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lattice mismatch
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Reducing Misfit Dislocations in Green Semi-Polar Light-Emitting Diodes
Aug 26, 2016University of California Santa Barbara (UCSB) in the USA has used limited-area epitaxy (LAE) on semi-polar gallium nitride (GaN) substrates to reduce misfit dislocation (MD) densities in multiple quantum well (MQW) green light-emitting ...
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Gallium Arsenide Phosphide Solar Cells on Silicon with Record 12% Efficiency
Aug 26, 2016Yale University and University of Illinois Urbana in the USA have improved the efficiency of gallium arsenide phosphide (GaAsP) solar cells on silicon (Si) by reducing threading dislocation densities (TDDs) [Kevin Nay Yaung et al, Appl. ...
Tags: GaAsP solar cells, GaAsP, MBE, MOCVD
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LayTec Adds Nanoscale SPC for Quaternary Films to Epinet 2016 Analysis Software
Jul 27, 2016In its newsletters in April 2016 and June 2015 in-situ metrology system maker LayTec AG of Berlin, Germany reported on x-ray diffraction (XRD)-gauged nk database improvements for InGaAsP (indium gallium arsenide phosphide) and InGaAlAs ...
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Correcting Charge Polarization Calculations for III-Nitrides
Jul 7, 2016Researchers at University of California Santa Barbara (UCSB) and Rutgers University in the USA believe that charge polarization in III-nitride materials has not been adequately understood up to now [Cyrus E. Dreyer et al, Phys. Rev. X vol6, ...
Tags: semiconductors, Electronics
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Epitaxial Growth of Laser Diodes on Wafer-Bonded InP/Si Substrates
Jun 12, 2016Sophia University in Japan has developed a technique for growing laser diodes on an indium phosphide (InP) layer bonded to silicon (Si) [Keiichi Matsumoto et al, Appl. Phys. Express, vol9, p062701, 2016]. The researchers claim that this is ...
Tags: Laser Diodes, Si Substrates
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ORNL-Led Group Grows Aligned Monolayers of Lattice-Mismatched Semiconductors
Apr 21, 2016Led by the Department of Energy's Oak Ridge National Laboratory (ORNL), a group of researchers has synthesized a stack of atomically thin monolayers of two lattice-mismatched semiconductors (Xufan Li et al, 'Two-dimensional GaSe/MoSe2 ...
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Gallium Arsenide on V-Groove Silicon Template for Photonics and Electronics
Apr 15, 2016Researchers in Hong Kong and USA have developed indium arsenide (InAs) quantum dot (QD) microdisk lasers directly integrated on silicon (Si) with performance comparable to the best reported for similar devices on gallium arsenide (GaAs) ...
Tags: InAs quantum dot microdisk lasers InAs GaAs substrates
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Indium Gallium Nitride Barriers Enhance LED Power And Efficiency
Mar 15, 2016South China University of Technology has shown improved power and efficiency performance for indium gallium nitride (InGaN) light-emitting diodes (LEDs) with 1.2% indium-content multiple-quantum-well (MQW) barriers [Zhiting Lin et al, J. ...
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Single-Crystal Gallium Arsenide on Quasi-Nominal Silicon
Dec 16, 2015Université Grenoble Alpes in France and Applied Materials in the USA have been developing techniques to grow gallium arsenide (GaAs) on silicon substrates with a small offcut angle [Y. Bogumilowicz et al, Appl. Phys. Lett., vol107, ...
Tags: GaAs, Quasi-Nominal Silicon, MOVPE
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Mitsubishi Uses Laytec in-Situ Monitoring to Grow Crack-Free GaN-on-Si HEMTs
Dec 3, 2015The main challenge of growing gallium nitride (GaN)-based high-electron-mobility transistors (HEMTs) on silicon substrates is the lattice mismatch between GaN and AlGaN that causes a high tensile stress and often leads to cracks. Now, by ...
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ASU Researchers Demonstrate White Lasers that Could Potentially Replace LEDs
Nov 12, 2015While lasers were invented in 1960 and are commonly used in many applications, one characteristic of the technology has proven unattainable. No one has been able to create a laser that beams white light. Researchers at Arizona State ...
Tags: ASU, White Lasers, LEDs
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Report: Silicon to Play Major Role in LED Production
Nov 5, 2015In a dramatic change from the status quo, nearly half of all gallium nitride (GaN) LEDs will be produced on silicon substrates by the end of the decade. That’s according to a new report by analysts at IHS, who forecast that the ...
Tags: LED Production, GaN LEDs, sapphire wafers
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Gallium Nitride Phosphide Absorber for Silicon-Based Solar Power
Oct 30, 2015Researchers in the USA have been working on gallium nitride phosphide (GaNP) as an absorbing material for solar power [S. Sukrittanon et al, Appl. Phys. Lett., vol107, p153901, 2015]. The aim of the team from University of California San ...
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KTH-Royal Institute Create Heterojunctions Consisting of N-InP and P-Type Silicon
Jun 16, 2015KTH-Royal Institute of Technology in Sweden has used corrugated epitaxial lateral overgrowth (CELOG) to create heterojunctions consisting of n-type indium phosphide (n-InP) and p-type silicon (p-Si) [Y. T. Sun et al, Appl. Phys. Lett., ...
Tags: corrugated epitaxial, silicon
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UCLA Developed Gallium Antimonide Thermophotovoltaic Cells
Apr 7, 2015University of California Los Angeles (UCLA) has developed gallium antimonide (GaSb) thermophotovoltaic (TPV) cells on gallium arsenide (GaAs) substrates [Bor-Chau Juang et al, Appl. Phys. Lett., vol106, p111101, 2015]. The use of GaAs ...
Tags: TPV devices, lattice mismatch, Electronics