Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 44, Pages 17402-17407Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8068305
Keywords
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Funding
- Office of Naval Research Young Investigator Program
- Department of Energy
- Royal Thai Government Scholarship
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Two new oligothiophene derivatives bearing a diketopyrrolopyrrole core, 2,5-di-n-hexyl-3,6-bis(5 ''-nhexyl[2,2';5',2 '']terthiophen-5-yl)pyrrolo[3,4-c]pyrrole-1,4-dione (DHT6DPPC6) and 2,5-di-n-dodecyl-3,6-bis(5 ''-n- hexyl[2,2';5',2 '']terthiophen-5-yl)pyrrolo[3,4.-c]pyrrole-1,4-dione (DHT6DPPC12), and their use in solution-processed organic field effect transistors are reported. Depending on the type of alkyl substiment and film annealing temperature, the crystal grain sizes and interlayer spacing vary as observed using atomic force microscopy and X-ray diffractometry, respectively. These changes in film morphology and interlayer spacing lead to an order of magnitude difference in the field effect mobilities. The field effect mobilities for annealed DHT6DPPC6 and DHT6DPPC12 films are 0.02 and 0.01 cm(2)/V s, respectively.
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