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Zr Incorporation into TiO2 Electrodes Reduces Hysteresis and Improves Performance in Hybrid Perovskite Solar Cells while Increasing Carrier Lifetimes
journal contribution
posted on 2015-12-17, 07:21 authored by Hirokazu Nagaoka, Fei Ma, Dane W. deQuilettes, Sarah M. Vorpahl, Micah
S. Glaz, Adam E. Colbert, Mark E. Ziffer, David S. GingerWe investigate zirconium (Zr) incorporation
into the titanium dioxide
(TiO2) electron-transporting layer used in organometal
halide perovskite photovoltaics. Compared to Zr-free controls, solar
cells employing electrodes containing Zr exhibit increased power conversion
efficiency (PCE) and decreased hysteresis. We use transient photovoltage
and photocurrent extraction to measure carrier lifetimes and densities
and observe longer carrier lifetimes and higher charge densities in
devices on Zr-containing electrodes at microsecond times as well as
longer persistent photovoltages extending from ∼milliseconds
to tens of seconds. We characterize the surface stoichiometry and
change in work function and reduction potential of the TiO2 upon incorporation of Zr and discuss the charge recombination at
the TiO2 interface in the context of these variables. Finally,
we show that the combination of Zr–TiO2 electrode
modification with device pyridine treatment leads to a cumulative
improvement in performance.
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measure carrier lifetimesdensityZr Incorporationcharge recombinationcarrier lifetimespower conversion efficiencycharge densitieselectrodePCEtitanium dioxideZr exhibitorganometal halide perovskite photovoltaicsdevice pyridine treatmentwork functionincorporationmicrosecond timesCarrier LifetimesWephotovoltagephotocurrent extractionTiO 2 ElectrodesHybrid Perovskite Solar Cellssurface stoichiometryTiO 2 interfaceTiO 2
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