title: Hexagonal β-NaYF4:Yb(3+), Er(3+) Nanoprism-Incorporated Upconverting Layer in Perovskite Solar Cells for Near-Infrared Sunlight Harvesting.
abstract: Hexagonal β-NaYF4:Yb(3+), Er(3+) nanoprisms, successfully prepared using a hydrothermal method, were incorporated into CH3NH3PbI3 perovskite solar cells (PSCs) as an upconverting mesoporous layer. Due to their near-infrared (NIR) sunlight harvesting, the PSCs based on the upconverting mesoporous layer exhibited a power conversion efficiency of 16.0%, an increase of 13.7% compared with conventional TiO2 nanoparticle-based PSCs (14.1%). This result suggests that the hexagonal β-NaYF4:Yb(3+), Er(3+) nanoprisms expand the absorption range of the PSC via upconversion photoluminescence, leading to an enhancement of the photocurrent.
authors.affiliation: School of Chemical and Biological Engineering, College of Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Jongmin
authors.initials: J
authors.lastname: Roh
authors.affiliation: School of Chemical and Biological Engineering, College of Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Haejun
authors.initials: H
authors.lastname: Yu
authors.affiliation: School of Chemical and Biological Engineering, College of Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang
keywords: Er3+; NaYF4:Yb3+; nanoprism; perovskite solar cell; upconversion