Influence of hole mobility on charge separation and recombination dynamics at lead halide perovskite and spiro-ometad interface
(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
- Liu, Maning LU ; Liu, Hanming ; Padmaperuma, Safna Ravindi ; Endo, Masaru ; Shimazaki, Ai ; Wakamiya, Atsushi and Tachibana, Yasuhiro
- publishing date
- 2019
- 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}}, }