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news digest ♦ Solar


Solar cell producers now have an easy alternative at hand. By sputtering a layer of sodium doped molybdenum, the amount of sodium in the absorber layer can precisely be controlled and reproduced.


Plansee offers MoNa sputtering targets with high purity and a uniform and fine grained microstructure. Tests in cooperation with the Swiss EMPA institute have already proven their benefits in practice. With sodium doped molybdenum layers the efficiency of CIGS solar cells could be significantly improved.


GreenVolts and ISD to provide solar solutions in California


The two firms will install complete and fully integrated III-V multi-junction solar cell systems for agricultural applications


GreenVolts has formed a strategic partnership with Independent Solar Developers (ISD), a turnkey solar system developer, owner, and operator.


ISD specialises in providing solar energy solutions for Southern California agricultural applications.


agricultural businesses require over 2,000 MW and use more than 10 TWh annually. These businesses have plenty of land and sun, ideal for solar energy, and are very interested in lowering their cost of electricity, which can exceed 20 percent of production costs.


GreenVolts and ISD have worked closely together to develop a solution that provides long term, economical electricity supply along with a unique set of land use, project planning, installation, and operational benefits tailored to this market. ISD can also provide financing, thereby overcoming the primary barrier for most projects. With its first project installed and operating successfully, and others in progress, GreenVolts is delivering tailored solutions for irrigation, cattle, food processing, and other agricultural applications.


“I cannot overemphasise the advantage that a complete system from one supplier with a single, overall, 20-year warranty presents to an owner who is considering solar energy,” said Peter Molloy, Principal, Independent Solar Developers. “GreenVolts is high performance, rugged, and an overall excellent fit for agricultural applications.”


GreenVolts’ CPV systems are based on III-V compound semiconductor multi-junction cell technology. This is the most efficient solar technology available for hot, sunny environments such as the Southwest U.S. agricultural areas. The modular design can be configured for distributed loads, such as irrigation pumps located on different parcels of land, or scaled up to meet higher demand, such as refrigeration in the processing of vegetables. ISIS, the energy management software included with the system, allows remote monitoring and management of all the systems from anywhere on the Internet.


Solar Panels at Belk Farms, California


Using solar energy for agriculture is a large and untapped opportunity. In California alone,


162 www.compoundsemiconductor.net January / February 2012


“ISD has established themselves as a total solution partner to their customers, going beyond just solar. They offer energy analysis, system audits that include usage and load patterns, financing, and operations


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