Effects of linear side-chain length on the properties and performance of short 2,5-Bis(3-alkylthiophen-2-yl)thienothiophene (BTTT) oligomers are studied. Monomers and Dimers with side-chains of lengths (6, 7, 9, 11, 12, and 16) were synthesized using Stille cross coupling. This study aims to validate any performance-related trends with the molecular packing and thin film characteristics of these oligomer systems. Single-crystal X-Ray Diffraction in conjunction with data from DFT Calculations, GIXD, DSC, AFM, and device performance will confirm the shifts in packing habit and provide a geometric rational to bulk property trends. The proposed research provides a transformative approach to understanding the structure-property relations of side-chains in semiconductor materials through the use of crystallizable oligomers. In addition to understanding the BTTT system, this study represents a fundamental contribution to the field as a whole. The results can be applied to other systems and will aid researchers in designing new semiconductors and better the understanding of those already in use.

Effects of linear side-chains on 2,5-bis-(3-alkylthiophen-2-yl) thienothiophene semiconductors for organic electronics

248th National Meeting (2014)

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