title: Lead methylammonium triiodide perovskite-based solar cells: an interfacial charge-transfer investigation.
abstract: This work reports on an investigation into interfacial charge transfer in CH3NH3PbI3 perovskite solar cells by using anatase TiO2 nanocuboids enclosed by active {100} and {001} facets. The devices show 6.0 and 8.0% power conversion efficiency with and without hole-transport material. Transient photovoltage/photocurrent decay and charge extraction, as well as impedance spectroscopy measurements, reveal that carbon materials are effective counter electrodes in perovskite solar cells. The photogenerated charges are observed to be stored in mesoporous TiO2 film under illumination and in the CH3NH3PbI3 layer in the dark. The use of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (spiro-MeOTAD) as a hole-transport material accelerates interfacial charge recombination between the photogenerated electrons and holes.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (P.R. China).
authors.forename: Xiaobao
authors.initials: X
authors.lastname: Xu
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Kun
authors.initials: K
authors.lastname: Cao
authors.forename: Jin
authors.initials: J
authors.lastname: Cui
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Lu
authors.forename: Xianwei
authors.initials: X
authors.lastname: Zeng
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Mingkui
authors.initials: M
authors.lastname: Wang
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D011211:Electric Power Supplies; D007454:Iodides / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D008027:Light; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D007454:Iodides; D010087:Oxides; D000644:Quaternary Ammonium Compounds; C059910:perovskite; C009495:titanium dioxide; D007854:Lead; D002244:Carbon; D014025:Titanium
keywords: carbon; electrochemistry; kinetics; perovskite phases; solar cells