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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
Efficiency Improvement• REF (traditional) vs SE (SE Solar Cells) – 0.5% + improvement (ABS)
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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)
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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)
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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
Copyright 2013 Ohl Energy. Ohl Energy is a Registered Trademark in USA, Australia and EU
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