Solution-processable small molecules for bulk heterojunction ambipolar thin-film transistors and complementary-like inverters

Dongil Ho, Sureshraju Vegiraju, Donghee Choi, Chang Hui Cho, Guhyun Kwon, Po Chun Huang, Gene Hsiang Lee, Taeshik Earmme, Shueh Lin Yau, Ming Chou Chen, Choongik Kim

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Solution-processable thioalkylated bithiophene derivatives with different lengths of side chains (SBT-n; n = 10, 12, 14, 16, 18) have been synthesized and characterized as p-channel organic semiconductors for thin-film transistors (TFTs). Based on a combination of the highest performing SBT derivative (SBT-14) and quinoidals (DTTRQs) as p- and n-channel materials, solution-processed small-molecular bulk heterojunction (BHJ) ambipolar thin-film transistors were fabricated, and the resulting devices showed air-stable and high ambipolar performance with well-balanced electron and hole mobilities as high as 0.70 cm 2 V −1 s −1 and 0.21 cm 2 V −1 s −1 , respectively. Furthermore, complementary-like inverters comprising two ambipolar thin-film transistors were demonstrated, which exhibited a high voltage gain of up to 81. Our study clearly demonstrated that side chain engineering of small molecular organic semiconductors had a significant influence on the electrical performance of TFTs and BHJ transistors, as well as complementary-like inverters.

Original languageEnglish
Pages (from-to)725-733
Number of pages9
JournalDyes and Pigments
Volume163
DOIs
StatePublished - Apr 2019

Keywords

  • Bithiophene
  • Bulk heterojunction transistors
  • CMOS inverter
  • Organic semiconductor
  • Organic thin-film transistors

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