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One‐Dimensional Self‐Standing TiO 2 Nanotube Array Layers Designed for Perovskite Solar Cell Applications
Author(s) -
Zhang Jie,
Pauporté Thierry
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500456
Subject(s) - materials science , anatase , perovskite (structure) , nanowire , nanotechnology , nanotube , crystallite , perovskite solar cell , chemical engineering , nanorod , nanostructure , absorbance , current density , optoelectronics , layer (electronics) , optics , carbon nanotube , photocatalysis , chemistry , biochemistry , physics , quantum mechanics , engineering , metallurgy , catalysis
Nanotube (NT) layers of TiO 2 are important one‐dimensional nanostructures for advanced applications. ZnO nanowire arrays prepared through electrochemical deposition with tuned morphological properties are converted into anatase TiO 2 NTs by using a titanate solution adjusted to an ad hoc pH. The tubes are polycrystalline and their diameter and length can be tuned to obtain nanostructures of tailored dimensions. The layers are integrated in CH 3 NH 3 PbI 3 perovskite solar cells (PSCs). Their morphology is optimized for maximum performance and is compared to mesoscopic TiO 2 PSCs. As compared to the latter, the use of NTs improved the perovskite absorbance in the green‐to‐near‐infrared solar spectral region. Moreover, it is shown that the surface treatment of the TiO 2 NTs with TiCl 4 optimizes the interface between the oxide and CH 3 NH 3 PbI 3 , which leads to better charge injection between the perovskite layer and the TiO 2 NTs. The current density–voltage curve hysteresis index is low for the best NT morphology and significantly increases with tube length and diameter.