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Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors
Yonatan Vaknin1, Ronen Dagan2, Yossi Rosenwaks3
1School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel. yhonatan.v@gmail.com.
Nanomaterials (Basel, Switzerland)
|June 19, 2019
Summary
Researchers used Kelvin probe force microscopy to study molybdenum disulfide (MoS2) field-effect transistors (FETs). This study provides direct evidence of pinch-off formation in MoS2 FETs, crucial for post-silicon nanoelectronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Layered materials, such as transition metal dichalcogenides (TMDs), enable novel nanoelectronic devices.
- Molybdenum disulfide (MoS2) is a promising post-silicon semiconductor due to its stability.
- Field-effect transistors (FETs) are key components in modern electronics.
Purpose of the Study:
- To investigate the electrostatic potential distribution in MoS2 FETs.
- To provide direct evidence of pinch-off formation in MoS2 FET channels.
- To compare the behavior of monolayer and few-layer MoS2 FETs.
Main Methods:
- Kelvin probe force microscopy (KPFM) was employed for in situ monitoring.
- The electrostatic potential distribution along the conducting channel was analyzed.
- A systematic comparison between monolayer and few-layer MoS2 FETs was conducted.
Main Results:
- Direct evidence of pinch-off formation in the MoS2 FET channel was observed.
- The study revealed detailed insights into gating effects and electric field distribution.
- Differences in depletion region and pinch-off formation between monolayer and few-layer MoS2 FETs were systematically compared.
Conclusions:
- KPFM is effective for in situ monitoring of electrostatic potential in MoS2 FETs.
- Understanding pinch-off formation is critical for optimizing MoS2-based nanoelectronic devices.
- The study provides valuable data for the development of next-generation electronics using MoS2.
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