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However, their practical application remains constrained by the scarcity of single materials that can combine low symmetry with high performance. Here, we report a novel low\u2010symmetry [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]SO\n 4<\/jats:sub>\n crystal with an insulating nature, designed to enable symmetry control over conventional high\u2010performance semiconductors. We achieve controllable growth of layered [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]SO\n 4<\/jats:sub>\n nanosheets via a gradient\u2010mass\u2010transfer\u2010assisted chemical vapor deposition method, with thicknesses down to 1.43\u00a0nm. Alternating [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]\n 2+<\/jats:sup>\n cationic layers and SO\n 4<\/jats:sub>\n 2\u2212<\/jats:sup>\n anionic layers, coupled with disparate ionic radii of Bi\n 3+<\/jats:sup>\n and Cu\n 2+<\/jats:sup>\n , endow the [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]SO\n 4<\/jats:sub>\n material with low structural symmetry, resulting in pronounced in\u2010plane optical anisotropy. Upon integration with high\u2010symmetry MoS\n 2<\/jats:sub>\n , [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]SO\n 4<\/jats:sub>\n induces interfacial symmetry breaking, driven by strong interfacial coupling and substantial charge redistribution. Notably, by fabricating devices along different crystallographic orientations of [Bi\n 2<\/jats:sub>\n CuO\n 3<\/jats:sub>\n ]SO\n 4<\/jats:sub>\n , tunable polarization ratios are exhibited, reaching a maximum of 5.44 along the\n a<\/jats:italic>\n \u2010axis and a minimum of 1.57 along the\n b<\/jats:italic>\n \u2010axis. This work establishes a reliable strategy for obtaining heterostructures with low symmetry and tunable anisotropy, advancing next\u2010generation directional optoelectronic devices.\n <\/jats:p>","DOI":"10.1002\/adma.74908","type":"journal-article","created":{"date-parts":[[2026,9,5]],"date-time":"2026-09-05T17:17:36Z","timestamp":1788628656000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Gradient\u2010Mass\u2010Transfer Synthesis of 2D [Bi\n 2<\/sub>\n CuO\n 3<\/sub>\n ]SO\n 4<\/sub>\n Crystals for Anisotropy Engineering"],"prefix":"10.1002","author":[{"given":"Qiao","family":"Meng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Materials for Intelligent Sensing Ministry of Science and Technology & Key Laboratory of Organic Integrated Circuit Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin P. 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