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However, systematic transport studies of intercalated graphene have been hindered by challenges in device fabrication, including processing\u2010induced deintercalation and instability under standard lithographic techniques. Here, a lithographically controlled intercalation approach is introduced that enables the scalable fabrication of gallium\u2010intercalated quasi\u2010freestanding bilayer graphene (QFBLG) Hall bar devices. By integrating lithographic structuring with subsequent intercalation through dedicated intercalation channels, this method ensures precise control over metal incorporation while preserving device integrity. Magnetotransport measurements reveal superconductivity with a critical temperature \u2248 3.5 K and the occurrence of a transverse resistance, including both symmetric and antisymmetric field components, which is attributed to the symmetric\u2010in\u2010field component of non\u2010uniform currents. These results establish an advanced fabrication method for intercalated graphene devices, providing access to systematic investigations of confined 2D superconductivity and emergent electronic phases in van der Waals heterostructures.<\/jats:p>","DOI":"10.1002\/adma.202511992","type":"journal-article","created":{"date-parts":[[2025,10,31]],"date-time":"2025-10-31T07:10:24Z","timestamp":1761894624000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Lithographically Controlled Liquid Metal Diffusion in Graphene: Fabrication and Magnetotransport Signatures of Superconductivity"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4811-1239","authenticated-orcid":false,"given":"Stefan","family":"Wundrack","sequence":"first","affiliation":[{"name":"Physikalisch\u2010Technische Bundesanstalt  Bundesallee 100 38116 Braunschweig Germany"},{"name":"Institut f\u00fcr Halbleitertechnik 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