Aging-Enhanced High-Performance Zinc Tin Oxide Transistors and Exploration in Illumination Interface Stability

Area of Science:

• Materials Science
• Semiconductor Physics

Background:

• High-performance thin-film transistors (TFTs) are crucial for modern electronics.
• Zinc tin oxide (ZTO) is a promising material for TFTs due to its properties.
• Optimizing ZTO TFT performance requires addressing defect-related challenges.

Purpose of the Study:

• To develop an innovative post-annealing treatment for high-performance ZTO TFTs.
• To investigate the impact of rapid cooling and aging on ZTO TFT electrical properties.
• To explore the potential applications of treated ZTO TFTs in photoelectric detection.

Main Methods:

• A novel post-annealing rapid cooling and aging treatment process was applied to ZTO TFTs.
• Electrical performance was evaluated before and after the treatment.
• Characterization involved analyzing the relaxation effect on oxygen vacancy deep-level traps.
• The grain boundary defect relaxation model and energy band theory were used for investigation.
• Illumination interface stability was studied using charge trapping and electron-hole pair models.

Main Results:

• TFTs aged in air for 10 days showed a significant increase in on/off current ratio (7 × 10^6) and saturation mobility (5.9 cm^2·V^-1·s^-1).
• Aging under vacuum conditions provided better control over off-state current and a wider aging time window.
• The treatment effectively reduced deep-level traps, leading to shallow donor formation.
• Demonstrated distinctive illumination interface stability, indicating potential for photoelectric applications.

Conclusions:

• The proposed rapid cooling and aging treatment is a facile and effective method to enhance polycrystalline ZTO TFT performance.
• The treatment mechanism involves the relaxation of oversaturated oxygen vacancy traps.
• Treated ZTO TFTs show promise for applications in photoelectric detectors due to their stability and improved characteristics.