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Conventional wide\u2010bandgap perovskites, typically FA\n                    <jats:sub>1\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    Cs\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    MA\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    PbI\n                    <jats:sub>1\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    Br\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    , contain volatile methylammonium (MA) components and mixed halides that compromise device stability and performance. Removing MA to form FA\n                    <jats:sub>1\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    Cs\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    PbI\n                    <jats:sub>1\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    Br\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    eliminates volatile organic components; however, the absence of MA and high Br content required for bandgap widening inevitably accelerates crystallization, increases defect density, and induces severe voltage losses. Here, we present a coupled bulk\u2013surface regulation strategy that fundamentally overcomes these intrinsic bottlenecks. Incorporation of homopiperidinic acid hydroiodide into the precursor heals bulk lattice defects via \u2500COOH\u2500Pb\n                    <jats:sup>2+<\/jats:sup>\n                    coordination and suppresses halide migration through N\u2500H\u2026I\u2013 hydrogen bonding, while subsequent treatment with trimethylenediamine dihydroiodide salts neutralizes surface unsaturated Pb\n                    <jats:sup>2+<\/jats:sup>\n                    and halide vacancies through amino\u2010Pb\n                    <jats:sup>2+<\/jats:sup>\n                    coordination, hydrogen bonding, and electrostatic interactions. Their coupling effect precisely suppresses defect formation, minimizes non\u2010radiative recombination, and critically stabilizes halide distribution. As a result, the wide\u2010bandgap perovskite solar cells achieve an efficiency of 23.71% and enhanced operational stability with T\n                    <jats:sub>92<\/jats:sub>\n                    exceeding 1000\u00a0h. Integrated into silicon tandem devices, they deliver 32.26% with long\u2010term durability. This work establishes molecular coupling consolidation as a new paradigm for constructing stable, high\u2010efficiency, MA\u2010free wide\u2010bandgap perovskites, advancing the practical realization of reliable tandem photovoltaics.\n                  <\/jats:p>","DOI":"10.1002\/advs.202520950","type":"journal-article","created":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T09:09:58Z","timestamp":1767604198000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Integrated Bulk\u2013Surface Engineering Stabilizes MA\u2010Free Wide\u2010Bandgap Perovskites for Tandem Photovoltaics"],"prefix":"10.1002","volume":"13","author":[{"given":"Yu","family":"Tong","sequence":"first","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials Joint International Research Laboratory of Carbon\u2010Based Functional Materials and Devices Soochow University  Suzhou P. R. 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