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Compounds released by the perovskite as byproducts of interfacial electrochemistry can react with and compromise various LED layers and diminish performance, particularly corroding and degrading metal anodes. In this study, we use a mixed\u2010polymer hole transport layer (a mixture of poly(N,N'\u2010bis\u20104\u2010butylphenyl\u2010N,N'\u2010bisphenyl)benzidine (polyTPD) and poly(9\u2010vinylcarbazole) (PVK)) to stabilize methylammonium lead iodide\u2010based PeLEDs with Au metal anodes against increasing leakage current under repeated operation and decreased emission intensity under constant driving. We study this layer using a newly developed Au\u2010corrosion\u2010based triiodide detection experiment to determine that our mixed hole transport layer interferes with and inhibits triiodide transport, leading to more stable operation.<\/jats:p>","DOI":"10.1002\/advs.76051","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T07:56:43Z","timestamp":1781164603000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mixed\u2010Polymer Hole Transport Layers Reinforce Au\u2010Anode Top Emitting Perovskite Light Emitting Diodes"],"prefix":"10.1002","volume":"13","author":[{"given":"James C.","family":"Loy","sequence":"first","affiliation":[{"name":"Department of Physics Princeton University  Princeton New Jersey USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jisu","family":"Hong","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer 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