carrier mobility of 81 cm2 V-1 s-1 and carrier concentration of 1.9 × 1015 cm-3. The findings of this study reveal a new bottom-up route to these compounds, which have potential application as absorber layers in solar cells.
Collapse
Affiliation(s)
- Yasser T Alharbi
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Firoz Alam
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Abdelmajid Salhi
- Department of Electrical and Electronic Engineering, The University of Manchester, Sackville Street, Manchester, M13 9PL, UK
| | - Mohamed Missous
- Department of Electrical and Electronic Engineering, The University of Manchester, Sackville Street, Manchester, M13 9PL, UK
| | - David J Lewis
- Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| |
Collapse
|
4
|
Dawood OM, Gupta RK, Monteverde U, Alqahtani FH, Kim HY, Sexton J, Young RJ, Missous M, Migliorato MA. Dynamic modulation of the Fermi energy in suspended graphene backgated devices. Sci Technol Adv Mater 2019; 20:568-579. [PMID: 31231447 PMCID: PMC6567091 DOI: 10.1080/14686996.2019.1612710] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/18/2019] [Accepted: 04/25/2019] [Indexed: 06/09/2023]
Abstract
Freestanding (suspended) graphene films, with high electron mobility (up to ~200,000 cm2V-1s-1), good mechanical and electronic properties, could resolve many of the current issues that are hampering the upscaling of graphene technology. Thus far, attempts at reliably fabricating suspended graphene devices comprising metal contacts, have often been hampered by difficulties in exceeding sizes of 1 µm in diameter, if using UV lithography. In this work, area of suspended graphene large enough to be utilized in microelectronic devices, have been obtained by suspending a CVD graphene film over cavities, with top contacts defined through UV lithography with both wet and dry etching. An area of up to 160 µm2 can be fabricated as backgated devices. The suspended areas exhibit rippling of the surfaces which simultaneously introduces both tensile and compressive strain on the graphene film. Finally, the variations of the Fermi level in the suspended graphene areas can be modulated by applying a potential difference between the top contacts and the backgate. Having achieved large area suspended graphene, in a manner compatible with CMOS fabrication processes, together with enabling the modulation of the Fermi level, are substantial steps forward in demonstrating the potential of suspended graphene-based electronic devices and sensors.
Collapse
Affiliation(s)
- Omar M. Dawood
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
- School of Materials, University of Manchester, Manchester, UK
- Department of Physics, College of Education for Pure Science, University of Anbar, Anbar, Iraq
| | - Rakesh Kumar Gupta
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
- Manchester Institute of Biotechnology, University of Manchester, Manchester, UK
| | - Umberto Monteverde
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
| | - Faisal H. Alqahtani
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
- Physics Department, Faculty of Science, King Khalid University, Abha, Saudi Arabia
| | - Hong-Yeol Kim
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
| | - James Sexton
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
| | - Robert J. Young
- School of Materials, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - Mohamed Missous
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
| | - Max A. Migliorato
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
| |
Collapse
|
5
|
Salhi A, Alshaibani S, Alaskar Y, Albrithen H, Albadri A, Alyamani A, Missous M. Altering the Optical Properties of GaAsSb-Capped InAs Quantum Dots by Means of InAlAs Interlayers. Nanoscale Res Lett 2019; 14:41. [PMID: 30707322 PMCID: PMC6358628 DOI: 10.1186/s11671-019-2877-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Accepted: 01/27/2019] [Indexed: 06/09/2023]
Abstract
In this work, we investigate the optical properties of InAs quantum dots (QDs) capped with composite In0.15Al0.85As/GaAs0.85Sb0.15 strain-reducing layers (SRLs) by means of high-resolution X-ray diffraction (HRXRD) and photoluminescence (PL) spectroscopy at 77 K. Thin In0.15Al0.85As layers with thickness t = 20 Å, 40 Å, and 60 Å were inserted between the QDs and a 60-Å-thick GaAs0.85Sb0.15 layer. The type II emissions observed for GaAs0.85Sb0.15-capped InAs QDs were suppressed by the insertion of the In0.15Al0.85As interlayer. Moreover, the emission wavelength was blueshifted for t = 20 Å and redshifted for t ≥ 40 Å resulting from the increased confinement potential and increased strain, respectively. The ground state and excited state energy separation is increased reaching 106 meV for t = 60 Å compared to 64 meV for the QDs capped with only GaAsSb SRL. In addition, the use of the In0.15Al0.85As layers narrows significantly the QD spectral linewidth from 52 to 35 meV for the samples with 40- and 60-Å-thick In0.15Al0.85As interlayers.
