1 / 18

Polymer Crystallization on Curved Surfaces

Polymer Crystallization on Curved Surfaces. Steve Kuei. Overview. Introduction Organic electronics Motivation Experimental Previous work Buckling Structures Atomic Force Microscopy Conclusions Future work. Organic Electronics. Solar Cells. Al. ITO. Motivation.

kumiko
Télécharger la présentation

Polymer Crystallization on Curved Surfaces

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. Polymer Crystallization on Curved Surfaces Steve Kuei

  2. Overview • Introduction • Organic electronics • Motivation • Experimental • Previous work • Buckling Structures • Atomic Force Microscopy • Conclusions • Future work

  3. Organic Electronics • Solar Cells Al ITO

  4. Motivation • Polymer crystallization

  5. Previous work A. Hexemer, V. Vitelli, E.J. Kramer, G. H. Fredrickson

  6. Previous work A. Hexemer, V. Vitelli, E.J. Kramer, G. H. Fredrickson

  7. Curvature • Principal curvatures, • Mean curvature – average of principal curvatures • Gaussian Curvature – product of principal curvatures

  8. Buckling Structures

  9. Atomic Force Microscopy Images by Vijay Narayan Wikipedia, by Askewmind

  10. AFM and buckling structures

  11. AFM and buckling structures

  12. P3EHT M.W. 7k g/mol Polymer synthesized by Segalman Group, Berkeley

  13. P3EHT – spin coated

  14. P3EHT – annealed for 12 hours

  15. P3EHT – annealed for 12 hours

  16. P3EHT – annealed for 2 days

  17. Future work • Film thickness • Currently too thick, pooling in trenches • Orientation underneath surface layer is unknown • Buckling structures • Need to optimize amplitude and period of buckling structures so that polymer stays on the peaks • Need to control buckling structures to have regularly occurring gaussian curvature • Conclusions • Gaussian curvature appears to dominate, especially after annealing for longer periods of time, aligning polymer fibers along the troughs.

  18. Acknowledgements • Princeton Environmental Institute Energy Grand Challenge • MIRTHE/PCCM REU program • Professor Loo, Professor Yao, Dr. Hexemer • Eleni Pavlopoulou, Jongbok Kim, Stephanie Lee, Pilnam Kim, Rich Fiorillo, Atray Dixit, Vijay Narayan

More Related