title: Continuous Size Tuning of Monodispersed ZnO Nanoparticles and Its Size Effect on the Performance of Perovskite Solar Cells.
abstract: ZnO has been demonstrated to be a promising candidate to fabricate high efficiency perovskite solar cells (PSCs) in terms of its better electron extraction and transport properties. However, the inability of synthesis of ZnO nanoparticles (NPs) with minimal surface defects and agglomeration remains a great challenge hindering the fabrication of highly efficient PSCs. In this work, highly crystalline and agglomeration-free ZnO NPs with controlled size were synthesized through a facile solvothermal method. Such ZnO NPs were applied in the fabrication of meso-structured PSCs. The solar cells with ∼40 nm ZnO NPs exhibit the highest power conversion efficiency (PCE) of 15.92%. Steady-state and time-resolved photoluminescence measurements revealed the faster injection and lower charge recombination at the interface of ∼40 nm ZnO NPs and perovskite, resulting in significantly enhanced JSCand VOC.
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST) , Beijing 100083, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST) , Beijing 100083, China.
authors.forename: Chengbin
authors.initials: C
authors.lastname: Fei
authors.affiliation: Advanced Material and Technology Institute, University of Science and Technology , Beijing 100083, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST) , Beijing 100083, China.
authors.forename: Haoyu
authors.initials: H
authors.lastname: Fu
authors.affiliation: Advanced Material and Technology Institute, University of Science and Technology , Beijing 100083, China.
authors.forename: Jianjun
authors.identifier: http://orcid.org/0000-0002-4008-0469
authors.initials: J
authors.lastname: Tian
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST) , Beijing 100083, China.|Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States.
authors.forename: Guozhong
authors.identifier: http://orcid.org/0000-0003-1498-4517
authors.initials: G
authors.lastname: Cao
keywords: ZnO nanoparticles; electron transport; monodisperse; perovskite solar cells; size effect