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Sureshraju Vegiraju

Sureshraju Vegiraju

National Central University, Taiwan

Title: Intramolecular locked dithioalkyl bithiophene based semiconductors for high performance organic field effect transistors

Biography

Biography: Sureshraju Vegiraju

Abstract

New 3,3’-dithioalkyl-2,2’-bithiophene (SBT) based small molecular and polymeric semiconductors are synthesized by end-capping or co-polymerization with dithienothiophen-2-yl (DTT) units. Single crystal, molecular orbital computations, and optical/electrochemical data indicate that the SBT core is completely planar likely via S(alkyl)∙∙S(thiophene) intramolecular locks. Therefore, compared to semiconductors based on the conventional 3,3’-dialkyl-2,2’-bithiophene (BT), the resulting SBT systems are planar (torsional angle<1o) and highly π-conjugated. Charge transport was investigated for solution-sheared films in field-effect transistors demonstrating that SBT can enable good semiconducting materials with hole mobilities ranging from ~0.03 to 1.7 cm2 V-1 s-1. Transport difference within this family was rationalized by film morphology as accessed by grazing incidence X-ray diffraction (GIXRD) experiments.

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