Highly flexible and transparent multilayer MoS2 transistors with graphene electrodes

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Traditional transistors often lack flexibility and transparency, limiting their applications in wearable and transparent electronic devices.
• Molybdenum disulfide (MoS2) and graphene are 2D nanomaterials with unique electronic and optical properties.

Purpose of the Study:

• To develop a highly flexible and transparent transistor using MoS2 and graphene.
• To evaluate the performance and stability of these novel 2D material-based transistors.

Main Methods:

• Fabrication of a transistor with an exfoliated MoS2 channel and chemical vapor deposition (CVD)-grown graphene source/drain electrodes.
• Characterization of the transistor's mechanical flexibility, optical transmittance, current on/off ratio, field-effect mobility, and Schottky barrier height.
• Testing of device performance stability under mechanical bending and recovery after degradation.

Main Results:

• The developed transistor demonstrated high mechanical flexibility and optical transmittance (∼74%).
• Achieved a high current on/off ratio (>10^4) and an average field-effect mobility of ∼4.7 cm^2 V^-1 s^-1.
• A low Schottky barrier (∼22 meV) was observed at the MoS2/graphene interface, comparable to MoS2/metal interfaces.
• Devices maintained electronic performance stability during bending and recovered properties after annealing.

Conclusions:

• The integration of 2D nanomaterials like MoS2 and graphene enables the creation of highly flexible and transparent transistors.
• The developed device architecture offers superior performance and stability compared to conventional transistors.
• This work highlights the potential of 2D materials for next-generation flexible and transparent electronic applications.