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Download fileControllable Preparation of Rutile TiO2 Nanorod Array for Enhanced Photovoltaic Performance of Perovskite Solar Cells
journal contribution
posted on 2018-03-26, 00:00 authored by Shufang Wu, Chi Chen, Jinming Wang, Jiangrong Xiao, Tianyou PengA vertically oriented
rutile TiO2 nanorod (NR) array,
as an efficient electron transport layer (ETL), has been used in the
perovskite solar cells (PSCs), and its microstructure has a great
impact on the corresponding photovoltaic conversion efficiency (PCE).
Here we employ a facile control strategy to modulate the microstructures
of rutile TiO2 NR arrays hydrothermally grown on the fluorine
tin oxide (FTO) glass from a water–HCl solution of titanium n-butoxide (TBOT). It was found that introducing commercial
TiO2 nanoparticles (P25, Degussa) into the hydrothermal
reaction system can efficiently slow down the growth rate of rutile
TiO2 NRs, thus causing the controllable preparation of
an NR array on the FTO substrate. The device fabricated with an optimized
NR array derived from the hydrothermal reaction solution containing
P25 exhibits an improvement of 26.5% in PCE compared with the device
fabricated with the NR array from the hydrothermal solution without
P25, which is mainly attributed to the reduced charge recombination
and the enhanced fill factor stemming from the better contact at the
NRs array/perovskite interface. This successful finding demonstrates
that the introduction of TiO2 nanoparticles into the hydrothermal
reaction solution of TBOT slows down the growth rate and the electron
recombination process of the rutile TiO2 NRs array, and
thus acts as a facile control strategy for improving the photovoltaic
performance of the rutile TiO2 NRs array film-based PSCs.
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Keywords
electron recombination processrutile TiO 2 NR arrays hydrothermallyoptimized NR arrayhydrothermal reaction systemelectron transport layerP 25 exhibitsTBOTrutile TiO 2 NRs array film-based PSCsNR arraycontrol strategyRutile TiO 2 Nanorod ArrayPCETiO 2 nanoparticlesrutile TiO 2 nanorodphotovoltaic conversion efficiencyFTOrutile TiO 2 NRsfluorine tin oxideETLEnhanced Photovoltaic PerformancePerovskite Solar Cellsrutile TiO 2 NRs arrayhydrothermal reaction solutiongrowth rate