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JDSU 6” Wafer CPV Cells

JDSU 6” Wafer CPV Cells . Jan-Gustav Werthen 1 st CPV China & 4 th International CPV Workshop September 17 – 18, 2012. Outline. The value of MQW for CPV Theory & Modeling JDSU 42% MQW Cells Qualified production cells Performance Roadmap Summary.

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JDSU 6” Wafer CPV Cells

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  1. JDSU 6” Wafer CPV Cells Jan-Gustav Werthen 1st CPV China & 4th International CPV Workshop September 17 – 18, 2012

  2. Outline • The value of MQW for CPV • Theory & Modeling • JDSU 42% MQW Cells • Qualified production cells • Performance Roadmap • Summary

  3. There are no ternary alloys lattice matched to Ge or GaAs with a lower bandgap than GaAs The Value of Multiple Quantum Wells (MQW) The GaInP and GaAs bandgaps in a tandem/triple junction are too high. InGaP/GaAs

  4. GaAs Band Gap not ideal In0.1GaAs GaAs 1000 Suns J. Ward et al, 23rd IEEE PVSC, 650-654 (1993) • GaAs bandgap energetically too high • InGaAs better suited for AM1.5 spectrum under concentration

  5. Lattice Mismatch in Bulk InGaAs Leads to Dislocations Dislocations

  6. Stress Balancing Avoids the Creation of Dislocations GaAsP (barrier) We are able to grow up to 65 quantum wells with this technique InGaAs (well) GaAs (bulk) ‘Strain balanced’ quantum well solar cells are dislocation free EF

  7. Generation and Recombination with MQWs in Cell Junction Thermal escape Generation Thermal escape At short circuit current all generated carriers escape from the wells GaAsP GaAs InGaAs Shockley Injection Recombination Δμ Recombination n p i

  8. MQW Cell Spectral Response: Modeling and Experiment

  9. JDSU Production MQW CPV Cells: Spectral Response

  10. Typical Performance Parameters Production MQW Cells

  11. Highest Performing Production MQW Cells High-Efficiency Cell (9.3mm x 9.3mm)

  12. Distribution (Efficiency and Current at max power) Data shown for 9.3mm x 9.3mm cells

  13. Temperature Coefficients

  14. MQW Cell Platform Fully Qualified

  15. MQW Cell Performance Roadmap 2012 41%* 2013 41.5% 2014 42% 2015 43% 6 inch wafer AlInGaP MQW MQW InGaP AlGaAs MQW MQW MQW Ga(In)As Ge Ge Ge Ge *Minimum average efficiency from the first available production cells This roadmap contains forward-looking product development plans based on current expectations. The actual products, product functionality, and timing of the product and or product functionality releases could change materially.

  16. Summary • MQW CPV Cells Perform as Expected • Median cell efficiency at 41.5% per wafer • JDSU MQW Cell Platform Established • Qualified production cells on 150mm (6”) wafers • Roadmap Expands the Use of MQWs • Add MQWs to top cell to reach 43% per wafer • Acknowledgements to the JDSU engineering team: • Ben Browne, Jon Lacey, James Liu, Xiaodong Chen, Ta-Chung Wu, Gianluca Bacchin, Tom Tibbits

  17. Thank Youjan-gustav.werthen@jdsu.com

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