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Here, we report a solvent\u2010free additive polishing strategy using a synergistic combination of two\u2010dimensional (2D) graphene nanoplatelets and 3D graphite flakes to densify the hole\u2010transport\u2010layer (HTL)\/carbon interface by creating conformal van der Waals (vdW) anchors. This graphene\/graphite additive polishing process fills micro\u2010voids on the porous carbon electrode surface, reduces carbon electrode surface roughness, and creates a graphene anchor that increases interfacial fracture energy and promotes the carbon surface heating release. Electrically, the polished interface facilitates superior charge extraction, thereby reducing charge\u2010transfer resistance. Consequently, regular\n                    <jats:italic>n<\/jats:italic>\n                    \u2010\n                    <jats:italic>i<\/jats:italic>\n                    \u2010\n                    <jats:italic>p<\/jats:italic>\n                    perovskite solar devices achieve a promised power conversion efficiency (PCE) of 23.28% (0.09 cm\n                    <jats:sup>2<\/jats:sup>\n                    ) and maintain a high PCE of 19.62% at a scalable 1.0 cm\n                    <jats:sup>2<\/jats:sup>\n                    area. This work provides a high\u2010throughput, dry\u2010processing paradigm for more affordable, robust, and highly efficient carbon\u2010based perovskite photovoltaics.\n                  <\/jats:p>","DOI":"10.1002\/smll.74696","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T08:36:41Z","timestamp":1785141401000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Synergistic Graphene Polishing Enabling van der Waals Anchors for Efficient and Robust Carbon\u2010Based Perovskite Solar Cells"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9975-086X","authenticated-orcid":false,"given":"Kausar Ali","family":"Khawaja","sequence":"first","affiliation":[{"name":"Materials Science and Engineering Program School for Engineering of Matter, Transport and Energy Arizona State University  Tempe Arizona 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Electrical, Computer, and Energy Engineering Arizona State University  Tempe Arizona USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Li","sequence":"additional","affiliation":[{"name":"Materials Science and Engineering Program School for Engineering of Matter, Transport and Energy Arizona State University  Tempe Arizona USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0208-6886","authenticated-orcid":false,"given":"Feng","family":"Yan","sequence":"additional","affiliation":[{"name":"Materials Science and Engineering Program School for Engineering of Matter, Transport and Energy Arizona State University  Tempe Arizona 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