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Aggregation-Tuned Charge Transport and Threshold Voltage Modulation in Poly(3-hexylthiophene) Field-Effect

Byoungnam Park1

  • 1Department of Materials Science and Engineering, Hongik University, 72-1, Sangsu-dong, Mapo-gu, Seoul 04066, Republic of Korea.

Materials (Basel, Switzerland)
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

Optimizing poly(3-hexylthiophene) (P3HT) field-effect transistors (FETs) involves controlling film thickness. Optimal ~10-20 nm thickness balances polymer chain structure for efficient charge transport in P3HT devices.

Keywords:
FETP3HTaggregatemobilitysonicationthreshold voltage

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Area of Science:

  • Organic Electronics
  • Materials Science
  • Polymer Physics

Background:

  • Poly(3-hexylthiophene) (P3HT) is a key organic semiconductor used in electronic devices.
  • Film morphology significantly impacts the performance of P3HT-based field-effect transistors (FETs).
  • Understanding structure-property relationships is crucial for optimizing P3HT device design.

Purpose of the Study:

  • To investigate the thickness-driven optimum in aggregation structure and charge transport of sonicated P3HT FETs.
  • To elucidate the relationship between film thickness, molecular ordering, and device performance.
  • To guide the rational design of P3HT devices for applications like photovoltaics and sensing.

Main Methods:

  • Fabrication and characterization of P3HT FETs with varying film thicknesses.
  • Photoluminescence (PL) spectroscopy to analyze aggregate formation and interchain coupling.
  • X-ray diffraction (XRD) to assess crystalline structure and lamellar ordering.
  • Absorption spectroscopy and Spano model analysis for interchain order evaluation.

Main Results:

  • Mobility peaks at film thicknesses of approximately 10-20 nm.
  • This optimum correlates with minimum photoluminescence vibronic ratio (indicating strong H-aggregate coupling) and sharpened XRD peaks.
  • Optimal mobility arises from a balance between intrachain planarity (J-aggregates) and interchain connectivity (H-aggregates).
  • Excessive thickness leads to over-aggregation, increased trap states, and reduced device performance, evidenced by a sharp rise in threshold voltage.

Conclusions:

  • Film thickness is a critical parameter for optimizing charge transport in P3HT FETs.
  • An optimal balance of polymer aggregation structures (H- and J-aggregates) is essential for high mobility.
  • Solution processing techniques like sonication and precise thickness control can tune P3HT device performance for specific applications.