Dressing AgNWs with MXenes Nanosheets: Transparent Printed Electrodes Combining High-Conductivity and Tunable Work...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• High-work function transparent electrodes (HWFTEs) are crucial for semiconductor device contacts.
• Achieving printable HWFTEs with high transmittance, low resistance, and tunable work function is challenging.

Purpose of the Study:

• To develop a novel, high-performance HWFTE using a Ag nanowire/Ti3C2Tx nanosheet core-shell structure.
• To investigate the impact of work function tuning on optoelectronic device performance.
• To explore the electrode-semiconductor contact physics for advanced applications.

Main Methods:

• Fabrication of HWFTEs via printing Ag nanowires conformally coated with Ti3C2Tx nanosheets.
• Characterization of optical transmittance, sheet resistance, and work function.
• Integration into Ga2O3 diode DUV photodetectors and organic light-emitting transistors.
• Experimental validation and theoretical calculations of contact physics.

Main Results:

• The printed TA HWFTEs achieved >94% transmittance (DUV-visible), <15 Ω sq-1 sheet resistance, and tunable work function (4.7–6.0 eV).
• Oxygen terminations on Ti3C2Tx enhanced work function and elevated the Schottky barrier, leading to 18 mA W-1 responsivity in Ga2O3 DUV photodetectors.
• Organic light-emitting transistors demonstrated a 4x higher emission brightness (5020 cd m-2) compared to Au electrodes.

Conclusions:

• The Ag nanowire/Ti3C2Tx core-shell structure provides a high-performance, printable HWFTE solution.
• Work function tuning via surface modification significantly improves photodetector and transistor performance.
• This work advances electrode-semiconductor contact physics for next-generation optoelectronics.