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: NTT Electronics ships industry's first 20nm low-power coherent DSP

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Microsoft to launch Xbox One in China in days

2 hours ago

US technology giant Microsoft will launch its Xbox One in China on September 29, becoming the first game console to enter the market in 14 years, it said Tuesday, in an apparent reversal of a delay announced ...

PlayStation TV to hit US in October

2 hours ago

PlayStation TV home entertainment system is set to hit North America on October 14 as Sony seeks to improve its financial footing with games, films and music.

A 3D-printed laptop prepared for crowdfunding campaign

4 hours ago

Using PLA filament, a small London-based team have managed to achieve the 3D printing of their own Raspberry-Pi-based laptop, with a battery life of six to eight hours and Wi-Fi enabled out of the box. They ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

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