title: Enhanced PEC performance of nanoporous Si photoelectrodes by covering HfO2and TiO2passivation layers.
abstract: Nanostructured Si as the high efficiency photoelectrode material is hard to keep stable in aqueous for water splitting. Capping a passivation layer on the surface of Si is an effective way of protecting from oxidation. However, it is still not clear in the different mechanisms and effects between insulating oxide materials and oxide semiconductor materials as passivation layers. Here, we compare the passivation effects, the photoelectrochemical (PEC) properties, and the corresponding mechanisms between the HfO2/nanoporous-Si and the TiO2/nanoporous-Si by I-V curves, Motte-schottky (MS) curves, and electrochemical impedance spectroscopy (EIS). Although the saturated photocurrent densities of the TiO2/nanoporous Si are lower than that of the HfO2/nanoporous Si, the former is more stable than the later.
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Xing
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Ren
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Hengyi
authors.initials: H
authors.lastname: Wu
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Wu
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Xuening
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Jingli
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Da
authors.initials: D
authors.lastname: Wan
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Guozhen
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Center for Ion Beam Application and Center for Electron Microscopy, School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Changzhong
authors.initials: C
authors.lastname: Jiang