Effect of post-deposition annealing temperature on the charge carrier mobility and morphology of DPPDTT based organic field effect transistors

Abstract

There is a considerable research interest in enhancing the charge carrier mobility of polymer-based organic field effect transistors (OFETs) through processing techniques. Herein, we investigate the effect of post-deposition annealing temperature on morphology and mobility of solution processible polymer Poly[2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno [3,2-b]thiophene)], (DPPDTT) based OFETs. The resulting change in the grain size is proportional to the mobility data. At temperatures higher than 100 °C, grain size decreased with obvious desorption due to low Van der Waals forces in the polymer. Our results will hence contribute towards understanding the annealing mechanism in polymers to optimize the performance of DPPDTT based devices.