In a press release, Dow detailed the rollout of a new roofing product that incorporates solar cells in roofing shingles.
Dow says conventional roofing contractors will be able to intermix the shingles with conventional asphalt shingles and install both types simultaneously.The shingles will have an impact on the Zero Energy House, a project spearheaded by General Electric (GE) that I wrote about in July. Dow refers to these shingles as Building Integrated Photovoltaic (BIPV) building materials. They use high-efficiency (Dow's words), CIGS-based, thin film photovoltaic cells manufactured on a flexible substrate. The structure is laminated into the final shingle using conventional polymer processing methods. CIGS refers to a material composed of copper, indium and gallium selenide. The term selenide refers to selenium, which is forming intermetallic compounds with the other three metals. Dow has not revealed the source for its CIGS photovoltaic cells. They could be producing a material that they have developed and will manufacture themselves. They might also be sourcing them from a number of companies that have been developing products using CIGS. Among these companies are Nanosolar of San Jose, Calif.; Global Solar of Tucson, Ariz.; MiaSole of Santa Clara, Calif.; and HelioVolt of Austin, Texas. All are privately held. Only Global Solar claims to be in full-scale production of CIGS products, with manufacturing facilities in Tucson and Berlin, Germany. More than a year ago, IBM (IBM) announced a joint venture with privately held Tokyo Ohka Kogyo to develop CIGS technology that could be licensed to solar companies by 2010 or 2011. The stated objective was to produce solar cells with an electricity cost of less than $1 per watt at peak generation. This is a long-sought goal for solar technology. This cost goal would involve reaching 15% efficiency for photovoltaic cell operations. CIGS cells on the market today are in the area of 10% efficient. HelioVolt has announced a process that produces 12.2%-efficient cells using a new process, and Global Solar has said it expects to ultimately reach 14% efficiency. These efficiency goals are theoretically possible. In 2008 the U.S. National Renewable Energy Research Laboratory achieved an efficiency of 19.9% using the same general process technology that most commercial concerns are using (called co-evaporation).
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