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Silicon solar cells show 23.3% efficiency

Posted: 08 Dec 2011 ?? ?Print Version ?Bookmark and Share

Keywords:interdigitated back-contact? silicon solar cell? float-zone?

Imec, along with its silicon photovoltaic industrial affiliation program partners Schott Solar, Total, Photovoltech, GDF-SUEZ, Solland Solar, Kaneka and Dow Corning, has revealed a conversion efficiency of 23.3 percent on interdigitated back-contact (IBC) silicon solar cells. According to them, the IBC will pave the way for thinner PV cells.

The IBC enables simplification of module fabrication and improves aesthetics of the final solar cell modules, Imec stated. It added that the technology decreases the cost of silicon solar cells beyond what is present in the market.

Key aspects of the 2 x 2cm2 IBC Si solar cells feature n-type base float-zone (FZ) silicon substrates, random pyramid texture, a boron diffused emitter and phosphorous diffused front- and back surface fields. They also have thermally grown silicon dioxide for surface passivation, SiN single layer anti-reflective coating, lithography-based patterning and aluminum metallization. The IBC cells are certified by ISE-Callabs (Jsc = 41.6mA, Voc = 696mV, FF = 80.4%).

"We are delighted to demonstrate these excellent efficiency results on IBC silicon solar cells. They prove the relevance of the IBC technology to our industrial partners. Such high efficiencies on small-area IBC silicon solar cells are a perfect base for further developing a large-area and industrially feasible IBC cell technology at Imec," commented Jef Poortmans, director of Imec's photovoltaic R&D program.

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