title: Photovoltaic Performance of Perovskite Solar Cells with Different Grain Sizes.
abstract: Perovskite solar cells exhibit improved photovoltaic parameters with increasing perovskite grain size. The larger photocurrent is due to the enhanced absorption efficiency for thicker perovskite layers. The larger open-circuit voltage (VOC ) is ascribed to the reduced trap-assisted recombination for the larger grains. As a result, the power conversion efficiency exceeds 19% at best. Further improvement in VOC would be possible if the trap density were reduced.
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.
authors.forename: Hyung Do
authors.initials: HD
authors.lastname: Kim
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.|Japan Science and Technology Agency (JST), PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Ohkita
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Benten
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.
authors.forename: Shinzaburo
authors.initials: S
authors.lastname: Ito
keywords: direct recombination; grain sizes; halide perovskites; open-circuit voltage; trap-assisted SRH recombination