A Facile Preparative Route of Nanoscale Perovskites over Mesoporous Metal Oxide Films and Their Applications to Photosensitizers and Light Emitters. (1st August 2018)

• Record Type: Journal Article
• Authors: Lee, Hyo Joong; Cho, Kyung Taek; Paek, Sanghyun; Lee, Yonghui; Huckaba, Aron J.; Queloz, Valentin I. E.; Zimmermann, Iwan; Grancini, Giulia; Oveisi, Emad; Yoo, So‐Min; Lee, Seul‐Yi; Shin, Taeho; Kim, Myoung; Nazeeruddin, Mohammad Khaja
• Is Part Of: Advanced functional materials. Volume 28:Number 39(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-08-01
• Subjects: dye‐sensitized solar cells -- light emitters -- nanoscale perovskites -- sensitizers; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201803801
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: By two‐step sequential Pb 2+ adsorption and reaction with methylammonium‐iodide (MAI) or ‐bromide (MABr) at a low concentration level of 0.06–0.10m over mesoporous TiO2 or ZrO2 film, a well‐defined nanoscale CH3 NH3 PbI3 (MAPbI3 ) photosensitizer or CH3 NH3 PbBr3 (MAPbBr3 ) light emitter could be prepared in situ, respectively in a reproducible and atom‐economical way. The as‐prepared nanoscale perovskites are compared with their thin film counterparts in terms of light absorption/emission, crystallinity, surface morphology, and energy‐conversion efficiency. The nanoscale perovskite‐decorated films display more transparency than the bulky film due to the much lower amount deposited, while blueshifted and overwhelmingly brighter photoluminescence is observed in the "nano" relative to the "bulk" due to quantum size confinement. Transmission electron microscopy images also clearly show that a few nanometer‐sized perovskite dots are deposited homogeneously over the surface of TiO2 ‐ or ZrO2 ‐particulate film in the course of the current preparative route. When the nano‐MAPbI3 is tested as a photosensitizer in a solid‐state dye‐sensitized solar cell configuration with a very thin (≈ 650 nm) TiO2 mesoporous film, it has a promising initial power conversion efficiency of 6.23%, which outperformed the result of 2.28% from a typical organic molecular dye coded as MK‐2. Abstract : A nanoscale MAPbI3 photosensitizer and MAPbBr3 light emitter are prepared in situ over mesoporous metal oxide films by two‐step sequential Pb 2+ adsorption and reaction with methylammonium‐iodide or ‐bromide at a reasonably low concentration level of precursors. The as‐formed nanoscale perovskites are compared with their thin film counterparts.