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Crystallization of Small Molecules for Organic Electronic Applications

Crystallization of Small Molecules for Organic Electronic Applications. Jessica Lynn Saylors, Anna Hiszpanski, and Yueh-Lin (Lynn) Loo 07 October 2011 Summer of Learning Symposium 2011. Mechanically Flexible Large Area Chemical Versatility. Why organic electronics?. www.plasticlogic.com.

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Crystallization of Small Molecules for Organic Electronic Applications

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  1. Crystallization of Small Molecules for Organic Electronic Applications Jessica Lynn Saylors, Anna Hiszpanski, and Yueh-Lin (Lynn) Loo 07 October 2011 Summer of Learning Symposium 2011

  2. Mechanically Flexible Large Area Chemical Versatility Why organic electronics? www.plasticlogic.com

  3. Transistors – Building Blocks of Organic Electronics organic semiconductor drain Organic field-effect transistor (OFET) How an Transistor works 0 V -1 V 0 V -5 V 0 V 0 V S D Organic + + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - Insulator + + + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - Gate electrode -5 V -5 V source 0 V Cut-off regime Linear regime Saturation regime gate + dielectric

  4. HBC Contorted Hexabenzocoronene (HBC) Xiao, S. et al. Angew. Chem. Int. Ed. 2005.

  5. Crystallizing HBC Thin Films Amorphous HBC π stacking Partially Crystallized HBC π-face HBC

  6. Thermal Evaporation Thickness Gradient: 15nm – 250nm

  7. HBC Mobility vs. Thickness

  8. Macroscopic Morphology 15nm 33nm 50nm 120nm

  9. Optical Micrographs for Kinetics Analysis HBC thin film - annealed at 240°C t = 0.5 min t = 1 min t = 1.5 min t = 2 min t = 2.5 min t = 3 min

  10. Avrami Kinetics n: variable that gives some indication regarding mode of crystallization %crystallized K: indication of the rate of crystallization

  11. Avrami n vs. Thickness

  12. Avrami n vs. Thickness

  13. American Institute of Chemical Engineers http://www.aiche.org/Students/Conferences/national.aspx http://www.minneapolisconventioncenter.com/

  14. Acknowledgments • Loo Group • Anna Hiszpanski • Professor Loo • Princeton Environmental Institute • Siebel Energy Grand Challenge Loo Group, March 2011 http://www.princeton.edu/pei/

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