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However, translating such rationally designed heterostructures into scalable, high\u2010performance photoanodes remains a critical bottleneck for conventional fabrication methods. Here, we develop an aerosol\u2010jet printing (AJP) approach to fabricate S\u2010scheme SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    \/g\u2010C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    heterojunction photoanodes with well\u2010controlled stacking sequences. The interfacial built\u2011in electric field drives recombination of SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    photogenerated electrons with g\u2011C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    holes, preserving the strongly oxidizing holes in SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    for the oxygen evolution reaction (OER). The SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    \u2010on\u2010C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    configuration delivers enhanced PEC water oxidation activity, with a photocurrent density of 2.3\u00a0mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , double that of single\u2010component and reversed\u2010structure photoanodes. It is found that this enhancement stems from stacking\u2010order\u2010dependent synergy between the heterojunction built\u2010in electric field and semiconductor\u2010electrolyte band bending. Notably, AJP enables fabrication of large\u2010area, module\u2010sized photoanodes, demonstrating practical scalability for device manufacturing. This work provides a controllable, scalable route for the rational design of high\u2010performance S\u2010scheme heterojunction photoelectrodes for PEC water splitting.\n                  <\/jats:p>","DOI":"10.1002\/smll.76307","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T10:45:27Z","timestamp":1792061127000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Spatially Programmable S\u2010Scheme Heterojunction Photoanodes via Aerosol\u2010Jet Printing for Efficient Solar Water Oxidation"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6067-2616","authenticated-orcid":false,"given":"Xiaoli","family":"Ran","sequence":"first","affiliation":[{"name":"Key Laboratory For Ecological Metallurgy of Multimetallic Mineral School of Metallurgy Ministry of Education Northeastern University  Shenyang China"},{"name":"Engineering Research Center of Frontier 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