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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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Presentation Transcript
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 sub-cell

Interlayer

Front sub-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

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

slide18

7/12/2012

PARC Talk

18

slide19

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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