Affiliation:
1. School of Semiconductor Science and Technology South China Normal University Foshan 528225 P. R. China
2. School of Information and Communication Engineering North University of China Taiyuan 030051 P. R. China
3. College of Semiconductors (College of Integrated Circuits) Hunan University Changsha 410082 P. R. China
4. Guangdong Provincial Key Laboratory of Chip and Integration Technology Guangzhou 510631 P. R. China
5. College of Optical Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
Abstract
AbstractFerroelectric negative capacitance transistors (Fe‐NCFETs) have emerged as a promising technology for low‐power electronics and have the potential to continue Moore's law. However, the existing 2D ferroelectric materials are predominantly sulfides or halides, which are susceptible to oxidation or hydrolysis, thereby hindering their commercial production due to concerns related to performance and stability. To address these obstacles, the authors have optimized the Fe‐NCFETs composed of 2D ferroelectric CuInP2S6 and semiconductor WS2 using high‐k Al2O3 passivation and dual‐gate modulation strategy. With atomic layer deposition (ALD) of Al2O3, all‐2D Fe‐NCFETs, operated at a low driven voltage of 0.3 V, achieve much improvement in stability and performance with a high ON/OFF ratio of 109 and minimum subthreshold swing (SS) of 14 mV dec−1, which is attributed to the negative capacitance effect of CuInP2S6 and passivation effect of ALD‐Al2O3. The dual‐gate modulation approach is also implemented to maintain the device stability and enable the improved ON/OFF ratio from 105 to 108, minimum SS of 10 mV dec−1, and an average SS of ≈60 mV dec−1 covering more than five orders of magnitude of current. This work provides a facile and effective strategy for designing all‐2D Fe‐NCFETs with ultra‐steep SS and high stability, showing exciting potential for future low‐power electronic applications.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
5 articles.
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