title: Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells.
abstract: In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous TiO2(m-TiO2) matrix, highly efficient solar cells with power conversion efficiency values up to 19.54 % were realized. In addition, the boosted beneficial role of rGO with and without Li-treated m-TiO2is highlighted, improving transport and injection of photoexcited electrons. This combined system may pave the way for further development and optimization of electron transport and collection in high efficiency PSCs.
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion, CH-1951, Switzerland.
authors.forename: Kyung Taek
authors.initials: KT
authors.lastname: Cho
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion, CH-1951, Switzerland.
authors.forename: Giulia
authors.initials: G
authors.lastname: Grancini
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion, CH-1951, Switzerland.
authors.forename: Yonghui
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Center of Materials Technology and Photonics & Electrical Engineering Department School of Applied Technology, Technological Educational Institute (T.E.I) of Crete Heraklion, 71 004, Crete, Greece.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Konios
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion, CH-1951, Switzerland.
authors.forename: Sanghyun
authors.initials: S
authors.lastname: Paek
authors.affiliation: Center of Materials Technology and Photonics & Electrical Engineering Department School of Applied Technology, Technological Educational Institute (T.E.I) of Crete Heraklion, 71 004, Crete, Greece.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Kymakis
authors.affiliation: Group for Molecular Engineering of Functional Materials, Institute of chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Sion, CH-1951, Switzerland.|Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Mohammad Khaja
authors.identifier: http://orcid.org/0000-0001-5955-4786
authors.initials: MK
authors.lastname: Nazeeruddin
mesh_terms: D017610:Calcium Compounds; D004579:Electron Transport; D004583:Electrons; D004736:Energy-Generating Resources; D006108:Graphite / Q000737:chemistry*; D010087:Oxides; D012993:Solar Energy; D014025:Titanium
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D006108:Graphite; D014025:Titanium
keywords: active interface; charge transfer dynamics; hybrid perovskite; perovskite solar cells; reduced graphene oxide