title: Selective Deposition of Insulating Metal Oxide in Perovskite Solar Cells with Enhanced Device Performance.
abstract: We report a simple methodology for the selective deposition of an insulating layer on the nanoparticulate TiO2 (np-TiO2) mesoporous layer of perovskite solar cells. The deposited MgO insulating layer mainly covered the bottom part of the np-TiO2 layer with less coverage at the top. The so-called quasi-top-open structure is introduced to act as an efficient hole-blocking layer to prevent charge recombination at the physical contact of the transparent conducting oxide with the perovskite. This leads to an open-circuit voltage higher than that of the reference cell with a compact TiO2 hole-blocking layer. Moreover, such a quasi-top-open structure can facilitate the electron injection from perovskite into the np-TiO2 mesoporous layer and improve the spectral response at longer wavelength because of the less covered insulating layer at the top. This work provides an alternative way to fabricate perovskite solar cells without the need to use a conventional compact TiO2 layer.
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan).
authors.forename: Youfeng
authors.initials: Y
authors.lastname: Yue
authors.affiliation: State Key Laboratory of Metal Matrix Composites. Shanghai Jiao Tong University, 2800 Dong Chuan Rd., Minhang District, Shanghai 200240 (PR China). yang.xudong@sjtu.edu.cn.
authors.forename: Xudong
authors.initials: X
authors.lastname: Yang
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan).
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan).
authors.forename: Noviana Tjitra
authors.initials: NT
authors.lastname: Salim
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan).
authors.forename: Ashraful
authors.initials: A
authors.lastname: Islam
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan).
authors.forename: Takeshi
authors.initials: T
authors.lastname: Noda
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan). han.liyuan@nims.go.jp.|State Key Laboratory of Metal Matrix Composites. Shanghai Jiao Tong University, 2800 Dong Chuan Rd., Minhang District, Shanghai 200240 (PR China). han.liyuan@nims.go.jp.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Han
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D008277:Magnesium Oxide / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D008277:Magnesium Oxide; D014025:Titanium
keywords: magnesium; nanoparticles; photochemistry; thin films; titanium