Four-junction, four-terminal solar cell reaches 43.9 percent efficiency
April 29, 2014 // Paul Buckley
Semprius, Inc., has manufactured the first four-junction, four-terminal stacked solar cell which is capable of achieving a efficiency level of 43.9 percent by using the company's proprietary micro transfer printing process.
To achieve the world-class efficiency perfomance Semprius collaborated with Professor John Rogers and his team at the Frederick Seitz Materials Research Laboratory at the University of Illinois art Urbana-Champaign and researchers at Solar Junction , a leading III-V high-efficiency solar cell manufacturer and important Semprius partner.
Initial trials yielded solar cells with measured efficiencies up to 43.9 percent. The company claims the process is capable of achieving solar cell efficiencies greater than 50 percent in the near future.
The new stacked solar cell is comprised of a three-junction microcell that is stacked on top of a single-junction germanium microcell using Semprius’ high-speed micro transfer printing process, which enables the simultaneous formation of thousands of stacked microcells with high yields. By using four junctions, the stacked cell is able to capture light across a broader portion of the solar spectrum and therefore achieve efficiencies much higher than conventional silicon and thin-film single-junction solar cells.
A key achievement of the project was the development of a new interfacial material that is placed between the top and bottom cell to minimize optical losses within the stack and thereby optimize overall conversion efficiency. In addition, the new stacked cell has four terminals, rather than the standard two to reduce the spectral dependence of the solar cell and increase the solar cell’s energy yield under normal operation in the field.
In 2012, Semprius announced the first mass-produced photovoltaic module that exceeded 33 percent efficiency. In September 2013, Semprius increased this record to 35.5 percent, as confirmed by the Fraunhofer Institute for Solar Energy Systems ISE in Germany
Scott Burroughs, vice president of Technology at Semprius, said: “Because the process we used is fully compatible with our current production processes, we believe this demonstration can be easily transferred to manufacturing.”
Related articles and links:
Thin-film solar cell efficiency mystery is solved
Should the solar cell be pensioned off?
High-temperature plasmonics boost solar cell efficiency rates
Chip market for wireless sensor networks on 23% CAGR
November 27, 2014
The number of Internet connection will grow from 9 billion in 2014 to 100 billion devices by 2020, according to market research ...
Biometric credit card ready for mass production, says Card Tech
New class of layered materials drive PV innovations
Lauterbach, Symtavision intermesh software for better safety
Mouser launch design contest around NXP's dual PCB configurable logic
UHF could usher in 'super-Wi-Fi'
November 26, 2014
Today Wi-Fi is everywhere and even carriers are looking at what is called 'Carrier Wi-Fi' to offload data from their congested ...
Smart PCBs for smaller ECUs: Infineon invests in PCB manufacturer
FTTH solutions for MDUs
Tiny LED makes bionic contact lenses realistic
- Common Mode Rejection in Wide Input Range Op Amps
- Power Systems Design eBook
- Halogen-free options and increased performance for terminal blocks
- Wireless Power User Guide
InterviewCEO interview: Vicor powers after higher volume applications
Patrizio Vinciarelli, is one of the longest serving CEOs in electronics, having founded Vicor in 1981 and led the company ever since. At Electronica he told EE Times Europe that his company is investing ...
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, Cherry is giving away five of its Energy Harvesting Evaluation kits, worth over 266 Euros each, for EETimes Europe's readers to win. Cherry's energy harvesting technology benefit mostly applications where a complex wire assembly and/or batteries would be inappropriate.
The required RF-energy is created by the mechanical actuation of the switch and the data is transmitted...MORE INFO AND LAST MONTH' WINNERS...
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.