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Recently, MXenes\u20132D structured transition metal carbides and nitrides with various functionalization (\uf8feO, \u2010F, \u2010OH) have demonstrated high potential for mastering the work function in halide perovskite absorbers and have significantly improved the n\u2010type charge collection in solar cells. This work demonstrates that MXenes allow for efficient stabilization of PSCs besides improving their performances. A mixed composite bathocuproine:MXene, that is, (BCP:MXene) interlayer, is introduced at the interface between an electron\u2010transport layer (ETL) and a metal cathode in the p\u2010i\u2010n device structure. The investigation demonstrates that the use of BCP:MXene interlayer slightly increases the power conversation efficiency (PCE) for PSCs (from 16.5 for reference to 17.5%) but dramatically improves the out of Glove\u2010Box stability. Under ISOS\u2010L\u20102 light soaking stress at 63 \u00b1 1.5\u00a0\u00b0C, the T80 (time needed to reduce efficiency down to 80% of the initial one) period increases from 460\u00a0to &gt; 2300\u00a0hours (h).<\/jats:p>","DOI":"10.1002\/smll.202201730","type":"journal-article","created":{"date-parts":[[2022,8,12]],"date-time":"2022-08-12T05:43:55Z","timestamp":1660283035000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Photo Stabilization of p\u2010i\u2010n Perovskite Solar Cells with Bathocuproine: MXene"],"prefix":"10.1002","volume":"18","author":[{"given":"Anastasia","family":"Yakusheva","sequence":"first","affiliation":[{"name":"LASE \u2013 Laboratory of Advanced Solar Energy National University of Science and Technology \u201cMISiS\u201d  Leninsky prospect 4 Moscow 119049 Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9617-9986","authenticated-orcid":false,"given":"Danila","family":"Saranin","sequence":"additional","affiliation":[{"name":"LASE \u2013 Laboratory of Advanced Solar Energy National University of Science and Technology \u201cMISiS\u201d  Leninsky prospect 4 Moscow 119049 Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2027-4311","authenticated-orcid":false,"given":"Dmitry","family":"Muratov","sequence":"additional","affiliation":[{"name":"LASE \u2013 Laboratory of Advanced Solar Energy National University of Science and Technology \u201cMISiS\u201d  Leninsky prospect 4 Moscow 119049 Russia"},{"name":"Department of Functional Nanomaterials and High\u2010Temperature Materials National University of Science and Technology \u201cMISiS\u201d  Leninsky prospect 4 Moscow 119049 Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8882-4917","authenticated-orcid":false,"given":"Pavel","family":"Gostishchev","sequence":"additional","affiliation":[{"name":"LASE \u2013 Laboratory of Advanced Solar Energy National University of Science and Technology \u201cMISiS\u201d  Leninsky prospect 4 Moscow 119049 Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0592-9009","authenticated-orcid":false,"given":"Hanna","family":"Pazniak","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Grenoble Alpes CNRS Grenoble INP LMGP  3 parvis Louis N\u00e9el Grenoble 38016 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4774-3488","authenticated-orcid":false,"given":"Alessia","family":"Di Vito","sequence":"additional","affiliation":[{"name":"C.H.O.S.E. 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