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Wafer-Scale Heterogeneous Integration of High-Resolution Micro-LED Displays with Carbon Nanotube Thin-Film
Anqi Zheng1, Yujia Gong1, Di Liu1
1Research Center for Carbon-Based Electronics, School of Electronics, Peking University, Beijing 100871, China.
ACS Nano
|February 5, 2026
Summary
Researchers developed a novel carbon nanotube thin-film transistor (CNT-TFT) backplane for direct-view micro-light-emitting-diode (micro-LED) displays. This scalable technology enables high-resolution, large-area micro-LED panels using advanced carbon electronics.
Area of Science:
- Materials Science
- Electronics Engineering
- Display Technology
Background:
- Direct-view micro-light-emitting-diode (micro-LED) displays require thin-film transistors (TFTs) with high driving current and low-temperature, scalable fabrication.
- Semiconducting carbon nanotube TFTs (CNT-TFTs) offer potential due to their driving capability and simple processing, but large-area integration remains a challenge.
Purpose of the Study:
- To demonstrate a direct-view micro-LED display driven by glass-substrate CNT-TFT backplanes.
- To establish a scalable approach for large-area, high-pixel-density micro-LED panels using carbon electronics.
Main Methods:
- Developed a CNT backplane technology processed below 250 °C on 4-inch glass substrates.
- Incorporated an etch-stop layer (ESL) technique for uniformity and manufacturing compatibility.
- Utilized nitrogen annealing and a yttrium oxide (Y2O3) interlayer to enhance charge trap passivation and device performance.
Main Results:
- Demonstrated a 1.68-inch micro-LED display prototype with 117,600 micro-LEDs at 300 PPI resolution.
- Achieved a field-effect mobility of 30.1 cm²/V·s and an on/off ratio of 1.09 × 10⁷ at 16 μm channel length.
- Established a benchmark in size and resolution for micro-LED displays utilizing low-dimensional semiconductor TFTs.
Conclusions:
- The developed CNT-TFT backplane technology is scalable for large-area, high-pixel-density micro-LED panels.
- This work paves the way for next-generation display applications enabled by carbon electronics.
- The integration of CNT-TFTs offers a viable solution for advanced display manufacturing.
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