24 Indium: Claim of scarcity is scaremongering


Rumours are circulating that reserves of indium could soon run out, threatening production. But if you look at the evidence, you’ll fi nd that there is plenty of indium to go round for many decades to come.


26 CPV set for a brighter future It is diffi cult to gauge the state of the CPV industry:


System manufacturers have folded and scaled back, while Soitec has announced big plans. Although life can be tough in the CPV industry, an analyst is tipping the sector to grow at a healthy rate.


30 GaN for greater military service The US Department of Defense views GaN MMICs as


too expensive and insuffi ciently reliable for its needs. To address these shortcomings, it is spearheading a project to drive down cycle times, increase yield and improve reliability.


36 Uniting silicon and InP to make


versatile, low-cost chips Telecom and datacom networks are under ever- increasing strain from an explosion in data transfer. What’s the long-term solution? It’s a universal photonics technology that marries InP performance with large silicon wafers.


41 Driving SiC switches


Engineers can build motor drives and power supplies that deliver very high levels of effi ciency by combining frugal, fast SiC Super Junction Transistors with optimised gate drivers.


46 A unifi ed theory for LED droop What causes droop, the decline in an LED’s effi ciency


as the current passing through it is cranked up? Is it Auger recombination, or could it be carrier leakage? Both camps are dismissive but maybe they shouldn’t be.


50 Germanium virtual substrates:


promising for multi-junction cells Cutting cell costs will ensure that CPV become more competitive. One way to do this is to turn to silicon substrates incorporating germanium-based layers, which bridge lattice constants and allow the formation of a 1 eV junction for boosting effi ciency.


Magazine & Front Cover: Designed by Mitch Gaynor


news analysis 18 Amonix: the future of concentrating PV after all? 20 CMOS poised for power amplifi er takeover 22 All change for silicon carbide 23 SiC-on-silicon edges closer to LEDs


research review 57 Semi-polar plane delivers stable green LEDs 58 Building bigger GaN ICs 59 Is Auger defi nitely the cause of droop? 60 Flaws exposed in ZnO Hall measurements


news review: 06 Sharp’s III-V 44.4% effi cient solar cell raises the bar 07 Air Liquide acquire Voltaix 08 GaN LED shipments to top 100 billion units in 2013 10 In-Situ monitoring speeds up InP nanowire production 11 SemiLEDs expands vertical UV- LED portfolio 12 Sematech optimises device to enable III-Vs on silicon 14 Europium and magnesium co-doping creates powerful red GaN LEDs 15 Cree CXA LEDs set new benchmark


50


Volume 19 Issue 4 2013


Versatile, low-cost photonic chips


Indium


Scarcity claims are scaremongering


CPV industry’s bright future


@compoundsemi


www.compoundsemiconductor.net


Selecting the right SiC transistor


Maturing GaN for the US military


A unified theory for LED droop


News Review, News Analysis, Features, Research Review and much more. Free Weekly E News round up , go to www.compoundsemiconductor.net


July 2013 www.compoundsemiconductor.net 5


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