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Herein, a multifunctional guanidine derivative of N\u2010(3\u2010methoxy\u2010phenyl)\u2010guanidine (NMPG), is used to modify the buried interface between the CsSnI\n                    <jats:sub>3<\/jats:sub>\n                    perovskite and the HTL. NMPG deprotonates the polystyrene sulfonic acid (PSSH) of PSS and reduces the acidity of PEDOT:PSS, while its methoxy and C\u2550N groups coordinate with Sn\n                    <jats:sup>2+<\/jats:sup>\n                    , effectively inhibiting Sn\n                    <jats:sup>2+<\/jats:sup>\n                    oxidation, passivating Sn (II) induced defects. This customized buried interface enables uniform and discrete growth of perovskite grain, improves charge injection balance, and enhances vertical compositional and optical homogeneity. As a result, the target PeLEDs achieve a competitive maximum external quantum efficiency (EQE) of 9.0% and a high average EQE of 8.4%, significantly outperforming the control device (\n                    <jats:italic>EQE<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    = 6.6%,\n                    <jats:italic>EQE<\/jats:italic>\n                    <jats:sub>ave<\/jats:sub>\n                    = 5.5%). The target PeLEDs also demonstrate superior operational stability, with a T\n                    <jats:sub>50<\/jats:sub>\n                    lifetime of 67.9 h, representing a 5\u2010fold improvement compared to the control PeLEDs. This work reveals the pivotal role of buried interface chemistry and presents a viable molecular design strategy for achieving high\u2010performance CsSnI\n                    <jats:sub>3<\/jats:sub>\n                    \u2010based PeLEDs.\n                  <\/jats:p>","DOI":"10.1002\/adma.75220","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T01:07:21Z","timestamp":1790816841000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Customized Buried Interface for High Performance All\u2010Inorganic CsSnI\n                    <sub>3<\/sub>\n                    \u2010Based NIR Perovskite Light\u2010Emitting Diodes via a Guanidinium Derivative"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8440-2060","authenticated-orcid":false,"given":"Xiuling","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Fundamental and Frontier Sciences 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