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DSSCs using [Co(bpy)<jats:sub>3<\/jats:sub>]<jats:sup>2<\/jats:sup><jats:sup>+<\/jats:sup><jats:sup>\/3+<\/jats:sup> redox mediators often face stability challenges due to light\u2013induced interaction with <jats:italic>tert<\/jats:italic>\u2010butylpyridine (TBP), an electrolyte additive. This leads to the loss of electrochemically active mediators and degradation of the photovoltaic performance. However, the monolithic DSSCs in this work demonstrate unprecedented stability under continuous light soaking for over 1000\u2009h. The stability is attributed to the device architecture and the carbon CE, which mitigate critical degradation mechanisms. Additionally, its adsorption capacity and opacity reduce the amount of free TBP in the electrolyte, thereby suppressing harmful photoinduced [Co(bpy)<jats:sub>3<\/jats:sub>]\u00b3<jats:sup>+<\/jats:sup>\u2010TBP complexation and water\u2010induced redox reactions. Despite high TBP concentrations (1.2\u2009M), which typically accelerate degradation in conventional DSSCs, the monolithic devices maintained their performance due to electrolyte retention and reduced ion diffusion within the porous carbon layer. This study highlights the critical role of architecture in stabilizing cobalt\u2010mediated DSSCs, paving the way for robust, long\u2010term energy conversion applications.<\/jats:p>","DOI":"10.1002\/solr.202500310","type":"journal-article","created":{"date-parts":[[2025,6,27]],"date-time":"2025-06-27T10:10:31Z","timestamp":1751019031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Highly Stable Dye\u2010Sensitized Solar Cell using Cobalt Tris(Bipyridyl) Complexes Via Monolithic Architecture"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7615-7694","authenticated-orcid":false,"given":"Jorge","family":"Martins","sequence":"first","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process, Environment, Biotechnology and Energy, Department of Chemical Engineering Faculty of Engineering University of Porto  Porto Portugal"},{"name":"ALiCE \u2010 Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto  Porto Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4913-3798","authenticated-orcid":false,"given":"Ana M. 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