Preparation of stretchable organic semiconductors through photocrosslinking
Organic semiconductor materials exhibit promising prospects for flexible device applications due to their excellent solution processability and superior charge transport performance.This work proposed a method for preparing a stretchable organic semiconductor material.By using benzophenone as a photoinitiator,the conjugated polymer 3,6-dithiophene-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-diketone(4Si)was crosslinked with polydimethylsiloxane.The alterations in the electrical and mechanical properties of the polymer films were thoroughly investigated on both pre-and post-crosslinking.Compared to the uncrosslinked 4Si and blend films,the electrical properties of the crosslinked films slightly decreased,while the mechanical properties were enhanced.The crack onset-strain has increased from 30%to 50%.Furthermore,at 100%strain,the crosslinked film exhibited a mobility of 0.36 cm2·V-1·s-1 in the parallel strain direction,which is 1.44 times higher than the initial mobility.
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