1. Structure-Function Relationships in Organic Field Effect Transistors Kirsten Parratt Summer 2011 Loo Group

2. Why Organic Semiconductors? An alternative to inorganic electronics: Easier manufacturing Low temperature processing Solution processing Lower costs Flexible substrates What are Organic Semiconductors? What advantages do they offer? Image:s http://www.konarka.com/index.php/power-plastic/about-power-plastic/http://www.konarka.com/index.php/power-plastic/about-power-plastic/ http://www.physorg.com/news/2011-02-carbon-nanotube-transistors-inexpensive-flexible.html

3. How it works-Physical Silicon Silicon Oxide Active Layer Gold Contacts

4. Devices TesADT Cl-TesADT Processing Steps: Weigh out compounds Dissolve in solution Clean SiO 2 wafer Spincast/dropcast onto substrate Evaporate gold contacts

5. Device Results

6. AFM 0 mol% 62.5 mol% 100 mol% 50 mol%

7. DSC

8. Eutectic Grain Boundaries

9. Conclusion At 62.5% ClTesADT and 37.5%TesADT, a eutectic point forms This eutectic point has the highest intermixing and therefore the greatest grain connectivity As a result, OFETs with this molecular structure have higher hole mobility and function better Future work could involve other TesADT derivatives

10. Acknowledgements Professor Loo Stephanie Lee Loo Lab Group Princeton Environmental Institute

12. 12.5mol% 37.5mol%50mol% 62.5mol% 87.5mol%100mol% GIXD