Cubic silicon carbide could be twice as good as silicon for solar cells
June 22, 2012 // Julien Happich
According to Swedish researchers at the Linköping University, cubic silicon carbide may be capable of collecting more than twice the solar energy than silicon based solar cells.
The cubic silicon carbide is considered a perfect material for impurity (intermediate bandgap) solar cell. For boron doped cubic SiC, the dopant band of B in the bandgap of 3CSiC leads to an efficient use of sun light so that an efficiency up to 4860% could be achieved depending on theoretical models. But so far, cubic silicon carbide has shown to be the black sheep of the silicon carbide family, explains Mikael Syvjrvi, associate professor at the Linkping University. While hexagonal silicon carbide types have been commercialized for many years, cubic silicon carbide has faced too many challenges, such as being metastable, meaning that it does not really want to form. One has to decrease the growth temperature to make it form, but at the same time the growth rate is decreased. A common approach is to use silicon as a substrate, but the lattice and thermal mismatch causes defects and stress.
The Swedish researchers have applied a bulk growth approach like used in production of hexagonal silicon carbide. According to Syvjrvi, the trick is to lower the growth temperature while adjusting other parameters to maintain a high growth rate, at 1mm/hour. The group applies hexagonal silicon carbide as substrate, and the material is transformed to the cubic structure during initial stage of growth. The advantage of using hexagonal substrate is the perfect matching. Structural measurements have showed a similar quality like in hexagonal commercial material. The key parameter in showing off the quality is the carrier lifetime. Previously this had a lifetime of about 0.1 s, while the new record value is 8.2s in asgrown material, an increase of almost two orders of magnitude. In comparison, this is even slightly better than that in hexagonal silicon carbide.All news
Low noise rail-to-rail negative regulator with programmable current limit
August 28, 2014
The LTR3090 is a low noise single resistor programmable negative regulator based upon current reference architecture.
Study: Connected Car to spur competition between OEMs and IT players
BAE Systems develops 'smart skin' for aircraft
White-chip scale packages cut costs by 80 percent
Emberlight connects ordinary light bulbs to your smartphone
Cree targets mid-power LEDs with USD83m Lextar investment
August 27, 2014
Cree, Inc. has entered into an agreement with Lextar Electronics Corp., a vertically-integrated LED company from Taiwan, ...
Will 2D semiconductors threaten graphene's PV dominance?
IKEA GreenTech invests in energy-efficient LED technology developer
Searching through big data with the NSA
- How to Protect & Monetize Android Apps
- Building Blocks for the Internet of Things
- New Linear Regulators Solve Old Problems
- Testing GPS with a Simulator
InterviewCEO interview: Tronics' Langlois makes moves in MEMS
Pascal Langlois has been CEO at Tronics for nine months. He discusses plans for the company and directions for the complex and diverse MEMS technology sector.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Altium Ltd is offering EETimes Europe's readers the chance to win one TASKING VX-Toolset for ARM Cortex-M Premium Edition, normally licensed for 2.395 Euros, for ultra-rapid prototyping and code development around ARM Cortex-M based microcontrollers.
The VX-toolset for ARM is the first TASKING compiler suite to receive the Software Platform technology, which is seamlessly...Read more
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.