ohl energy - technical advances in solar cell and solar panel manufacturing

Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and UE

Technical Advantage & TechnologyR&D Focus and upcoming enhancements

Ohl Energy ® Technology Overview

• High Efficiency. Focus on enhancing / new technologies• Continuous R&D Focus, 2 New Projects• Integrated Production (allowing know-how)• All existing and new technologies

suitable for Home, Industrial, Utility (Large Scale) Power generation Projects

• Current Top Model (Mono) Cell Efficiency reached 18.1%, Planned 18.7% efficiency in 2013

• Production Capacity exceeding 150MW / Year, Planned 250MW in 2013.

Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU

Ohl Energy ® R&D

• Solar Cell Technology

• Screen Printable Selective Emitter Solar Cell technology

• Solar Call with Passivated rear-surface local contact

• Quantum Dot Contact Cells


SE Cells vs HE Cells

• Homogenous Emitter (HE) vs. Selective Emitter (SE)

HE: Traditional C SI‐solar cellsHomogeneous PN junctionformed by a traditionalPOCl3 diffusion.

SE: PN junctionformed by a special process.N++ Layer - heavy doping, lower sheet resistance,under "silver fingers" N Layer: Light doping, higher sheet resistance, between silver fingers


Ohl Energy ® Technology

• Cells Process sequence, P-Ink, some characteristics

• Advantages of SE:

• Higher FF – Lower contact resistance, better junction quality

• Higehr Jsc – Higher blue response

• Higher Voc – Lower Surface recombinging & lateral P-N junction


P-Ink use and Characteristics

P-Ink Physical Characteriscs

• – Thick, transparent liquid with density close to water

• Chemical Propertiees

• – Non-flammable, non-explosive, non volatile compound

• - Low corrosiveness, low toxicity


P-Ink SE Process Sequence• P-Ink SE - Additional process of printing and baking of P-Ink

Texturing E.Iso & PSG.R ARC Rear

PrintingFront

Printing Co-Firing

TexturingInk (printing

and diffusion)

E.Iso & PSG.R ARC Rear

PrintingFront

Printing Co-Firing

Traditional HE

SE Process


Efficiency Improvement• REF (traditional) vs SE (SE Solar Cells) – 0.5% + improvement (ABS)


SE R&D Results

• SE Cells are currently planned for mass production

• The conversion efficiency has reached 18.6% to 19.2%.

• Production lines ready

• Production facility is investing $3M over two years for R&D and Facility and process improvement


Rear-Surface Local Contact (Cells)

• Ongoing R&D with significant results

• Conversion Efficiency (Mono Cells) by 1-2% (conversion efficiency 20-21%)

• Ongoing research still – no production results yet


Traditional vs. PRLC Cells

• Traditional Solar Cell with full Al rear surface Contact

• PRLC Solar Cell with passivated rear-surface and local contact

Dielectric layer formation (researched method)


PRLC Cells – Breakthrough Advantages

Lower Rear Surface

recombination velocity

Higher Open Circuit Voltage

Stronger IR Reflection at back inter-

surface

Higher short-circuit current

Lower Stress from Back

Surface metalisation

Lower Bow suit to thinner silicon wafer

Dielectric layer formation (researched method)


Quantum Dot – Future R&D 2013+

• Pilot Production September 2012

Relationships with Teaching and Research Institutes in New Solar technologies

• New Safire Furnace – for testing purposes

• Capacity can go from 250MW/year to 500MW


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ohl energy - technical advances in solar cell and solar panel manufacturing

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