Tandem organic photovoltaics brian e lassiter
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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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Tandem organic photovoltaics brian e lassiter

Tandem Organic PhotovoltaicsBrian E. Lassiter


Organic photovoltaics

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

Path to Commercialization

  • Efficiency

  • Lifetime

  • Low-cost fabrication

7/12/2012

PARC Talk

3


State of the art

State of the Art

7/12/2012

PARC Talk

4


Tandem

Tandem

  • Advantages

  • Increased absorption length

  • Decrease thermalization losses

  • Design requirements

  • Current must be matched in the subcells optical model

Metal

Back Cell

Interlayer

Front Cell

ITO

Glass

7/12/2012

PARC Talk

5


Literature

Literature

6.1%

5.2%

7/12/2012

PARC Talk

6


Active materials

Active Materials

DPSQ

SubPc

7/12/2012

PARC Talk

7


Device structure

Device Structure

Ag

BCP

C70

SubPc:C70

MoO3

Ag

PTCBI

C70

DPSQ

MoO3

ITO

Glass

7/12/2012

PARC Talk

8


Optical modeling

Optical Modeling

SubPc:C70

DPSQ

PTCBI

MoO3

MoO3

BCP

C70

C70

7/12/2012

PARC Talk

9


Single cell devices

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


Modeling device characteristics

Modeling Device Characteristics

7/12/2012

PARC Talk

11


Optimization

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


Device characteristics

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


Quantum efficiency

Quantum Efficiency

7/12/2012

PARC Talk

14


Device performance

Device Performance

7/12/2012

PARC Talk

15


Summary

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


Acknowledgements

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


Tandem organic photovoltaics brian e lassiter

7/12/2012

PARC Talk

18


Tandem organic photovoltaics brian e lassiter

7/12/2012

PARC Talk

19


Solvent annealing of dpsq c 60 cells

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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