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Solvent-type-dependent Polymorphism and Charge Transport in a Long Fused-Ring Organic Semiconductor

Solvent-type-dependent Polymorphism and Charge Transport in a Long Fused-Ring Organic Semiconductor

Jihua Chen, Ming Shao, Kai Xiao, Adam J Rondinone, Yueh-Lin Loo, Paul R C Kent, Bobby G Sumpter, Dawen Li, Jong K Keum, Peter J Diemer, John E Anthony, Oana D Jurchescu, Jingsong Huang

Nanoscale. 2014 Jan 7;6(1):449-56.

PMID: 24217182

Abstract:

Crystalline polymorphism of organic semiconductors is among the critical factors in determining the structure and properties of the resultant organic electronic devices. Herein we report for the first time a solvent-type-dependent polymorphism of a long fused-ring organic semiconductor and its crucial effects on charge transport. A new polymorph of 5,11-bis(triethylsilylethynyl)anthradithiophene (TES ADT) is obtained using solvent-assisted crystallization, and the crystalline polymorphism of TES ADT thin films is correlated with their measured hole mobilities. The best-performing organic thin film transistors of the two TES ADT polymorphs show subthreshold slopes close to 1 V dec(-1), and threshold voltages close to zero, indicating that the density of traps at the semiconductor-dielectric interface is negligible in these devices and the observed up to 10-fold differences in hole mobilities of devices fabricated with different solvents are largely resultant from the presence of two TES ADT polymorphs. Moreover, our results suggest that the best-performing TES ADT devices reported in the literature correspond to the new polymorph identified in this study, which involves crystallization from a weakly polar solvent (such as toluene and chloroform).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP851817113	TES-ADT		851817-11-3	Price

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