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This is achieved by incorporating a P3HT<jats:sub>50<\/jats:sub>\u2010<jats:italic>b<\/jats:italic>\u2010PSS<jats:sub>x<\/jats:sub> block copolymer as an interfacial layer between the hole transporting and photoactive layers, which results in the improvement of the interfacial roughness, energy level alignment, and stability between these layers. Specifically, the incorporation of a 10\u00a0nm P3HT<jats:sub>50<\/jats:sub>\u2010<jats:italic>b<\/jats:italic>\u2010PSS<jats:sub>16<\/jats:sub> and a 13\u00a0nm P3HT<jats:sub>50<\/jats:sub>\u2010<jats:italic>b<\/jats:italic>\u2010PSS<jats:sub>23<\/jats:sub> interfacial layer results in a 9% and a 12% increase in device efficiency respectively compared to the reference devices. In addition to having a higher initial efficiency, the devices with the block copolymer continue to have a higher normalized efficiency than the control devices after 2200 h of storage, demonstrating that the block copolymer not only improves device efficiency, but crucially, prevents degradation by stabilizing the interface between the hole transporting layer and the photoactive layer. This study proves that appropriately designed and optimized block copolymers can simultaneously stabilize and improve the efficiency of organic solar cells.<\/jats:p>","DOI":"10.1002\/admi.202000918","type":"journal-article","created":{"date-parts":[[2020,8,3]],"date-time":"2020-08-03T02:02:29Z","timestamp":1596420149000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Improved Performance and Stability of Organic Solar Cells by the Incorporation of a Block Copolymer Interfacial Layer"],"prefix":"10.1002","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3150-8467","authenticated-orcid":false,"given":"Gabriel E.","family":"P\u00e9rez","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Sheffield  Sheffield S1 3JD UK"}]},{"given":"Harikrishna","family":"Erothu","sequence":"additional","affiliation":[{"name":"Centre for Advanced Energy Studies (CAES) Koneru Lakshmaiah Education Foundation (KLEF)  Green Fields, Vaddeswaram Guntur Andhra Pradesh 522 502 India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4152-6976","authenticated-orcid":false,"given":"Paul D.","family":"Topham","sequence":"additional","affiliation":[{"name":"Aston Institute of Materials Research Aston University  Birmingham B7 4AG UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5794-0544","authenticated-orcid":false,"given":"Francesco","family":"Bastianini","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Sheffield  Sheffield S1 3JD UK"}]},{"given":"Tarek I.","family":"Alanazi","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy University of Sheffield  Sheffield S3 7RH UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7392-4915","authenticated-orcid":false,"given":"Gabriel","family":"Bernardo","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering, Environment, Biotechnology and Energy Faculty of Engineering University of Porto  Porto 4200\u2010465 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8606-8644","authenticated-orcid":false,"given":"Andrew J.","family":"Parnell","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy University of Sheffield  Sheffield S3 7RH UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3386-9151","authenticated-orcid":false,"given":"Stephen M.","family":"King","sequence":"additional","affiliation":[{"name":"ISIS Pulsed Neutron and Muon Source STFC Rutherford Appleton Laboratory  Didcot OX11 0QX UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2313-4234","authenticated-orcid":false,"given":"Alan D. 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