RbNO₃ Wet Chemical Treatment for Contact Engineering and Enhanced Performance of a-IGTO TFTs with Improved Stability

Area of Science:

• Materials Science
• Semiconductor Physics
• Device Engineering

Background:

• Amorphous indium gallium tin oxide (a-IGTO) is a key material for next-generation thin-film transistors (TFTs) due to its excellent properties.
• High contact resistance and instability from defects limit the performance and reliability of a-IGTO TFTs.

Purpose of the Study:

• To develop a simple and effective method to overcome the limitations of a-IGTO semiconductor devices.
• To improve the performance and stability of amorphous oxide semiconductor devices.

Main Methods:

• A rubidium nitrate wet chemical treatment (WCT) was applied to Al/a-IGTO interfaces.
• Surface morphology, cation diffusion, resistivity, and device stability were analyzed.

Main Results:

• WCT reduced contact and channel resistivity by 4x and 7x, respectively.
• Field-effect mobility increased from 10.1 to 22.54 cm²/V·s, and subthreshold swing improved to 0.14 V/dec.
• Device stability under various stress conditions was significantly enhanced due to suppressed oxygen vacancies.

Conclusions:

• The rubidium nitrate WCT effectively addresses contact resistance and stability issues in a-IGTO TFTs.
• Synergistic effects of surface modification and Rb incorporation lead to high-performance, reliable oxide TFTs.
• This approach paves the way for advanced electronic applications utilizing oxide semiconductors.