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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
Summary
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.
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.
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