High-performance p-channel transistors with transparent Zn doped-CuI

Area of Science:

• Materials Science and Engineering
• Solid-State Physics
• Semiconductor Device Physics

Background:

• Transparent p-type semiconductors are crucial for advanced electronic devices like thin-film transistors (TFTs).
• Copper iodide (CuI) shows promise due to its opto-electrical properties and low-temperature processability.
• However, uncontrolled copper vacancies in CuI lead to excessive hole doping, limiting its application in TFTs.

Purpose of the Study:

• To develop a stable and high-performance transparent p-type semiconductor for TFTs.
• To overcome the limitations of uncontrolled doping in copper iodide (CuI).
• To investigate the potential of zinc-doped copper iodide (CuI:Zn) for next-generation electronics.

Main Methods:

• A soft chemical solution process was employed to synthesize transparent p-type zinc-doped copper iodide (CuI:Zn).
• Thin-film transistors (TFTs) were fabricated using the CuI:Zn semiconductor.
• Optimized annealing at 80°C was performed to achieve desired material properties.

Main Results:

• The optimized CuI:Zn TFTs achieved a high hole mobility exceeding 5 cm² V⁻¹ s⁻¹.
• An excellent on/off current ratio of approximately 10⁷ was recorded.
• The devices demonstrated good operational stability and reproducibility.

Conclusions:

• Zinc doping effectively controls copper vacancy generation, enabling high-performance transparent p-type CuI:Zn semiconductors.
• CuI:Zn exhibits significant advantages for future TFT applications, optoelectronics, and energy devices.
• This research facilitates the development of transparent, flexible, and large-area integrated circuits.