27 Replacing halogen lamps Inferior light quality holds back the sales of most LED-
based replacements for halogen lamps in casinos, hotels, high-end retailers and cruise ships. But that’s not the case for Soraa’s lighting products, which produce full-spectrum emission with a violet LED exciting red, green and blue phosphors.
30 Simplify air quality monitoring Conventional sensors for assessing the air quality in
buildings are wired into the mains, making them expensive to install and reposition. But portability and battery powering is possible with Gas Sensing Solutions’ modules that feature mid-infrared LEDs and photodetectors.
36 Building brighter, cheaper LEDs The gases and chemicals that are consumed during
the manufacturing of LEDs make a considerable contribution to device costs. But savings are possible by switching to a new MOCVD design with a flared chamber profile that not only trims gas consumption by up to 40 percent but also shortens the growth interruption between layers, leading to improved multiple quantum well quality.
44 Boosting triple-junction yield
with in-situ monitoring In-situ monitoring provides a great deal of valuable information for developers and producers of multi-junction solar cells. It can determine interface quality; the thickness, doping level and composition of every layer; and wafer bow.
48 Water-based strippers tread
lightly on the environment A novel, water-based stripper offers a fast, environmentally friendly approach to high quality removal of photoresist and the carrying out of metal lift-off.
53 An elemental change to
laser design Today’s telecom lasers are plagued with Auger-related losses, which drive down efficiency and make device cooling mandatory. The solution: Switch to an active region with alloys featuring a bismuth content of more than 10 percent.
news analysis 18 Eastern promise? 20 The rise and rise of Infinera 22 Sapphire substrates to lead future LED markets 24 Plessey thrusts LEDs into the market
research review 59 Better electron blocking boosts UV efficiency 60 Heavily doped silicon enables chemical lift off 61 Exposing anti-phase profiles in GaP-on-silicon
news 06 IHS: LED manufacturers to continue oversupplying 07 IQE qualifies its CPV epiwafers 08 Doped tungsten doubles lifetime in sapphire growth 10 Raw material global demand doubles as LED market booms 11 Alta Devices enables unmanned aircrafts to fly in the sun 12 Scientists make progress toward quantum dot solar cell 14 Saelig samples Plessey LEDs 15 Cree introduces $99 LED street light 16 GaN-on-silicon LEDs are catching incumbents 17 First Solar sells CdTe Canadian power plants
Volume 19 Issue 6 2013
Better electron blocking in UV LEDs
@compoundsemi
www.compoundsemiconductor.net
18
Bismuth promises ultra-cool lasers
In-situ monitoring aids cell growth
Full-colour lamps with violet LEDs
Strippers
Combining speed with green credentials
A third way for MOCVD design
August / September 2013
www.compoundsemiconductor.net 5 Magazine & Front Cover designed by Mitch Gaynor
News Review, News Analysis, Features, Research Review and much more. Free Weekly E News round up , go to
www.compoundsemiconductor.net
Front Cover CS
v3RS.indd 1 28/08/2013 15:47
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