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Reconfigurable Complementary Monolayer MoTe2 Field-Effect Transistors for Integrated Circuits.
Stefano Larentis1, Babak Fallahazad1, Hema C P Movva1
1Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin , Austin, Texas 78758, United States.
ACS Nano
|April 18, 2017
Summary
Researchers developed a new complementary field-effect transistor using molybdenum ditelluride (MoTe2) with low-resistance contacts. This breakthrough enables advanced electronic circuits and devices like inverters and diodes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Transition metal dichalcogenides (TMDs) show promise for future electronic switches.
- Developing complementary field-effect transistors (FETs) is challenging due to the difficulty in achieving low-resistance electron and hole contacts on the same material.
- Monolayer MoTe2 is a potential candidate for next-generation electronics.
Purpose of the Study:
- To demonstrate an air-stable, reconfigurable complementary monolayer MoTe2 FET.
- To overcome the limitations of contact resistance and threshold voltage tuning in TMD-based FETs.
- To enable the development of complementary circuits using TMDs.
Main Methods:
- Fabrication of a complementary monolayer MoTe2 field-effect transistor encapsulated in hexagonal boron nitride.
- Utilizing electrostatically doped contacts for independent control of contact resistance and threshold voltage.
- Implementing a multigate design with prepatterned bottom contacts.
- Decoupling Schottky contacts from channel gating.
Main Results:
- Achieved an air-stable, reconfigurable complementary monolayer MoTe2 FET.
- Demonstrated independent low contact resistance and threshold voltage tuning.
- Successfully decoupled Schottky contacts and channel gating.
- Illustrated potential applications including a complementary inverter and a p-i-n diode.
Conclusions:
- The developed MoTe2 FET addresses key challenges in TMD-based electronics.
- The multigate design with electrostatically doped contacts is effective for complementary circuits.
- This work paves the way for advanced TMD-based complementary field-effect transistors and integrated circuits.