Solution-processed small-molecule bulk heterojunction ambipolar transistors

Shiau Shin Cheng, Peng Yi Huang, Mohan Ramesh, Hsiu Chieh Chang, Li Ming Chen, Chia Ming Yeh, Chun Lin Fung, Meng Chyi Wu, Chung Chi Liu, Choongik Kim*, Hong-Cheu Lin, Ming Chou Chen, Chih Wei Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Solution-processed small-molecule bulk heterojunction (BHJ) ambipolar organic thin-film transistors are fabricated based on a combination of [2-phenylbenzo[d,d']thieno[3,2-b;4,5-b']dithiophene (P-BTDT): 2-(4-n-octylphenyl)benzo[d,d']thieno[3,2-b;4,5-b']dithiophene (OP-BTDT)] and C60. Treating high electrical performance vacuum-deposited P-BTDT organic semiconductors with a newly developed solution-processed organic semiconductor material, OP-BTDT, in an optimized ratio yields a solution-processed p-channel organic semiconductor blend with carrier mobility as high as 0.65 cm2 V-1 s-1. An optimized blending of P-BTDT:OP-BTDT with the n-channel semiconductor, C60, results in a BHJ ambipolar transistor with balanced carrier mobilities for holes and electrons of 0.03 and 0.02 cm2 V-1 s-1, respectively. Furthermore, a complementary-like inverter composed of two ambipolar thin-film transistors is demonstrated, which achieves a gain of 115.

Original languageEnglish
Pages (from-to)2057-2063
Number of pages7
JournalAdvanced Functional Materials
Volume24
Issue number14
DOIs
StatePublished - 9 Apr 2014

Keywords

  • ambipolar
  • bulk heterojunctions
  • inverters
  • solution process
  • thin-film transistors

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