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

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52 Scopus citations


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
Issue number14
StatePublished - 9 Apr 2014


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


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