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Title: Polyferrocenylsilane Semicrystalline Polymer Additive for Solution-Processed p-Channel Organic Thin Film Transistors

Journal Article · · Polymers
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Electrical and Computer Engineering; OSTI
  2. Columbia Univ., New York, NY (United States). Dept. of Electrical Engineering
  3. Pennsylvania State Univ., Erie, PA (United States). Behrend. Dept. of Electrical and Computer Engineering
  4. Dalin Univ. of Technology (China). Key Lab. for Precision and Non-Traditional Machining Technology of the Ministry of Education
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  6. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Electrical and Computer Engineering

In this study, we demonstrated for the first time that a metal-containing semicrystalline polymer was used as an additive to mediate the thin film morphology of solution-grown, small-molecule organic semiconductors. By mixing polyferrocenylsilane (PFS) with an extensively-studied organic semiconductor 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene), PFS as a semicrystalline polymer independently forms nucleation and crystallization while simultaneously ameliorating diffusivity of the blend system and tuning the surface energies as a result of its partially amorphous property. We discovered that the resultant blend film exhibited a 6-fold reduction in crystal misorientation angle and a 3-fold enlargement in average grain width. Enhanced crystal orientation considerably reduces mobility variation, while minimized defects and trap centers located at grain boundaries lessen the adverse impact on the charge transport. Consequently, bottom-gate, top-contact organic thin film transistors (OTFTs) based on the TIPS pentacene/PFS mixture yielded a 40% increase in performance consistency (represented by the ratio of average mobility to the standard deviation of mobility). The PFS semicrystalline polymer-controlled crystallization can be used to regulate the thin film morphology of other high-performance organic semiconductors and shed light on applications in organic electronic devices.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1815617
Journal Information:
Polymers, Journal Name: Polymers Journal Issue: 3 Vol. 13; ISSN POLYCK; ISSN 2073-4360
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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