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. shu

Solution-grown aligned crystals of diketopyrrolopyrroles (DPP)-based small molecules: Rough surfaces and relatively low charge mobility

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received Date: 31 December 2015
Revised Date: 25 January 2016

Fund Project: This work was supported by the 973 Program (No. 2014CB643503), National Natural Science Foundation of China (Nos. 51373150, 51461165301), Zhejiang Province Natural Science Foundation (No. LZ13E030002) and Fundamental Research Funds for the Central Universities.

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.
- Diketopyrrolopyrrole,
- Crystals,
- Solution processing,
- Organic field-effect transistors,
- Morphology
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