1 / 38

Adding Interstitial Layers For Improved Open-Circuit Voltage in Organic Solar Cells

Adding Interstitial Layers For Improved Open-Circuit Voltage in Organic Solar Cells . Husna Anwar ’15 Arango Lab Leap Symposium 2013. SUNNY WITH A CHANCE OF POWER:. What’s the big deal?. CO2 levels are at 400 parts per million (ppm) in the atmosphere – . What’s the big deal?.

meghan
Download Presentation

Adding Interstitial Layers For Improved Open-Circuit Voltage in Organic Solar Cells

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Adding Interstitial Layers For Improved Open-Circuit Voltage in Organic Solar Cells Husna Anwar ’15 Arango Lab Leap Symposium 2013 SUNNY WITH A CHANCE OF POWER:

  2. What’s the big deal? • CO2 levels are at 400 parts per million (ppm) in the atmosphere –

  3. What’s the big deal? • - at 450 ppm temperatures will rise by 2 °C

  4. What’s the big deal? • Fossil Fuels are a finite resource

  5. What’s the big deal? • Fossil Fuels are a finite resource Alberta Tar Sands Image: National Geographic

  6. Why Organic Photovoltaics (PV) Silicon-based panels are bulky, expensive and difficult to produce and install. Image: Birmingham Mail Image: Birmingham Mail

  7. Why Organic Photovoltaics (PV) Silicon-based panels are bulky, expensive and difficult to produce and install. Image: Birmingham Mail Image: Birmingham Mail Organic PV is light-weight, flexible and can be produced in a matter of hours. Image:SoloPower Image: SoloPower Image: SoloPower

  8. Why Organic Photovoltaics (PV) Image: Global Solar

  9. Why Organic Photovoltaics (PV) Image: Global Solar Image: Global Solar Image: Global Solar Image: Global Solar

  10. Why Organic Photovoltaics (PV) Image: Global Solar Image: Global Solar Image: Global Solar Image: Global Solar Image: Global Solar

  11. The Donor/Acceptor Concept Donor Acceptor Image: Phoebe Tengdin

  12. The Donor/Acceptor Concept Donor Acceptor Image: Phoebe Tengdin

  13. The Donor/Acceptor Concept Photocurrent generation Electrons 1 Holes Image: Phoebe Tengdin

  14. Voltage and Current • Current is the flow of charge

  15. Voltage and Current • Current is the flow of charge • Voltage is what drives charge to flow

  16. Voltage and Current • Current is the flow of charge • Voltage is what drives charge to flow • Power depends on both current and voltageP=IV

  17. Issues with Organic PV • Low efficiency due to low open-circuit voltage (Voc)

  18. Issues with Organic Solar • Low efficiency due to low open-circuit voltage (Voc) • Vocis connected to interfacial bandgap

  19. Issues with Organic Solar • Low efficiency due to low open-circuit voltage (Voc) • Vocis connected to interfacial bandgap -3.0 eV LUMO -4.0 eV P3HT VOCdepends on interfacial bandgap PCBM HOMO -4.9 eV -6.5 eV

  20. Deposition methods • Spin-coating Spinning Materialdropped Substrate B C D A Image: Andrea Miranda

  21. Deposition methods • Vapor Deposition Coated substrate Substrate Material evaporates Material Thermal Evaporator(under vacuum) B C A Image: Sophia Weeks

  22. Deposition methods • Transfer Printing Glass PCBM spin-coated ITO PEDOT:PSS P3HT PCBM PDMS B C D A

  23. What we did • Vapor deposition of small molecule with a wide bandgap LUMO P3HT Charge recombination at the interface PCBM HOMO

  24. What we did • Vapor deposition of small molecule with a wide bandgap very thin interstitial layer of Alq3 -3.1 eV -3.0 eV LUMO -4.0 eV P3HT Alq3 PCBM HOMO -4.9 eV -5.7 eV -6.5 eV

  25. Results dark light

  26. Results Voc=0.27 V Jsc=0.013 mA

  27. Results Jsc=-0.011 mA Voc=0.27 V Voc=0.44 V Jsc=0.013 mA

  28. Issues • Very low short-circuit current (Jsc)

  29. Issues • Very low short-circuit current (Jsc) • Inconsistent device performance

  30. Issues • Very low short-circuit current (Jsc) • Inconsistent device performance PCBM film on a PDMS stamp

  31. Issues • Very low short-circuit current (Jsc) • Inconsistent device performance 68 nm -29 nm 10 nm 5 nm 5 nm 0 nm 0 nm Surface topography imaged through Atomic Force Microscopy (AFM) PCBM film on a PDMS stamp

  32. What we found out • Alternative energy is essential

  33. What we found out • Alternative energy is essential • Organic PV is a very viable solution

  34. What we found out • Alternative energy is essential • Organic PV is a very viable solution • Adding a small molecule almost doubled our Voc

  35. What we found out • Alternative energy is essential • Organic PV is a very viable solution • Adding a small molecule almost doubled our Voc • We need better Jsc and consistency

  36. What we found out • Alternative energy is essential • Organic PV is a very viable solution • Adding a small moleculealmost doubled our Voc • We need better Jsc and consistency • We all want this jacket for when our phones die: Image: Crunch Wear

  37. Future Work • Vapor deposition of C60 instead of PCBM for consistency -3.1 eV -3.0 eV LUMO Buckministerfullerene (C60) can be vapor deposited for uniform films -4.5 eV P3HT Alq3 C60 HOMO -4.9 eV -5.7 eV -6.2 eV

  38. The people who made this summer awesome… • Professor Alexi Arango,Kanchi Gashaw and Ednah Louie • Sarah Byrne, Len and Thomas • Mount Holyoke College Image: Alexi Arango

More Related