A Solution Processable Dithioalkyl Dithienothiophene (DSDTT) Based Small Molecule and Its Blends for High Performance Organic Field Effect Transistors

Chia Chi Lin, Shakil N. Afraj, Arulmozhi Velusamy, Po Chun Yu, Chang Hui Cho, Jianhua Chen, Yi Hsien Li, Gene Hsiang Lee, Shih Huang Tung, Cheng Liang Liu, Ming Chou Chen, Antonio Facchetti

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The 3,5-dithiooctyl dithienothiophene based small molecular semiconductor DDTT-DSDTT (1), end functionalized with fused dithienothiophene (DTT) units, was synthesized and characterized for organic field effect transistors (OFET). The thermal, optical, electrochemical, and computed electronic structural properties of 1 were investigated and contrasted. The single crystal structure of 1 reveals the presence of intramolecular locks between S(alkyl)···S(thiophene), with a very short S-S distance of 3.10 Å, and a planar core. When measured in an OFET device compound 1 exhibits a hole mobility of 3.19 cm2 V-1 s-1, when the semiconductor layer is processed by a solution-shearing deposition method and using environmentally acceptable anisole as the solvent. This is the highest value reported to date for an all-thiophene based molecular semiconductor. In addition, solution-processed small molecule/insulating polymer (1/PαMS) blend films and devices were investigated. Morphological analysis reveals a nanoscopic vertical phase separation with the PαMS layer preferentially contacting the dielectric and 1 located on top of the stack. The OFET based on the blend comprising 50% weight of 1 exhibits a hole mobility of 2.44 cm2 V-1 s-1 and a very smaller threshold voltage shift under gate bias stress.

Original languageEnglish
Pages (from-to)727-738
Number of pages12
JournalACS Nano
Volume15
Issue number1
DOIs
StatePublished - 26 Jan 2021

Keywords

  • 3,5-dithioalkyl dithienothiophene
  • organic semiconductors
  • organic transistor
  • polymer blend
  • solution-processing

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