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Origin of performance enhancement in TiO2-carbon nanotube composite perovskite solar cells

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Title: Origin of performance enhancement in TiO2-carbon nanotube composite perovskite solar cells
Authors: Macdonald, TJ
Batmunkh, M
Lin, C-T
Kim, J
Tune, DD
Ambroz, F
Li, X
Xu, S
Sol, C
Papakonstantinou, I
McLachlan, MA
Parkin, IP
Shapter, JG
Durrant, JR
Item Type: Journal Article
Abstract: Carbon nanotubes are shown to be beneficial additives to perovskite solar cells, and the inclusion of such nanomaterials will continue to play a crucial role in the push toward developing efficient and stable device architectures. Herein, titanium dioxide/carbon nanotube composite perovskite solar cells are fabricated, and device performance parameters are correlated with spectroscopic signatures of the materials to understand the origin of performance enhancement. By probing the charge carrier dynamics with photoluminescence and femtosecond transient absorption spectroscopy, the results indicate that charge transfer is not improved by the presence of the carbon nanotubes. Instead, carbon nanotubes are shown to passivate the electronic defect states within the titanium dioxide, which can lead to stronger radiative recombination in the titanium dioxide/carbon nanotube films. The defect passivation allows the perovskite solar cells made using an optimized titanium dioxide/carbon nanotube composite to achieve a peak power conversion efficiency of 20.4% (19% stabilized), which is one of the highest values reported for perovskite solar cells not incorporating a mixed cation light absorbing layer. The results discuss new fundamental understandings for the role of carbon nanomaterials in perovskite solar cells and present a significant step forward in advancing the field of high‐performance photovoltaics.
Issue Date: 1-Oct-2019
Date of Acceptance: 1-May-2019
URI: http://hdl.handle.net/10044/1/74619
DOI: 10.1002/smtd.201900164
ISSN: 2366-9608
Publisher: Wiley-Blackwell
Start Page: 1
End Page: 10
Journal / Book Title: Small Methods
Volume: 3
Issue: 10
Copyright Statement: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Macdonald, T. J., Batmunkh, M., Lin, C.‐T., Kim, J., Tune, D. D., Ambroz, F., Li, X., Xu, S., Sol, C., Papakonstantinou, I., McLachlan, M. A., Parkin, I. P., Shapter, J. G., Durrant, J. R., Origin of Performance Enhancement in TiO2‐Carbon Nanotube Composite Perovskite Solar Cells. Small Methods 2019, 3, 1900164, which has been published in final form at https://doi.org/10.1002/smtd.201900164
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
carbon nanotubes
CNTs
device performance
perovskite solar cells
titanium dioxide
WALLED CARBON NANOTUBES
LEAD IODIDE PEROVSKITE
CHARGE-TRANSFER
BASE ADDUCT
EFFICIENCY
PLANAR
STATE
HYSTERESIS
TRANSPORT
LAYERS
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
carbon nanotubes
CNTs
device performance
perovskite solar cells
titanium dioxide
WALLED CARBON NANOTUBES
LEAD IODIDE PEROVSKITE
CHARGE-TRANSFER
BASE ADDUCT
EFFICIENCY
PLANAR
STATE
HYSTERESIS
TRANSPORT
LAYERS
Publication Status: Published
Article Number: ARTN 1900164
Online Publication Date: 2019-05-10
Appears in Collections:Materials
Chemistry
Faculty of Natural Sciences