Long-Term Aging Effects in Electrical Devices Based on High-Quality Chemical Vapor Deposition-Grown Single-Domain WSe ₂

Y. Bousbaa; Xingli Wang; Seoung Bum Lim; Aníbal Pacheco-Sánchez; D. Vignaud; Niels Chapuis; Xavier Wallart; Philippe Coquet; B. X. Tay; H. Happy; Emiliano Pallecchi

doi:10.1021/acsaelm.5c02484

January 16, 2026ACS Applied Electronic Materials

Long-Term Aging Effects in Electrical Devices Based on High-Quality Chemical Vapor Deposition-Grown Single-Domain WSe ₂

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Key Points

To evaluate the long-term ambient electrical and morphological stability of field-effect transistors fabricated from chemical vapor deposition-grown multilayer tungsten diselenide across 28 months.
Fabricated single-domain multilayer tungsten diselenide field-effect transistors with nickel/gold (Ni/Au) contact electrodes.
Tracked electrical metrics over 28 months of ambient air exposure using the transmission line method and the Y-function method.
Identified degradation pathways using Raman spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence measurements.
Ambient exposure during the initial six months drove a 34% to 80% decrease in current levels, a 49% reduction in mobility, and increased p-type doping.
Performance degradation stabilized over the subsequent 22 months, exhibiting an additional 11% current reduction, 29% mobility reduction, and a retained average mobility of 16.1 cm²/V·s.
Spectroscopic analyses demonstrated intensity reductions and blue shifts attributed to oxygen chemisorption at selenium vacancies in the material lattice.

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Implication

Experimental study reveals ambient air exposure degrades chemical vapor deposition tungsten diselenide transistors, indicating oxygen chemisorption drives performance loss over 28 months.

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Bousbaa et al. (2026) studied this question.

synapsesocial.com/papers/6a18874836f65e9da61eed72 https://doi.org/10.1021/acsaelm.5c02484

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Long-Term Aging Effects in Electrical Devices Based on High-Quality Chemical Vapor Deposition-Grown Single-Domain WSe ₂

Key Points

No abstract yet

Implication

Discussion

Cite This Study

Long-Term Aging Effects in Electrical Devices Based on High-Quality Chemical Vapor Deposition-Grown Single-Domain WSe ₂

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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