کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5184233 | 1381042 | 2010 | 9 صفحه PDF | دانلود رایگان |
Three copolymers of benzo[1,2-b:4,5-bâ²]dithiophene and 3,3â²-bis(alkyl)-5,5â²-bithiophene (dodecyl, tetradecyl and hexadecyl side chains) have been synthesized through Stille copolymerization. The polymers have number-average molecular weights over 20Â kg/mol, are well-packed in the bulk and thin film, and possess an ionization potential of â5.1Â eV in thin film, which offers stability versus oxidation in environmental conditions. The thin film packing of the polymer with dodecyl side chains leads to an excimeric emission upon excitation, which is not observed for longer side chain lengths. The presence of the dimers responsible for this excimer formation results in a device performance improvement as well. Field-effect transistors fabricated from these copolymers have On/Off ratios >107, equal saturation and linear hole mobilities above 10â2Â cm2/Vs, almost no hysteresis and turn-on voltages around 0Â V in bottom-contact devices.
Journal: Polymer - Volume 51, Issue 14, 24 June 2010, Pages 3099-3107