title: Dry-Stamping-Transferred PC71BM Charge Transport Layer via an Interface-Controlled Polyurethane Acrylate Mold Film for Efficient Planar-Type Perovskite Solar Cells.
abstract: The study of interlayers is important to enhance the performance of inverted perovskite solar cells (PSCs) because interlayers in PSCs align energy levels and improve charge transport. However, previous research into applying interlayers for PSCs has focused only on wet-coated methods, such as spin coating, to form the interlayer. Here, we fabricated planar-type PSCs deposited with a 6,6-phenyl-C71butyric acid methyl ester (PC71BM) layer onto a CH3NH3PbI3(MAPbI3) layer by stamping transfer through a relatively dry process condition. We demonstrated the effects of a stamping-transferred PC71BM layer using polyurethane acrylate (PUA), the surface energy of which was modified by 2-hydroxyethyl methacrylate (HEMA) to increase the transfer reproducibility. In PSCs with a stamping-transferred PC71BM layer, we observed an enhanced JSCand a comparable power conversion efficiency (PCE), which were caused by an enhanced coverage of the electron transport layer onto the MAPbI3layer with preserved crystallinity, which occurs owing to improved electron mobility and exciton dissociation. The optimized device PCE through the dry-transferred PC71BM exhibited a JSC, fill factor, and PCE of 21.65 mA/cm2, 76.0%, and 15.46%, respectively. Moreover, morphological analysis and electrical measurements confirmed the improved durability of dry-stamping-transferred PSCs.
authors.affiliation: School of Integrative Engineering, Chung-Ang University , 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea.
authors.forename: Sunyong
authors.initials: S
authors.lastname: Ahn
authors.affiliation: School of Integrative Engineering, Chung-Ang University , 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea.
authors.forename: Woongsik
authors.initials: W
authors.lastname: Jang
authors.affiliation: School of Integrative Engineering, Chung-Ang University , 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea.
authors.forename: Soyun
authors.initials: S
authors.lastname: Park
authors.affiliation: School of Integrative Engineering, Chung-Ang University , 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea.
authors.forename: Dong Hwan
authors.identifier: http://orcid.org/0000-0003-3736-3721
authors.initials: DH
authors.lastname: Wang
keywords: charge-carrier dynamics; crystallinity; dry-stamping transfer; interface control; morphology; perovskite solar cells