When and how did Amonix transition to multijunction technology?

The PV energy industry has long sought to overcome the efficiency limits of silicon solar cells, which become very inefficient when exposed to concentrated sunlight’s extreme conditions.

In 1989, the Electric Power Research Institute (EPRI), the research arm for several hundred domestic utility companies, approached Amonix to solve the solar cell stabilization problem. Using the company’s extensive semiconductor background, Amonix successfully stabilized a silicon solar cell under concentration. Further efforts led to the development of the Amonix back-junction point-contact silicon solar cell, which was the cornerstone of the Amonix CPV systems for many years. In 2005, Amonix produced the world’s most efficient silicon solar cell (27.6% efficiency under concentration), and manufactured it in a commercial environment – an industry first.

After years of silicon solar cell successes and many generations of Amonix CPV systems, Amonix began its transition to use multijunction solar cells. Originally developed for use in the harsh conditions of space environment, Amonix began testing multijunction solar cells on-sun in 2000 when the company received research contracts to adapt multijunction cells for terrestrial use with concentrated photovoltaic systems. Today, multijunction solar cells today exceed 40% efficiency in terrestrial applications – the industry’s highest efficiency.  By replacing silicon solar cells with multijunction cells, Amonix CPV systems now achieve maximum energy output.

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