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Technical Insights


Monday 12th March 2007
Philips Lumileds has combined its thin-film structure with a flip-chip design. The result, say Oleg Shchekin and Decai Sun, is a highly efficient device for lighting applications that delivers a better performance than vertically injected LEDs.
Monday 12th March 2007
Richard Stevenson quizzes Sudhakar Raman, Veeco's vice-president of marketing for MOCVD operations, about the introduction of the company's K300 and K465 "future-proof" reactors for GaN LED production.
Monday 12th March 2007
Finally, tunable lasers are the way they are meant to be – smaller, faster, power-efficient and reliable, says Syntune's Kevin Green. This is accomplished with designs based on conventional lasers, an approach that has produced the first monolithic 10 Gbit/s tunable transmitter for optical networks.
Monday 12th March 2007
France's Alcatel-Thales III-V Lab has built InAs quantum-dash lasers on InP substrates that share the attributes of quantum-dot lasers, but are easier to fabricate. Béatrice Dagens, François Lelarge, Alain Accard and Guang-Hua Duan explain their use in next-generation optical networks.
Monday 12th March 2007
Calculations unveil two problems with the Auger theory for LED droop. This recombination mechanism is far too weak, and it has a temperature dependence that fails to tally with experimental results
Monday 12th February 2007
Many MMIC and RFIC designers are still using primitive modeling techniques that ignore image noise and non-linear effects. Because these omissions can postpone product launches and hit sales, argues Chris Paris, designers should use dedicated software that can expose circuits' weaknesses.
Monday 12th February 2007
Jerry Zimmer, Gerry Chandler and Dwain Aidala from sp3 Diamond Technologies describe how silicon-on-diamond substrates are able to reduce the cost of GaN HEMTs and improve their reliability and output power.
Sunday 31st December 2006
A widespread move among manufacturers of LEDs to prepare for the next big wave of applications means that the order books of Veeco Instruments and Aixtron are bulging, and prospects look set to improve.
Sunday 31st December 2006
Quizzing the Air Force Research Laboratory's Laura Rea about the US military's technology roadmap, Bob Metzger hears how a dramatic shift in strategic thinking will affect the role of compound semiconductors.
Sunday 31st December 2006
Markus Pristovsek from the Technical University of Berlin describes his team's modifications to an STM instrument that have led to the first in situ images within an MOCVD reactor.
Sunday 31st December 2006
If we are going to harness the true extent of the Sun's energy, multi-junction solar cells are one option. But as Jon Cartwright reports, we could do it with multi-band cells – a new technology that RSL Energy promises will deliver the power conversion efficiency of triple-junction GaAs-based photovoltaics at the same price as single-junction devices.
Sunday 31st December 2006
Ineffective current blocking layers cause an efficacy drop in LEDs at high drive currents, say Ioffe Institute researchers Igor Rozhansky and Dmitry Zakheim. They believe that this can be overcome by switching to an n-p-n structure, as Richard Stevenson reports.
Sunday 31st December 2006
A government-sponsored Japanese program has built a range of high-power GaN transistors that are set to benefit mobile phone networks and automotive radar systems. Richard Stevenson investigates.
Sunday 31st December 2006
Oliver Ambacher and Gabriel Kittler from the Technical University of Ilmenau describe how a European consortium is building a medical analysis tool from GaN devices for use in hospitals and laboratories.
Monday 27th November 2006
BluGlass's low-cost GaN deposition method has already won favor among Australian investors. Jon Cartwright catches up with CEO David Jordan to find out what direction the company is headed for next.
Monday 27th November 2006
Markus Ortsiefer from Vertilas explains why long-wavelength tunable VCSELs are a better option for gas sensing than the lead salt, quantum cascade and diode-pumped solid-state lasers that are used today.
Monday 27th November 2006
The hybrid III-V/silicon laser manufactured by Intel and its collaborators may not represent true silicon photonics, but it is a significant development in optical interconnects for chip and board communications, discovers Michael Hatcher.
Monday 27th November 2006
Competition among SiC substrate manufacturers has boosted wafer diameters and eliminated micropipe defects in commercial SiC wafers. However, there is still some division over the effectiveness of the standards used to define the quality of the material, as Richard Stevenson discovers.
Monday 27th November 2006
Commercial applications and market penetration of devices dominated the recent ECSCRM conference in Gateshead, UK, which was held on the centenary of the first SiC paper. Alton Horsfall reports.
Monday 27th November 2006
A Californian start-up claims that its ultrapure steam generator can boost the production yield and speed the oxide aperture process used widely in VCSEL manufacturing. Richard Stevenson talks to the tool's inventor, Jeff Spiegelman.
Friday 27th October 2006
The global move towards greater energy-efficiency is one that Cree can tap into from many angles as it looks beyond its traditional territory of blue LEDs. Bob Metzger visited the company's new North Carolina fab to learn more about its latest strategy for growth.
Friday 27th October 2006
Rob Hershey from the Texan company Molecular Imprints explains how a simple and low-cost whole-wafer imprinting technique can increase the extraction efficiency of LED chips.
Friday 27th October 2006
Jon Cartwright talks to three US chip makers who are battling it out to provide the best light source for large screen rear-projection televisions.
Friday 27th October 2006
TopGaN's pressure-grown GaN platelet and needle crystals have record-breaking low defect densities, but are limited in size. However, they can be extended by a high growth rate hydride vapor phase epitaxy process that does not compromise on quality, says the company's vice-president Izabella Grzegory.

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