title: Vertically aligned nanostructured TiO2 photoelectrodes for high efficiency perovskite solar cells via a block copolymer template approach.
abstract: We fabricated perovskite solar cells with enhanced device efficiency based on vertically oriented TiO2 nanostructures using a nanoporous template of block copolymers (BCPs). The dimension and shape controllability of the nanopores of the BCP template allowed for the construction of one-dimensional (1-D) TiO2 nanorods and two-dimensional (2-D) TiO2 nanowalls. The TiO2 nanorod-based perovskite solar cells showed a more efficient charge separation and a lower charge recombination, leading to better performance compared to TiO2 nanowall-based solar cells. The best solar cells employing 1-D TiO2 nanorods showed an efficiency of 15.5% with VOC = 1.02 V, JSC = 20.0 mA cm(-2) and fill factor = 76.1%. Thus, TiO2 nanostructures fabricated from BCP nanotemplates could be applied to the preparation of electron transport layers for improving the efficiency of perovskite solar cells.
authors.affiliation: Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea. mjko@kist.re.kr and Department of Chemistry, Seoul National University, Seoul 08826, Korea. bhsohn@snu.ac.kr.
authors.forename: Myung-Seok
authors.initials: MS
authors.lastname: Seo
authors.affiliation: Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea. mjko@kist.re.kr and Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk 37673, Korea.
authors.forename: Inyoung
authors.initials: I
authors.lastname: Jeong
authors.affiliation: Materials and Life Science Research Division, Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea.
authors.forename: Joon-Suh
authors.initials: JS
authors.lastname: Park
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk 37673, Korea.
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Lee
authors.affiliation: Materials and Life Science Research Division, Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea.
authors.forename: Il Ki
authors.initials: IK
authors.lastname: Han
authors.affiliation: Department of Chemistry and Chemical Engineering, Inha University, Incheon 22201, Korea.
authors.forename: Wan In
authors.initials: WI
authors.lastname: Lee
authors.affiliation: Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea. mjko@kist.re.kr.
authors.forename: Hae Jung
authors.initials: HJ
authors.lastname: Son
authors.affiliation: Department of Chemistry, Seoul National University, Seoul 08826, Korea. bhsohn@snu.ac.kr.
authors.forename: Byeong-Hyeok
authors.initials: BH
authors.lastname: Sohn
authors.affiliation: Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea. mjko@kist.re.kr and KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea.
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Ko