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Imec and Crystal Solar Demonstrate 22.5 Percent nPERT Si Solar Cells on Kerfless Epitaxial Wafers - Crystal Solar’s kerfless wafers are a disruptive solution for the solar cell industry, substantially reducing the cost of Si solar cells - XtalSolar.com / imec.be
Imec and Crystal Solar Demonstrate 22.5 Percent nPERT Si Solar Cells on Kerfless Epitaxial Wafers

 

PRZOOM - /newswire/ - Leuven, Belgium, 2016/04/14 - Crystal Solar’s kerfless wafers are a disruptive solution for the solar cell industry, substantially reducing the cost of Si solar cells - XtalSolar.com / imec.be.

   
 
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World-leading nanoelectronics research center imec and Crystal Solar, a pioneer in direct wafer growing technologies for the next generation of solar photovoltaic products, today announced that they have achieved a 22.5 percent cell efficiency (certified by FhG ISE CalLab) with nPERT silicon (Si) solar cells manufactured on 6-inch mono-crystalline epitaxially grown kerfless wafers. Marking an industry first, imec and Crystal Solar have demonstrated the highest efficiency to-date for homojunction solar cells on epitaxially grown silicon wafers, paving the way toward industrialization of this promising technology.

Crystal Solar’s breakthrough manufacturing technology called Direct Gas to WaferTM enables direct conversion of feedstock gas to mono crystalline silicon wafers by high throughput epitaxial growth. By skipping the polysilicon, ingoting and the wire-sawing steps altogether, this approach not only results in lowest cost/watt for the wafers but also significantly reduces the capital required to set up a manufacturing plant. Furthermore, this process enables the growth of high quality p-n junctions in-situ which reduces cell making steps while increasing the efficiency.

Imec has adapted its highly efficient nPERT Si solar cell process to align with the properties of Crystal Solar’s kerfless wafers. The 156x156mm2 cells were fabricated on 160 to 180 um thick grown n-type wafers with built-in rear p+ emitter. Imec’s n-PERT process included a selective front surface field realized by laser doping, advanced emitter surface passivation by Al2O3 and Ni/Cu plated contacts. The novel process using all industrially available processing steps resulted in record efficiencies for homojunction large area solar cells of 22.5 percent and a record Voc of 700mV. This high Voc illustrates the high quality of the wafers and the built-in junction.

Jozef Szlufcik, PV Department Director at imec: “We are extremely happy to have achieved such high conversion efficiencies on nPERT solar cells processed from kerfless wafers using imec’s pre-pilot industrial silicon PV manufacturing line. The combination of our advanced cell process and the innovative wafer manufacturing technique of Crystal Solar, is paving the way for manufacturing of highly efficient solar cells at substantially lower cost and will be disruptive for the complete solar manufacturing value chain.”

“We are pleased to see such a high conversion efficiency on our epitaxially grown n-type wafers with built in boron doped junctions”, said T.S. Ravi, CEO of Crystal Solar. “This approach represents a new paradigm in cell manufacturing with its unique ability to bypass significant steps in both wafer and cell manufacturing thereby dramatically reducing the capex and the overall cost per watt. We expect to achieve >23% efficiencies with imec’s PERT technology in the very near future”, Mr. Ravi concluded.

About Crystal Solar
Crystal Solar (xtalsolar.com) is a pioneer in the manufacturing of direct mono crystalline wafers using high throughput epitaxy. Funded by elite strategic and venture capital investors, Crystal is currently qualifying the wafers manufactured in its pilot line in Santa Clara, CA with multiple cell manufactures. Over the years, Crystal Solar has been awarded numerous DOE grants and its patented high throughput epitaxial reactor won the prestigious R&D 100 award in 2014.

About imec
Imec (imec.be) performs world-leading research in nanoelectronics and photovoltaics. Imec leverages its scientific knowledge with the innovative power of its global partnerships in ICT, healthcare and energy. Imec delivers industry-relevant technology solutions. In a unique high-tech environment, its international top talent is committed to providing the building blocks for a better life in a sustainable society. Imec is headquartered in Leuven, Belgium, and has offices in Belgium, the Netherlands, Taiwan, USA, China, India and Japan. Its staff of about 2,200 people includes almost 700 industrial residents and guest researchers. In 2014, imec's revenue (P&L) totaled 363 million euro.

Imec is a registered trademark for the activities of IMEC International (a legal entity set up under Belgian law as a "stichting van openbaar nut”), imec Belgium (IMEC vzw supported by the Flemish Government), imec the Netherlands (Stichting IMEC Nederland, part of Holst Centre which is supported by the Dutch Government), imec Taiwan (IMEC Taiwan Co.)and imec China (IMEC Microelectronics (Shanghai) Co. Ltd.) and imec India (Imec India Private Limited).

Crystal Solar Contact: T.S. Ravi, President and CEO, T: +1 408-490-1359 - E: tsravi[.]xtalsolar.com.

 
 
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Imec and Crystal Solar Demonstrate 22.5 Percent nPERT Si Solar Cells on Kerfless Epitaxial Wafers

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Crystal Solar | Imec
Contact: Hanne Degans - imec.be 
+32 16 28 17 69 / +32 486 06 51 75 (mobile) hanne.degans[.]imec.be
 
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