Engineering The Palladium-WSe₂ Interface Chemistry for Field Effect Transistors with High-Performance Hole Contacts
dc.contributor.ORCID | 0000-0001-5566-4806 (Wallace, RM) | |
dc.contributor.ORCID | 0000-0003-0690-7423 (Young, CD) | |
dc.contributor.ORCID | 0000-0003-2781-5149 (Kim, J) | |
dc.contributor.ORCID | 0000-0002-6688-8626 (Walsh, LA) | |
dc.contributor.ORCID | 0000-0002-5485-6600 (Hinkle, CD) | |
dc.contributor.ORCID | 0000-0002-5454-0315 (Addou, R) | |
dc.contributor.VIAF | 70133685 (Kim, J) | |
dc.contributor.author | Smyth, Christopher M. | |
dc.contributor.author | Walsh, Lee A. | |
dc.contributor.author | Bolshakov, Pavel | |
dc.contributor.author | Catalano, Massimo | |
dc.contributor.author | Addou, Rafik | |
dc.contributor.author | Wang, Luhua | |
dc.contributor.author | Kim, Jiyoung | |
dc.contributor.author | Kim, Moon J. | |
dc.contributor.author | Young, Chadwin D. | |
dc.contributor.author | Hinkle, Christopher L. | |
dc.contributor.author | Wallace, Robert M. | |
dc.contributor.utdAuthor | Smyth, Christopher M. | |
dc.contributor.utdAuthor | Walsh, Lee A. | |
dc.contributor.utdAuthor | Bolshakov, Pavel | |
dc.contributor.utdAuthor | Catalano, Massimo | |
dc.contributor.utdAuthor | Addou, Rafik | |
dc.contributor.utdAuthor | Wang, Luhua | |
dc.contributor.utdAuthor | Kim, Jiyoung | |
dc.contributor.utdAuthor | Kim, Moon J. | |
dc.contributor.utdAuthor | Young, Chadwin D. | |
dc.contributor.utdAuthor | Hinkle, Christopher L. | |
dc.contributor.utdAuthor | Wallace, Robert M. | |
dc.date.accessioned | 2020-08-31T20:06:13Z | |
dc.date.available | 2020-08-31T20:06:13Z | |
dc.date.issued | 2018-12-07 | |
dc.description | Due to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article). | |
dc.description.abstract | Palladium has been widely employed as a hole contact to WSe₂ and has enabled, at times, the highest WSe₂ transistor performance. However, there are orders of magnitude variation across the literature in Pd-WSe₂ contact resistance and I-ON/I-OFF ratios with no true understanding of how to consistently achieve high-performance contacts. In this work, WSe₂ transistors with impressive I-ON/I-OFF ratios of 10(6) and Pd-WSe₂ Schottky diodes with near-zero variability are demonstrated utilizing Ohmic-like Pd contacts through deliberate control of the interface chemistry. The increased concentration of a PdSeₓ intermetallic is correlated with an Ohmic band alignment and concomitant defect passivation, which further reduces the contact resistance, variability, and barrier height inhomogeneity. The lowest contact resistance occurs when a 60 min post-metallization anneal at 400 degrees C in forming gas (FG) is performed. X-ray photoelectron spectroscopy indicates this FG anneal produces 3x the concentration of PdSeₓ and an Ohmic band alignment, in contrast to that detected after annealing in ultrahigh vacuum, during which a 0.2 eV hole Schottky barrier forms. Raman spectroscopy and scanning transmission electron microscopy highlight the necessity of the fabrication step to achieve high-performance contacts as no PdSeₓ forms, and WSe₂ is unperturbed by room temperature Pd deposition. However, at least one WSe₂ layer is consumed by the necessary interface reactions that form PdSeₓ requiring strategic exploitation of a sacrificial WSe₂ layer during device fabrication. The interface chemistry and structural properties are correlated with Pd-WSe₂ diode and transistor performance, and the recommended processing steps are provided to enable reliable high-performance contact formation. | |
dc.description.department | Erik Jonsson School of Engineering and Computer Science | |
dc.description.sponsorship | NSF Award 1407765; NIST through Award 70NANB17H041; European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement 713567 and a research grant from Science Foundation Ireland (SFI) under Grant SFI/12/RC/2278 | |
dc.identifier.bibliographicCitation | Smyth, Christopher M., Lee A. Walsh, Pavel Bolshakov, Massimo Catalano, et al. 2019. "Engineering the Palladium-WSe₂ Interface Chemistry for Field Effect Transistors with High-Performance Hole Contacts." ACSA Applied Nano Materials 2(1): 75-88, doi: 10.1021/acsanm.8b01708 | |
dc.identifier.issn | 2574-0970 | |
dc.identifier.issue | 1 | |
dc.identifier.uri | http://dx.doi.org/10.1021/acsanm.8b01708 | |
dc.identifier.uri | https://hdl.handle.net/10735.1/8839 | |
dc.identifier.volume | 2 | |
dc.language.iso | en | |
dc.publisher | Amer Chemical Soc | |
dc.rights | ©2018 American Chemical Society | |
dc.source.journal | ACS Applied Nano Materials | |
dc.subject | Tungsten(IV) Selenide | |
dc.subject | Palladium | |
dc.subject | Surface chemistry | |
dc.subject | X-ray photoelectron spectroscopy | |
dc.subject | Transistors | |
dc.subject | Molybdenum(IV) Sulfide | |
dc.subject | Resistance | |
dc.subject | Electrons | |
dc.subject | Molybdenum | |
dc.subject | Tungsten | |
dc.subject | Materials science | |
dc.title | Engineering The Palladium-WSe₂ Interface Chemistry for Field Effect Transistors with High-Performance Hole Contacts | |
dc.type.genre | article |
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