Collapse
Affiliation(s)
- A. Salhi
- School of Electrical and Electronic Engineering, The University of Manchester, Sackville Street, Manchester, M13 9PL UK
- National Center for Nanotechnology and Advanced Materials, KACST, Riyadh, 11442 Saudi Arabia
| | - S. Alshaibani
- National Center for Nanotechnology and Advanced Materials, KACST, Riyadh, 11442 Saudi Arabia
| | - Y. Alaskar
- National Center for Nanotechnology and Advanced Materials, KACST, Riyadh, 11442 Saudi Arabia
| | - H. Albrithen
- Department of Physics and Astronomy, College of Sciences and Aramco Laboratory for Applied Sensors Research, KAIN, King Saud University, Riyadh, 11451 Saudi Arabia
| | - A. Albadri
- National Center for Nanotechnology and Advanced Materials, KACST, Riyadh, 11442 Saudi Arabia
| | - A. Alyamani
- National Center for Nanotechnology and Advanced Materials, KACST, Riyadh, 11442 Saudi Arabia
| | - M. Missous
- School of Electrical and Electronic Engineering, The University of Manchester, Sackville Street, Manchester, M13 9PL UK
| |
Collapse
|
6
|
Alanazi AM, Alam F, Salhi A, Missous M, Thomas AG, O'Brien P, Lewis DJ. A molecular precursor route to quaternary chalcogenide CFTS (Cu2FeSnS4) powders as potential solar absorber materials. RSC Adv 2019; 9:24146-24153. [PMID: 35527861 PMCID: PMC9069629 DOI: 10.1039/c9ra02926e] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 07/25/2019] [Indexed: 01/08/2023] Open
Abstract
In the present work we report on the synthesis of a tetragonal phase of stannite Cu2FeSnS4 powder from Sn(ii) and Sn(iv) using a solvent free melt method using a mixture of Cu, Fe, Sn(ii)/Sn(iv) O-ethylxanthates.
Collapse
Affiliation(s)
| | - Firoz Alam
- School of Chemistry
- University of Manchester
- Manchester
- UK
- School of Materials
| | - Abdelmajid Salhi
- School of Electrical and Electronic Engineering
- The University of Manchester
- Manchester
- UK
| | - Mohamed Missous
- School of Electrical and Electronic Engineering
- The University of Manchester
- Manchester
- UK
| | | | - Paul O'Brien
- School of Chemistry
- University of Manchester
- Manchester
- UK
- School of Materials
| | | |
Collapse
|
7
|
Bernardo-Gavito R, Bagci IE, Roberts J, Sexton J, Astbury B, Shokeir H, McGrath T, Noori YJ, Woodhead CS, Missous M, Roedig U, Young RJ. Extracting random numbers from quantum tunnelling through a single diode. Sci Rep 2017; 7:17879. [PMID: 29259286 PMCID: PMC5736612 DOI: 10.1038/s41598-017-18161-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 12/06/2017] [Indexed: 11/09/2022] Open
Abstract
Random number generation is crucial in many aspects of everyday life, as online security and privacy depend ultimately on the quality of random numbers. Many current implementations are based on pseudo-random number generators, but information security requires true random numbers for sensitive applications like key generation in banking, defence or even social media. True random number generators are systems whose outputs cannot be determined, even if their internal structure and response history are known. Sources of quantum noise are thus ideal for this application due to their intrinsic uncertainty. In this work, we propose using resonant tunnelling diodes as practical true random number generators based on a quantum mechanical effect. The output of the proposed devices can be directly used as a random stream of bits or can be further distilled using randomness extraction algorithms, depending on the application.
