CONNECTING THE COMPOUND SEMICONDUCTOR COMMUNITY
November / December 2010 Volume 16 Number 8
Editor-in-Chief David Ridsdale
+44 (0)1923 690210
Consultant Editor Richard Stevenson PhD
richardstevenson@angelbc.co.uk
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News Editor
Dr.Su Westwater
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Director of SOLAR & IC Publishing Jackie Cannon
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Account Managers Shehzad Munshi
+44 (0)1923 690215 Tommy Beazley
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USA Representatives Brun Media Tom Brun
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Janice Jenkins E:
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Director of Logistics Sharon Cowley
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Design & Production Manager Mitchell Gaynor
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Circulation Director Jan Smoothy
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Subscriptions Manager Debbie Higham
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Chief Operating Officer Stephen Whitehurst
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Directors
Bill Dunlop Uprichard – CEO Stephen Whitehurst – COO Jan Smoothy – CFO Haroon Malik, Jackie Cannon, Scott Adams, Sharon Cowley, Sukhi Bhadal
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Compound Semiconductor is published eight times a year on a controlled circulation basis. Non-qualifying individuals can subscribe at: £105.00/€158 pa (UK & Europe), £138.00 pa (air mail), $198 pa (USA). Cover price £4.50. All information herein is believed to be correct at time of going to press. The publisher does not accept responsibility for any errors and
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Despite my interest in new technology I’m anything but an early adopter. I prefer my music played through a well-engineered turntable, I have an ageing mobile that’s rarely got enough juice to take a call and my TV sports a cathode ray tube.
But a few weeks ago I decided to invest in the lighting of the future, the LED-based light bulb. What’s it like? Well, in a word, fantastic. It sends out a beautiful warm white light that puts the fluorescent bulbs in the house to shame and it needs just 8W to pump out enough lumens to be considered the equal of an 40 W incandesecent bulb.
So am I on the verge of replacing all the light bulbs in the house with LED-based ones? No. Although that would mean that I’d never have to shop for light bulbs for another 15 years, this exercise would set me back a £1000!
Instead, I’ll bide my time while the LED industry continues to chip away at the cost per lumen. The attack will come on two fronts: reducing the amount it costs to make an LED; and increasing the amount of light this chip produces.
In this issue, two features offer entirely different takes on how to pull the first of those levers.
A piece from Aixtron describes a holistic approach to doubling throughput of multi-wafer MOCVD reactors. It’s no surprise that turning to bigger wafers delivers part of this gain, but there are also improvements associated with substantially reducing the ‘down time’ thanks to the introduction of a new ceiling plate.
A far more radical way to slash chip costs is to dispense with GaN and turn to a cheaper material. ZnO could fit the bill because it combines low cost with the promise of efficient emission and widespread availability of its constituents.
Today ZnO LEDs are confined to the lab, but they will be in the fab by the middle of this decade, according to the market analyst Nanomarkets. The key question is how well they will sell. My guess is that in ten years time my house, along with many of yours, will be lit by GaN-based LEDs. But maybe I’ll have bought one ZnO version, just to see how it stacks up.
Richard Stevenson PhD Consultant Editor
E:
tbrun@brunmedia.com
sm@angelbcl.co.uk tb@angelbcl.co.uk
The LEDs ultimate application
jc@angelbcl.co.uk dr@angelbcl.co.uk
editorialview
November / December 2010
www.compoundsemiconductor.net 3
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