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Here, we report an orientation\u2010engineered semitransparent Ta\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>5<\/jats:sub>\n                    photoanode enabled by two synergistic strategies. A homologous W\u2010incorporated Ta\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>5<\/jats:sub>\n                    semitransparent conductive layer is deposited on quartz glass, providing electronic compatibility with the Ta\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>5<\/jats:sub>\n                    absorber and favorable transmittance in the &gt;600\u00a0nm range. In parallel, Pt\u2010assisted lattice matching guides the preferential growth of Ta\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>5<\/jats:sub>\n                    with a high\u2010mobility (023) orientation. Theoretical and experimental analyses confirm that this (023)\u2010oriented architecture promotes charge separation and transport. The optimized photoanode delivers 9.7\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.23\u00a0V versus the reversible hydrogen electrode and a maximum applied\u2010bias photon\u2010to\u2010current efficiency of 3.47%. When integrated with a specially designed narrow\u2010bandgap perovskite solar cell, the tandem device achieves unbiased water splitting with a solar\u2010to\u2010hydrogen efficiency of 7.2%, representing one of the highest values reported for two\u2010photon tandem PEC water\u2010splitting systems. This work establishes a general strategy for coupling transparent conduction with crystallographic orientation control to advance efficient unassisted solar fuel production.\n                  <\/jats:p>","DOI":"10.1002\/adma.75072","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T10:02:59Z","timestamp":1790762579000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Orientation\u2010Engineered Semitransparent Ta\n                    <sub>3<\/sub>\n                    N\n                    <sub>5<\/sub>\n                    Photoanode for Unbiased Solar Water Splitting"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-6889-3291","authenticated-orcid":false,"given":"Beibei","family":"Zhang","sequence":"first","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiajun","family":"Ma","sequence":"additional","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haomin","family":"Hao","sequence":"additional","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shulong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Mechanical and Electrical Engineering Guang'an Institute of Technology  Guang'an Sichuan China"},{"name":"Institute For Advanced Study Chengdu University  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zeyu","family":"Fan","sequence":"additional","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronghua","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5058-2622","authenticated-orcid":false,"given":"Jialun","family":"Jin","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering &amp; Engineering Research Center of Alternative Energy Materials &amp; Devices Sichuan University  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4894-679X","authenticated-orcid":false,"given":"Yang","family":"Li","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering &amp; Engineering 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