Collapse
Affiliation(s)
| | - Ibrahim Ethem Bagci
- School of Computing and Communications, Lancaster University, Lancaster, LA1 4WA, UK
| | - Jonathan Roberts
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
| | - James Sexton
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, M13 9PL, UK
| | - Benjamin Astbury
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
| | - Hamzah Shokeir
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
| | - Thomas McGrath
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
| | - Yasir J Noori
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
| | | | - Mohamed Missous
- School of Electrical and Electronic Engineering, University of Manchester, Manchester, M13 9PL, UK
| | - Utz Roedig
- School of Computing and Communications, Lancaster University, Lancaster, LA1 4WA, UK
| | - Robert J Young
- Physics Department, Lancaster University, Lancaster, LA1 4YB, UK.
| |
Collapse
|
8
|
Al-Shakban M, Matthews PD, Savjani N, Zhong XL, Wang Y, Missous M, O’Brien P. The synthesis and characterization of Cu 2ZnSnS 4 thin films from melt reactions using xanthate precursors. J Mater Sci 2017; 52:12761-12771. [PMID: 32025050 PMCID: PMC6979526 DOI: 10.1007/s10853-017-1367-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 07/06/2017] [Indexed: 05/25/2023]
Abstract
Kesterite, Cu2ZnSnS4 (CZTS), is a promising absorber layer for use in photovoltaic cells. We report the use of copper, zinc and tin xanthates in melt reactions to produce Cu2ZnSnS4 (CZTS) thin films. The phase of the as-produced CZTS is dependent on decomposition temperature. X-ray diffraction patterns and Raman spectra show that films annealed between 375 and 475 °C are tetragonal, while at temperatures <375 °C hexagonal material was obtained. The electrical parameters of the CZTS films have also been determined. The conduction of all films was p-type, while the other parameters differ for the hexagonal and tetragonal materials: resistivity (27.1 vs 1.23 Ω cm), carrier concentration (2.65 × 10+15 vs 4.55 × 10+17 cm-3) and mobility (87.1 vs 11.1 cm2 V-1 s-1). The Hall coefficients were 2.36 × 103 versus 13.7 cm3 C-1.
Collapse
Affiliation(s)
- Mundher Al-Shakban
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Peter D. Matthews
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Nicky Savjani
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Xiang L. Zhong
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Yuekun Wang
- School of Electrical and Electronic Engineering, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Mohamed Missous
- School of Electrical and Electronic Engineering, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| | - Paul O’Brien
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL UK
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL UK
| |
Collapse
|
9
|
Isa MM, Ahmad N, Mat Isa SS, Ramli MM, Khalid N, Nor NM, Kasjoo S, Missous M. Gate recess study for high thermal stability pHEMT devices. EPJ Web Conf 2017; 162:01047. [DOI: 10.1051/epjconf/201716201047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023] Open
|
10
|
Ian KW, Exarchos M, Missous M. A novel low temperature soft reflow process for the fabrication of deep-submicron (<0.35 μm) T-gate pseudomorphic high electron mobility transistor structures. Nanotechnology 2013; 24:055202. [PMID: 23324621 DOI: 10.1088/0957-4484/24/5/055202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a new and simple low temperature soft reflow process using solvent vapour. The combination of this soft reflow and conventional i-line lithography enables low cost, highly efficient fabrication at the deep-submicron scale. Compared to the conventional thermal reflow process, the key benefits of the new soft reflow process are its low temperature operation (<50 °C), greater shrinkage of the structure size (up to 75%) and better controllability. Gate openings reflowed from 1 μm to 250 nm have been routinely and reproducibly achieved by utilizing the saturation characteristics of the process. The feasibility of this soft reflow process is demonstrated in the fabrication of a 350 nm T-gate pseudomorphic high electron mobility transistor. By shrinking the gate length by a factor of three (from a 1 μm initial opening), the output current is improved by 60% (500 mA mm(-1) from 300 mA mm(-1)) and f(T) and f(MAX) are increased to 70 GHz (from 20 GHz) and 120 GHz (from 40 GHz) respectively. The proposed soft reflow could potentially be applied on other compatible substrates such as polymer based material for organic or thin film devices, potentially leading to many new possible applications.
