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Although symmetric 2D materials often face a trade-off between suppressing FLP and preserving carrier injection efficiency, symmetry-broken Janus structures provide a structural route to overcome this limitation. Here, using first-principles density functional theory calculations, we systematically investigate the interfacial coupling in Metal\/Janus-MoSSe junctions. For conventional metal contacts, stronger FLP is found on the S-face than on the Se-face. Strikingly, this face-dependent pinning asymmetry is reversed upon replacing the conventional metals with 2D metallic vdW contacts: the SMoSe contact then approaches the Schottky\u2013Mott limit much more closely, owing to suppressed chemical interactions and metal-induced gap states. This polarity-driven, face-dependent reversal introduces a new physical degree of freedom for designing high-performance, directionally tunable 2D FETs with tailorable contact properties.<\/jats:p>","DOI":"10.1088\/1361-6528\/aeae48","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T22:49:11Z","timestamp":1790808551000},"page":"415702","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Face-dependent Schottky barrier modulation and asymmetric pinning at Metal\/Janus-MoSSe contacts: a first-principles study"],"prefix":"10.1088","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6407-571X","authenticated-orcid":true,"given":"Yuchen","family":"Liu","sequence":"first","affiliation":[{"name":"College of Transportation and Electrical Engineering, Hunan University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-3663-9648","authenticated-orcid":true,"given":"Jin","family":"Xiao","sequence":"additional","affiliation":[{"name":"College of Transportation and Electrical Engineering, Hunan University of Technology"},{"name":"School of Science, Hunan University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"He","sequence":"additional","affiliation":[{"name":"School of Science, Hunan University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liling","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Science, Hunan University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Science, Hunan University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,10,12]]},"reference":[{"key":"nanoaeae48bib1","doi-asserted-by":"publisher","first-page":"147","DOI":"10.1038\/nnano.2010.279","type":"journal-article","volume":"6","author":"Radisavljevic","year":"2011","journal-title":"Nat. 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