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Tandem Organic Photovoltaics Brian E. Lassiter

Tandem Organic Photovoltaics Brian E. Lassiter. Organic Photovoltaics. The promise of OPV Materials design Low-temperature processing Lightweight, low-cost materials Roll-to-roll fabrication. 7/12/2012. PARC Talk. 2. Path to Commercialization. Efficiency Lifetime Low-cost fabrication.

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Tandem Organic Photovoltaics Brian E. Lassiter

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  1. Tandem Organic PhotovoltaicsBrian E. Lassiter

  2. Organic Photovoltaics The promise of OPV • Materials design • Low-temperature processing • Lightweight, low-cost materials • Roll-to-roll fabrication 7/12/2012 PARC Talk 2

  3. Path to Commercialization • Efficiency • Lifetime • Low-cost fabrication 7/12/2012 PARC Talk 3

  4. State of the Art 7/12/2012 PARC Talk 4

  5. Tandem • Advantages • Increased absorption length • Decrease thermalization losses • Design requirements • Current must be matched in the subcells optical model Metal Back sub-cell Interlayer Front sub-cell ITO Glass 7/12/2012 PARC Talk 5

  6. Literature 6.1% 5.2% 7/12/2012 PARC Talk 6

  7. Active Materials DPSQ SubPc 7/12/2012 PARC Talk 7

  8. Device Structure Ag BCP C70 SubPc:C70 MoO3 Ag PTCBI C70 DPSQ MoO3 ITO Glass 7/12/2012 PARC Talk 8

  9. Optical Modeling SubPc:C70 DPSQ PTCBI MoO3 MoO3 BCP C70 C70 7/12/2012 PARC Talk 9

  10. Single-cell devices Ag Ag MoO3 30 nm BCP 7 nm Ag 0.1 nm C70 3 nm PTCBI 5 nm SubPc:C70 29 nm C70 10 nm MoO35nm 13.1 nm DPSQ ITO Glass MoO3 20.5 nm ITO Glass 7/12/2012 PARC Talk 10

  11. Modeling Device Characteristics 7/12/2012 PARC Talk 11

  12. Optimization Ag BCP 7 nm C70 3 nm SubPc:C70 Y nm MoO3 5 nm Ag 0.1 nm PTCBI 5 nm C70 X nm DPSQ 13 nm MoO3 20 nm ITO Glass 7/12/2012 PARC Talk 12

  13. Device Characteristics Ag BCP 7 nm C70 3 nm SubPc:C70 29 nm MoO3 5 nm Ag 0.1 nm PTCBI 5 nm C70 10 nm DPSQ 13 nm MoO3 20 nm ITO Glass 7/12/2012 PARC Talk 13

  14. Quantum Efficiency 7/12/2012 PARC Talk 14

  15. Device Performance 7/12/2012 PARC Talk 15

  16. Summary • Developed a model to predict tandem J-V characteristics • Utilized solvent vapor annealing to increase DPSQ exciton diffusion length by ~100% • Incorporated C70, increasing JSC by >30% for each sub-cell • Fabricated a tandem device with ηP = 6.6% 7/12/2012 PARC Talk 16

  17. Acknowledgements Optoelectronic Components and Materials Group Supported in part by AFOSR, DOE Sunshot Program, MKE Korea, and Global Photonic Energy Corp. 7/12/2012 PARC Talk 17

  18. 7/12/2012 PARC Talk 18

  19. 7/12/2012 PARC Talk 19

  20. Solvent Annealing of DPSQ/C60 cells DPSQ • Improved bulk crystallinity excitondiffusion (JSC) • Crystalline interfaces polaron recombination (VOC) • Optimum bilayer device: Crystalline bulk and disordered D-A interface DPSQ C60 PTCBI Ag MoO3 ITO 7/12/2012 PARC Talk

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