Citation: Zhuo-Ting Huang, Cong-Cheng Fan, Guo-Biao Xue, Jia-Ke Wu, Shuang Liu, Huan-Bin Li, Hong-Zheng Chen, Han-Ying Li. Solution-grown aligned crystals of diketopyrrolopyrroles (DPP)-based small molecules: Rough surfaces and relatively low charge mobility[J]. Chinese Chemical Letters, ;2016, 27(4): 523-526.
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Field-effect transistors (FETs) of three diketopyrrolopyrroles (DPP)-based small molecules, 3, 6-bis(5-phenylthiophene-2-yl)-2, 5-bis(2-ethylhexyl)pyrrolo[3, 4-c]pyrrole-1, 4-dione (PDPPP), 3, 6-bis(5-(4-fluorophenyl) thiophene-2-yl)-2, 5-bis(2-ethylhexyl)pyrrolo[3, 4-c]pyrrole-1, 4-dione (FPDPPPF) and 3, 6-bis(5-(4-n-butylphenyl)thiophene-2-yl)-2, 5-bis(2-ethylhexyl)pyrrolo[3, 4-c]pyrrole-1, 4-dione (BuPDPPPBu), have been studied in this work. Well aligned crystals of the three molecules were grown from para-xylene by droplet-pinned crystallizationmethod. FETs based on these aligned crystals exhibit a holemobility up to 0.19 cm2 V-1 s-1 and electronmobility up to 0.008 cm2 V-1 s-1. The achieved hole mobility is of the same order of magnitude as reported highest hole mobility for DPP-based small molecules, but it is much lower than that of the high-performanceDPP-based polymers. The relative lowmobility ismainly attributed to the rough crystal surfaces with steps and, thus, non-smooth charge transport channels at the interfaces between the crystals and the dielectrics. This work has implications for understanding the low charge mobility of DPP-based small molecules.
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