Recently,there has been renewed interest in interface engineering as a means to further push the perfor-mance of perovskite solar cells closer to the Schockly-Queisser limit.Herein,for the first time we employ a multi-functional 4-chlorobenzoic acid to produce a self-assembled monolayer on a perovskite surface.With this interlayer we observe passivation of perovskite surface defects and a significant suppression of non-radiative charge recombination.Furthermore,at the surface of the interlayer we observe,charge dipoles which tune the energy level alignment,enabling a larger energetic driving force for hole extrac-tion.The perovskite surface becomes more hydrophilic due to the presence of the interlayer.Consequently,we observe an improvement in open-circuit voltage from 1.08 to 1.16 V,a power conver-sion efficiency improvement from 18％ to 21％ and an improved stability under ambient conditions.Our work highlights the potential of SAMs to engineer the photo-electronic properties and stability of per-ovskite interfaces to achieve high-performance light harvesting devices.

Ge Wang;Chen Wang;Yajun Gao;Shanpeng Wen;Roderick C.I.MacKenzie;Liuxing Guo;Wei Dong;Shengping Ruan

College of Electronic Science & Engineering,Jilin University,Changchun 130012,Jilin,China;State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun 130012,Jilin,China;KAUST Solar Center (KSC),Physical Sciences and Engineering Division (PSE),King Abdullah University of Science and Technology (KAUST),Thuwal23955-6900,Saudi Arabia;Faculty of Engineering,The University of Nottingham,University Park,Nottingham NG72RD,United Kingdom;State Key Laboratory on Integrated Optoelectronics,Jilin University,Changchun 130012,Jilin,China

能源化学

[1]Ge Wang;Chen Wang;Yajun Gao;Shanpeng Wen;Roderick C.I.MacKenzie;Liuxing Guo;Wei Dong;Shengping Ruan-.Passivation agent with dipole moment for surface modification towards efficient and stable perovskite solar cells)[J].能源化学,2022(01):55-61

Schockly,chlorobenzoic

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