Interdigitated back-contact silicon solar cells above 23% efficiency

Dec 02, 2011
Interdigitated back-contact silicon solar cells above 23% efficiency
Caption: Interdigitated back-contact silicon solar cells above 23% efficiency

Imec together with its silicon photovoltaic industrial affiliation program partners Schott Solar, Total, Photovoltech, GDF-SUEZ, Solland Solar, Kaneka and Dow Corning, have demonstrated an excellent conversion efficiency of 23.3% on interdigitated back-contact (IBC) silicon solar cells.

Interdigitated back contacts are introduced to increase the of crystalline 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 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.”

”As silicon photovoltaic industrial affiliation program partners of imec we are very happy with this new result”, says Dr. Martin Heming, CEO of SCHOTT Solar. This German solar manufacturer was the first industry partner to join imec’s program on silicon . “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.”

Explore further: New technology reduces size of spinal stimulator implants

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

BlackBerry courts iPhone users with cash

2 hours ago

Canadian smartphone maker BlackBerry is wooing Apple customers with a cash offer for trade-ins of iPhones for its new square-screened, keyboard-equipped Passport.

HP earnings show continued struggle

3 hours ago

Venerable tech giant Hewlett-Packard has been struggling for three years to turn its business around. Its latest earnings show it still has more work ahead.

UN moves to strengthen digital privacy (Update)

4 hours ago

The United Nations on Tuesday adopted a resolution on protecting digital privacy that for the first time urged governments to offer redress to citizens targeted by mass surveillance.

Spotify turns up volume as losses fall

4 hours ago

The world's biggest music streaming service, Spotify, announced Tuesday its revenue grew by 74 percent in 2013 while net losses shrank by one third, in a year of spectacular expansion.

Are electric cars greener? Depends on where you live

4 hours ago

Long thought a thing of the future, electric cars are becoming mainstream. Sales in the United States of plug-in, electric vehicles nearly doubled last year. Credible forecasts see the number rising within ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Vendicar_Decarian
1 / 5 (1) Dec 02, 2011
cost?

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.