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Title
Japanese: 
English:Surface Passivation of Lead Halide Perovskite Solar Cells by a Bifacial Donor–π–Donor Molecule 
Author
Japanese: Nanaki Minoi, 石割 文崇, Kazuharu Murotani, Ryosuke Nishikubo, 福島 孝典, Akinori Saeki.  
English: Nanaki Minoi, Fumitaka Ishiwari, Kazuharu Murotani, Ryosuke Nishikubo, Takanori Fukushima, Akinori Saeki.  
Language English 
Journal/Book name
Japanese: 
English:ACS Applied Materials & Interfaces 
Volume, Number, Page Vol. 15    Issue 5    Page 6708–6715
Published date Jan. 25, 2023 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
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Official URL https://pubs.acs.org/doi/10.1021/acsami.2c18446
 
DOI https://doi.org/10.1021/acsami.2c18446
Abstract Surface passivation is key to the power conversion efficiency (PCE) of organic–inorganic lead halide perovskite solar cells (PSCs). Herein, we report a novel molecular concept of a C2-symmetric syn-type bifacial donor−π–donor (D−π–D) passivation molecule (a racemic mixture of enantiomers) with hydrophobic phenyls and hydrophilic tetraethylene glycol-substituted phenyls on each face of the indeno-[1,2-b]fluorene π-core. In addition to this bifacial amphiphilic π-core unit, triphenylamine, a well-established passivation donor, effectively passivated the PSC surface, facilitated hole transfer, and increased the maximum PCE from 18.43 to 19.74%. Another notable effect is the removal of remnant PbI2 and the change in the perovskite orientation on the surface by the syn-type molecule. In contrast, the anti-type isomer degraded its long-term stability. We characterized the electrostatic and electronic properties of these molecules and highlighted the advantage of molecular strategy based on a bifacial structure and its stereochemistry.

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