An important strategy for realizing flexible complementary circuits with organic semiconductors is to achieve balanced ambipolar charge transport properties with reduced anisotropy. Here, we present a series of star-shaped diketopyrrolopyrrole (DPP)-based organic materials synthesized for improved intermolecular charge transport while retaining the ambipolar charge transport properties of their linear counterparts. Steady-state UV–visible spectroscopic studies confirm that the oligomers are highly aggregated in the thin film as evidenced from appearance of prominent vibronic features and red-shifted absorption bands. Ambipolar transport properties of these materials were verified in organic field-effect transistors (OFETs). The results show that the star-shaped DPP systems have the potential to outperform their linear counterparts in devices.
|Original language||English (US)|
|Number of pages||10|
|Journal||ACS Applied Electronic Materials|
|State||Published - Sep 3 2019|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: S.R. thanks the University Grants Commission (UGC), New Delhi, for Dr. D. S. Kothari’s postdoctoral fellowship. S.P. thanks the Department of Science and Technology, New Delhi, India, for a Swarnajayanti fellowship and acknowledges financial support from UKRI Global Challenge Research Fund Project, SUNRISE (Grant EP/P032591/1). We sincerely acknowledge CENSE, IISc for the AFM, GIXRD, and UPS measurements.