Large Modulation of Charge Carrier Mobility in Doped Nanoporous Organic Transistors

Fengjiao Zhang, Xiaojuan Dai, Weikun Zhu, Hyunjoong Chung, Ying Diao

Research output: Contribution to journalArticlepeer-review

Abstract

Molecular doping of organic electronics has shown promise to sensitively modulate important device metrics. One critical challenge is the disruption of structure order upon doping of highly crystalline organic semiconductors, which significantly reduces the charge carrier mobility. This paper demonstrates a new method to achieve large modulation of charge carrier mobility via channel doping without disrupting the molecular ordering. Central to the method is the introduction of nanopores into the organic semiconductor thin films via a simple and robust templated meniscus-guided coating method. Using this method, the charge carrier mobility of C8-benzothieno[3,2-b]benzothiophene transistors is boosted by almost sevenfold. This paper further demonstrates enhanced electron transport by close to an order of magnitude in a diketopyrrolopyrrole-based donor–acceptor polymer. Combining spectroscopic measurements, density functional theory calculations, and electrical characterizations, the doping mechanism is identified as partial-charge-transfer induced trap filling. The nanopores serve to enhance the dopant/organic semiconductor charge transfer reaction by exposing the π-electrons to the pore wall.

Original languageEnglish (US)
Article number1700411
JournalAdvanced Materials
Volume29
Issue number27
DOIs
StatePublished - Jul 19 2017

Keywords

  • doping
  • morphology
  • nanopores
  • organic field-effect transistors
  • solution coating

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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