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THESIS DEFENSE of Yifan WANG - July 2, 2025

Yifan WANG will defend her thesis on July 2, 2025 at 09:30 am in the amphitheater JP. DOM of the IMS Laboratory, on the subject: Characterization and modeling of Junctionless Vertical Si Nanowire Transistor for 3D logic circuits .

In this thesis, we develop accurate compact models for the JL-VNWFETs through extensive static, dynamic and thermal characterizations. We also performed reliability characterization and associated analysis of the underlying degradation mechanisms for implementing a compact model of Negative Bias Temperature Instability in the JL-VNWFETs. The final compact model can then be used for performance prediction of 3D logic circuits under different operating conditions and provide feedback to process engineers through a Design Technology Co-Optimization loop, thus constituting a critical link in the value chain of 3D JL-VNWFET based hardware design.

False-color TEM image of different layers of a single Si nanowire and 3D representation of a passive NOR [1]

Simulations and DC measurements results of Id-Vg and Id -Vd

Randomly distributed defects in SiO2 and Si-SiO2 interface used in the TCAD model on GTS framework

[1] A. Kumar, J. Müller, S. Pelloquin, A. Lecestre, et G. Larrieu, « Logic Gates Based on 3D Vertical Junctionless Gate-All-Around Transistors with Reliable Multilevel Contact Engineering », Nano Lett., vol. 24, no 26, p. 7825‑7832, juill. 2024, doi: 10.1021/acs.nanolett.3c04180.

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