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Influence of hole mobility on charge separation and recombination dynamics at lead halide perovskite and spiro-ometad interface

Liu, Maning LU orcid ; Liu, Hanming ; Padmaperuma, Safna Ravindi ; Endo, Masaru ; Shimazaki, Ai ; Wakamiya, Atsushi and Tachibana, Yasuhiro (2019) In Journal of Photopolymer Science and Technology 32(5). p.727-733
Abstract

High efficiency lead halide perovskite solar cells employ spiro-OMeTAD or PTAA as a hole transporting material. This type of hole conductor requires dopants mainly to improve hole mobility. Although such doping has improved solar cell performance, in particular open circuit photovoltage and fill factor, the mechanism of the improvement has rarely been elucidated. Here, we demonstrate influence of dopants in spiro-OMeTAD on interfacial charge separation and recombination processes for a MAPbI3 perovskite film sandwiched by an m-TiO2 film and a spiro-OMeTAD layer by employing a series of transient absorption spectroscopies. The interfacial charge recombination time was significantly retarded by the doping. We propose... (More)

High efficiency lead halide perovskite solar cells employ spiro-OMeTAD or PTAA as a hole transporting material. This type of hole conductor requires dopants mainly to improve hole mobility. Although such doping has improved solar cell performance, in particular open circuit photovoltage and fill factor, the mechanism of the improvement has rarely been elucidated. Here, we demonstrate influence of dopants in spiro-OMeTAD on interfacial charge separation and recombination processes for a MAPbI3 perovskite film sandwiched by an m-TiO2 film and a spiro-OMeTAD layer by employing a series of transient absorption spectroscopies. The interfacial charge recombination time was significantly retarded by the doping. We propose that the retardation of the charge recombination originates from relatively longer distance of holes from the perovskite/spiro-OMeTAD interface owing to the increased hole mobility by the doping, potentially increasing Voc of the solar cell.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
CH3NH3PbI3 perovskite, Charge carrier mobility, Interfacial charge recombination, OMeTAD
in
Journal of Photopolymer Science and Technology
volume
32
issue
5
pages
7 pages
publisher
Tokai University
external identifiers
  • scopus:85075172244
ISSN
0914-9244
DOI
10.2494/photopolymer.32.727
language
English
LU publication?
no
id
fa301331-37df-4af8-8465-9f1d86bc4881
date added to LUP
2023-08-24 12:34:43
date last changed
2023-08-28 09:02:21
@article{fa301331-37df-4af8-8465-9f1d86bc4881,
  abstract     = {{<p>High efficiency lead halide perovskite solar cells employ spiro-OMeTAD or PTAA as a hole transporting material. This type of hole conductor requires dopants mainly to improve hole mobility. Although such doping has improved solar cell performance, in particular open circuit photovoltage and fill factor, the mechanism of the improvement has rarely been elucidated. Here, we demonstrate influence of dopants in spiro-OMeTAD on interfacial charge separation and recombination processes for a MAPbI<sub>3</sub> perovskite film sandwiched by an m-TiO<sub>2</sub> film and a spiro-OMeTAD layer by employing a series of transient absorption spectroscopies. The interfacial charge recombination time was significantly retarded by the doping. We propose that the retardation of the charge recombination originates from relatively longer distance of holes from the perovskite/spiro-OMeTAD interface owing to the increased hole mobility by the doping, potentially increasing Voc of the solar cell.</p>}},
  author       = {{Liu, Maning and Liu, Hanming and Padmaperuma, Safna Ravindi and Endo, Masaru and Shimazaki, Ai and Wakamiya, Atsushi and Tachibana, Yasuhiro}},
  issn         = {{0914-9244}},
  keywords     = {{CH3NH3PbI3 perovskite; Charge carrier mobility; Interfacial charge recombination; OMeTAD}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{727--733}},
  publisher    = {{Tokai University}},
  series       = {{Journal of Photopolymer Science and Technology}},
  title        = {{Influence of hole mobility on charge separation and recombination dynamics at lead halide perovskite and spiro-ometad interface}},
  url          = {{http://dx.doi.org/10.2494/photopolymer.32.727}},
  doi          = {{10.2494/photopolymer.32.727}},
  volume       = {{32}},
  year         = {{2019}},
}