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However, the self\u2010assembled monolayer (SAM) generally leads to poor contact due to the weak intermolecular interactions. Here, an effective co\u2010assembly monolayer method is reported by incorporating acetyl dl\u2010carnitine chloride (ACL) into [4\u2010(3,6\u2010dimethyl\u20109H\u2010carbazol\u20109yl) butyl] phosphonic acid (Me\u20104PACz) ethanol solution. The application of the ACL improves the coverage of SAM and simultaneously enhances the chemical bonding at the buried interface. As a result, the perovskite solar cells achieve a power conversion efficiency of 25.78% under simulated AM1.5 light conditions, maintaining more than 90% of their original efficiency after \u2248600 h of operation at peak power.<\/jats:p>","DOI":"10.1002\/smll.202504930","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T11:30:31Z","timestamp":1752233431000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Enhancing Chemical Bonding at Buried Interface Enables Improved Performance of Perovskite Solar Cell"],"prefix":"10.1002","volume":"21","author":[{"given":"Sicen","family":"Zhou","sequence":"first","affiliation":[{"name":"School of Physics and Materials Science &amp; Jiangxi Provincial Key Laboratory of Photodetectors Nanchang University  999 Xuefu Avenue Nanchang 330031 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hepeng","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuqing","family":"Luo","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhouti","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiqing","family":"Ding","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuecheng","family":"Hu","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiangsheng","family":"Xie","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4308-7022","authenticated-orcid":false,"given":"Tianbao","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Physics and Materials Science &amp; Jiangxi Provincial Key Laboratory of Photodetectors Nanchang University  999 Xuefu Avenue Nanchang 330031 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pingqi","family":"Gao","sequence":"additional","affiliation":[{"name":"Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Sun Yat\u2010sen University  Shenzhen Guangdong 518107 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,7,11]]},"reference":[{"key":"e_1_2_6_1_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adr2091"},{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adq8385"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202500708"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/aenm.202303742"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adj9602"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2024.05.005"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.ade9637"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adg3755"},{"key":"e_1_2_6_9_1","volume":"64","author":"Zhang X.","year":"2025","journal-title":"Angew. 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