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Standard crystallographic models fall short of capturing the temperature\u2010dependent stacking disorder and multiplet excitonic features in these systems. Here, we introduce a four\u2010dimensional superspace framework, employing a phenomenological atomic modulation function, to describe the symmetry\u2010breaking interactions in Ruddlesden\u2013Popper\u00a0L\n                    <jats:sub>2<\/jats:sub>\n                    FA\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>\u20101<\/jats:sub>\n                    [Sn\n                    <jats:sub>0.022<\/jats:sub>\n                    Pb\n                    <jats:sub>0.978<\/jats:sub>\n                    ]\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    I\n                    <jats:sub>3<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>n<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>+1<\/jats:sub>\n                    (L: oleylamine,\n                    <jats:italic>n<\/jats:italic>\n                    \u2265 2) nanoplatelet superlattices. Temperature\u2010tunable optical spectra reveal microcavity\u2010like excitonic confinement, while ultrafast transient absorption spectroscopy uncovers sub\u2010picosecond energy funneling through modulated quantum wells, facilitating a measurable and stable self\u2010powered photoresponse across a broad spectral range at room temperature. A rare coexistence of negative thermal expansion and quenching arises from anisotropic octahedral distortions and electron\u2013phonon interactions. These findings establish a new structure\u2010function paradigm for designing thermally reconfigurable optoelectronic materials via engineered lattice modulation in hybrid perovskite superstructures.\n                  <\/jats:p>","DOI":"10.1002\/adma.74826","type":"journal-article","created":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T03:49:37Z","timestamp":1787975377000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Superspace Architecture\u2010Driven Energy Funneling in Layered Halide Perovskite Nanoplatelets"],"prefix":"10.1002","volume":"38","author":[{"given":"Vishwadeepa","family":"Hazra","sequence":"first","affiliation":[{"name":"Department of Chemical Sciences and Centre for Advanced Functional Materials Indian Institute of Science Education and Research (IISER) Kolkata  Mohanpur 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