eeTimes
eeTimes
eeTimes eeTimes eeTimes
Forgot password Register
Print - Send - -

Technology News

Imec's interdigitated back-contact silicon solar cells deliver an efficiency above 23 percent

December 02, 2011 | Paul Buckley | 222903785
A conversion efficiency of 23.3% on interdigitated back-contact (IBC) silicon solar cell has been demonstrated by Interuniversity Microelectronics Centre (Imec) working together with its silicon photovoltaic industrial affiliation program partners Schott Solar, Total, Photovoltech, GDF-SUEZ, Solland Solar, Kaneka and Dow Corning.

Interdigitated back contacts are introduced to increase the conversion efficiency of crystalline silicon solar cells and allow for further reduction of the cell thickness, simplification of module fabrication and improved aesthetics of the final solar cell modules. Imec has developed a high-efficiency baseline process for small-area IBC cells within its multi-partner silicon solar cells industrial affiliation program that aims at increasing the efficiency well above 20% and decreasing the cost of silicon solar cells beyond the current state-of-the-art.     

Key aspects of the newly developed small-area (2x2 cm2) IBC Si solar cells are the n-type base float-zone (FZ) silicon substrates, a random pyramid texture, a boron diffused emitter, phosphorous diffused front- and back surface fields, a thermally grown silicon dioxide for surface passivation, a SiN single layer anti-reflective coating, lithography based patterning and Aluminum metallization. The realized IBC cells achieve a designated area conversion efficiency of 23.3% (Jsc = 41.6 mA, Voc=696 mV, FF=80.4%), certified by ISE-Callabs.     

Jef Poortmans, director of imec's photovoltaic R&D program: “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.”     

Dr. Martin Heming, CEO of SCHOTT Solar, a German solar manufacturer that was the first industry partner to join imec's program on silicon solar cells, said: “The test result confirms our confidence in imec's excellent PV R&D capabilities and vision, and it allows us to acquire important know-how and IP as basis for our next generation solar cell products.”     

More about the IBC project at
http://www2.imec.be/be_en/press/imec-news/imecsolaribccell.html










Please login to post your comment - click here
Related News
MOST POPULAR NEWS
Interview
Technical papers
Poll
Do you find reference designs help speed your design cycle?