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Based on this approach, a simplified and robust protocol for the preparation of efficient electron\u2010transport layer (ETL)\u2010free perovskite solar cells is described. Power conversion efficiency (PCE) of 13.6\u2009% under AM\u20091.5\u2009G simulated sunlight is demonstrated for these devices. Comparative impedance spectroscopy and photostability analysis of the MAPbI<jats:sub>3<\/jats:sub>:C<jats:sub>70<\/jats:sub> and single MAPbI<jats:sub>3<\/jats:sub> films compared with conventional compact TiO<jats:sub>2<\/jats:sub> ETL\u2010based devices are shown. The beneficial impact of using MAPbI<jats:sub>3<\/jats:sub>:C<jats:sub>70<\/jats:sub> blend films is emphasized.<\/jats:p>","DOI":"10.1002\/cssc.201600940","type":"journal-article","created":{"date-parts":[[2016,8,24]],"date-time":"2016-08-24T08:07:26Z","timestamp":1472026046000},"page":"2679-2685","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":66,"title":["Electron Transport Layer\u2010Free Solar Cells Based on Perovskite\u2013Fullerene Blend Films with Enhanced Performance and Stability"],"prefix":"10.1002","volume":"9","author":[{"given":"Jorge","family":"Pascual","sequence":"first","affiliation":[{"name":"Materials Division, IK4-CIDETEC Parque Tecnol\u00f3gico de San Sebasti\u00e1n  Paseo Miram\u00f3n, 196 Donostia\u2013San Sebasti\u00e1n 20009 Spain"},{"name":"POLYMAT University of the Basque Country UPV\/EHU  Avenida de Tolosa 72 20018 Donostia\u2013San Sebasti\u00e1n Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivet","family":"Kosta","sequence":"additional","affiliation":[{"name":"Materials Division, IK4-CIDETEC Parque Tecnol\u00f3gico de San Sebasti\u00e1n  Paseo Miram\u00f3n, 196 Donostia\u2013San Sebasti\u00e1n 20009 Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"T.","family":"Tuyen\u2005Ngo","sequence":"additional","affiliation":[{"name":"Institute of Advanced Materials (INAM) University of Jaume I  Av. de Vicent Sos Baynat, s\/n 12006 Castell\u00f3 de la Plana Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrey","family":"Chuvilin","sequence":"additional","affiliation":[{"name":"CIC nanoGUNE Consolider  20018 Donostia\u2013San Sebasti\u00e1n Spain"},{"name":"Ikerbasque Basque Foundation for Science  48013 Bilbao Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"German","family":"Cabanero","sequence":"additional","affiliation":[{"name":"Materials Division, IK4-CIDETEC Parque Tecnol\u00f3gico de San Sebasti\u00e1n  Paseo Miram\u00f3n, 196 Donostia\u2013San Sebasti\u00e1n 20009 Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hans J.","family":"Grande","sequence":"additional","affiliation":[{"name":"Materials Division, IK4-CIDETEC Parque Tecnol\u00f3gico de San Sebasti\u00e1n  Paseo Miram\u00f3n, 196 Donostia\u2013San Sebasti\u00e1n 20009 Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eva M.","family":"Barea","sequence":"additional","affiliation":[{"name":"Institute of Advanced Materials (INAM) University of Jaume I  Av. de Vicent Sos Baynat, s\/n 12006 Castell\u00f3 de la Plana Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Iv\u00e1n","family":"Mora\u2010Ser\u00f3","sequence":"additional","affiliation":[{"name":"Institute of Advanced Materials (INAM) University of Jaume I  Av. de Vicent Sos Baynat, s\/n 12006 Castell\u00f3 de la Plana Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6948-8062","authenticated-orcid":false,"given":"Juan Luis","family":"Delgado","sequence":"additional","affiliation":[{"name":"POLYMAT University of the Basque Country UPV\/EHU  Avenida de Tolosa 72 20018 Donostia\u2013San Sebasti\u00e1n Spain"},{"name":"Faculty of Chemistry University of the Basque Country UPV\/EHU  P. 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