20 Jun '11, 7am

Alta to Disclose the Science in Getting to 28.2% Single Junction Efficiency: Alta Devices is a well-funded sol...

Alta to Disclose the Science in Getting to 28.2% Single Junction Efficiency: Alta Devices is a well-funded sol...

Alta will disclose details of how it achieved record cell efficiencies of 27.6 percent late last year, as well as its best result to date of 28.2 percent -- both results have been verified by NREL. The theoretical maximum solar cell efficiency limit for a single junction device has been shown to be 33.5 percent (called the “Shockley-Queisser Limit”), but efforts to attain this efficiency have been slow in coming. “Up until now it was understood that to increase the current from our best solar materials, we had to find ways to get the material to absorb more light,” said Alta co-founder Eli Yablonovitch of UCB . “But, the voltage is a different story. It was not recognized that to maximize the voltage, we needed the material to generate more photons inside the solar cell. Counter-intuitively, efficient light emission is the key for these high efficiencies.” The Alta paper b...

Full article: http://www.greentechmedia.com/articles/read/alta-disclose...

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