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Solution-Processed Ambipolar Thin Film Transistors-Based Inverters for Circuit Applications.

Min Ki Kim1, Swarup Biswas1, Yongju Lee1,2

  • 1School of Electrical and Computer Engineering, Center For Smart Sensor System of Seoul (CS4), University of Seoul, Dongdaemun-gu, Seoul, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|March 19, 2026
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Summary
This summary is machine-generated.

Researchers developed solution-processed organic thin-film transistors (OTFTs) using a single semiconductor blend. This breakthrough enables balanced charge transport for efficient, low-cost flexible electronics and printed logic circuits.

Keywords:
DPP‐DTT:N2200 ambipolar invertersambipolar organic thin‐film transistorsbulk heterojunction polymer blendscomplementary‐like organic logic circuits

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Semiconductor Physics

Background:

  • Fully solution-processed organic thin-film transistors (OTFTs) offer potential for flexible, large-area, and low-cost electronics.
  • Challenges include mobility imbalance, instability, and complex fabrication, limiting circuit implementation.

Purpose of the Study:

  • To develop a single active semiconductor platform for ambipolar OTFTs and complementary-like logic using bulk-heterojunction blends.
  • To enable balanced electron and hole transport, high on/off ratios, and stable operation through systematic tuning of blend composition.

Main Methods:

  • Employed bulk-heterojunction blends of N2200 (n-type) and DPP-DTT (donor) polymers.
  • Systematically tuned the DPP-DTT:N2200 composition to optimize performance.
  • Utilized correlated optical, energetic, and structural characterizations to analyze morphology.
  • Fabricated top-gate ambipolar inverters with scaled channel widths.

Main Results:

  • Achieved balanced electron and hole transport and high on/off current ratios (∼10^5).
  • Identified a 5:95 DPP-DTT:N2200 blend as optimal for mobility symmetry and stability.
  • Observed semi-intermixed morphology with bi-continuous percolation pathways and controlled crystallinity.
  • Demonstrated all-polymer ambipolar inverters with sharp switching and high small-signal gains (up to 19).

Conclusions:

  • Co-engineering blend composition, microstructure, and device geometry is a manufacturing-compatible strategy.
  • Enables scalable printed organic logic using a single bulk heterojunction semiconductor.
  • Overcomes limitations of separate p-type and n-type materials for ambipolar applications.