Collapse
Affiliation(s)
- Ka Wa Ian
- School of Electrical and Electronic Engineering, University of Manchester, Sackville Street Building, Sackville Street, Manchester, M13 9PL, UK
| | | | | |
Collapse
|
11
|
|
12
|
Baker C, Gregory I, Evans M, Tribe W, Linfield E, Missous M. All-optoelectronic terahertz system using low-temperature-grown InGaAs photomixers. Opt Express 2005; 13:9639-9644. [PMID: 19503168 DOI: 10.1364/opex.13.009639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We demonstrate, for the first time, an all-optoelectronic continuous-wave terahertz photomixing system that uses low-temperature grown InGaAs devices both for emitters and coherent homodyne detectors. The system is compatible with fiber-optic excitation wavelengths, and we compare the performance to the more common LT-GaAs photomixers.
Collapse
|
13
|
Balocco C, Song AM, Aberg M, Forchel A, González T, Mateos J, Maximov I, Missous M, Rezazadeh AA, Saijets J, Samuelson L, Wallin D, Williams K, Worschech L, Xu HQ. Microwave detection at 110 Ghz by nanowires with broken symmetry. Nano Lett 2005; 5:1423-7. [PMID: 16178251 DOI: 10.1021/nl050779g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
By using arrays of nanowires with intentionally broken symmetry, we were able to detect microwaves up to 110 GHz at room temperature. This is, to the best of our knowledge, the highest speed that has been demonstrated in different types of novel electronic nanostructures to date. Our experiments showed a rather stable detection sensitivity over a broad frequency range from 100 MHz to 110 GHz. The novel working principle enabled the nanowires to detect microwaves efficiently without a dc bias. In principle, the need for only one high-resolution lithography step and the planar architecture allow an arbitrary number of nanowires to be made by folding a linear array as many times as required over a large area, for example, a whole wafer. Our experiment on 18 parallel nanowires showed a sensitivity of approximately 75 mV dc output/mW of nominal input power of the 110 GHz signal, even though only about 0.4% of the rf power was effectively applied to the structure because of an impedance mismatch. Because this array of nanowires operates simultaneously, low detection noise was achieved, allowing us to detect -25 dBm 110 GHz microwaves at zero bias with a standard setup.
Collapse
Affiliation(s)
- C Balocco
- School of Electrical and Electronic Engineering, University of Manchester, Manchester M60 1QD, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Uren M, Martin T, Hughes B, Hilton K, Wells A, Balmer R, Herbert D, Keir A, Wallis D, Pidduck AJ, Missous M. Channel Mobility in AlGaN/GaN HFETs on SiC and Sapphire Substrates. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/1521-396x(200212)194:2<468::aid-pssa468>3.0.co;2-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
15
|
Ke ML, Rimmer JS, Hamilton B, Evans JH, Missous M, Singer KE, Zalm P. Radiative transitions associated with hole confinement at Si delta -doped planes in GaAs. Phys Rev B Condens Matter 1992; 45:14114-14121. [PMID: 10001532 DOI: 10.1103/physrevb.45.14114] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
16
|
Dobaczewski L, Kaczor P, Missous M, Peaker AR, Zytkiewicz Z. Evidence for substitutional-interstitial defect motion leading to DX behavior by donors in AlxGa1-xAs. Phys Rev Lett 1992; 68:2508-2511. [PMID: 10045415 DOI: 10.1103/physrevlett.68.2508] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
17
|
Eaglesham DJ, Kiely CJ, Cherns D, Missous M. Electron diffraction from epitaxial crystals—a convergent-beam electron diffraction of the interface structure for NiSi2/Si and Al/GaAs. ACTA ACUST UNITED AC 1989. [DOI: 10.1080/01418618908219279] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|