Distinguishing electron diffusion and extraction in methylammonium lead iodide

Peter Brown; Arvydas Ruseckas; Lethy Krishnan Jagadamma; Oskar Blaszczyk; Jonathon R. Harwell; Natalie A. Mica; Eli Zysman-Colman; Ifor D. W. Samuel

doi:10.1021/acs.jpclett.3c00082

Distinguishing electron diffusion and extraction in methylammonium lead iodide

Peter Brown, Arvydas Ruseckas, Lethy Krishnan Jagadamma, Oskar Blaszczyk, Jonathon R. Harwell, Natalie A. Mica, Eli Zysman-Colman^*, Ifor D. W. Samuel^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Charge diffusion and extraction are crucial steps in the operation of solar cells. Here we show that time-resolved photoluminescence can be used to study electron diffusion in hybrid perovskite films and subsequent transfer to the adjacent electron extraction layer. As diffusion and transfer to the extraction layer are consecutive processes, they can be hard to distinguish, but by exciting from each side of the sample we can separate them and identify which process limits charge extraction. We find that the introduction of a fullerene monolayer between the methylammonium lead iodide (MAPbI₃) and the electron-transporting SnO₂ layers greatly increases the electron transfer velocity between them to the extent that electron diffusion limits the rate of electron extraction. Our results suggest that increasing the electron diffusion coefficient in MAPbI₃ would further enhance the electron extraction rate, which could result in more efficient n–i–p type solar cells.

Original language	English
Pages (from-to)	3007–3013
Number of pages	7
Journal	The Journal of Physical Chemistry Letters
Volume	14
Issue number	12
Early online date	21 Mar 2023
DOIs	https://doi.org/10.1021/acs.jpclett.3c00082
Publication status	Published - 30 Mar 2023

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Copyright © 2023 The Authors. Published by American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder.
Final published version, 2.34 MBLicence: CC BY

EPSRC-JSPS Core-to-core Grant: EPSRC-JSPS Core-to-Core Grant Application
Samuel, I. D. W. (PI)
1/08/18 → 31/07/23
Project: Standard
H2020 MSCA - PHOTOPEROVSKITIES: H2020 MSCA Fellowship 2016 Lethy
Samuel, I. D. W. (PI)
European Commission
1/09/17 → 31/08/19
Project: Fellowship
Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale
Samuel, I. D. W. (PI)
EPSRC
1/10/13 → 30/09/23
Project: Standard

Distinguishing Electron Diffusion and Extraction in Methylammonium Lead Iodide (dataset)
Brown, P. (Creator), Ruseckas, A. (Creator), Krishnan Jagadamma, L. (Creator), Blaszczyk, O. (Creator), Harwell, J. R. (Creator), Mica, N. A. (Creator), Zysman-Colman, E. (Creator) & Samuel, I. D. W. (Creator), University of St Andrews, 22 Mar 2023
DOI: 10.17630/049fbc45-a235-44f3-a27f-e06061af17a4
Dataset

File

Cite this

@article{cae9384764dd477c97c91bca69a2b032,

title = "Distinguishing electron diffusion and extraction in methylammonium lead iodide",

abstract = "Charge diffusion and extraction are crucial steps in the operation of solar cells. Here we show that time-resolved photoluminescence can be used to study electron diffusion in hybrid perovskite films and subsequent transfer to the adjacent electron extraction layer. As diffusion and transfer to the extraction layer are consecutive processes, they can be hard to distinguish, but by exciting from each side of the sample we can separate them and identify which process limits charge extraction. We find that the introduction of a fullerene monolayer between the methylammonium lead iodide (MAPbI3) and the electron-transporting SnO2 layers greatly increases the electron transfer velocity between them to the extent that electron diffusion limits the rate of electron extraction. Our results suggest that increasing the electron diffusion coefficient in MAPbI3 would further enhance the electron extraction rate, which could result in more efficient n–i–p type solar cells.",

author = "Peter Brown and Arvydas Ruseckas and {Krishnan Jagadamma}, Lethy and Oskar Blaszczyk and Harwell, {Jonathon R.} and Mica, {Natalie A.} and Eli Zysman-Colman and Samuel, {Ifor D. W.}",

note = "Funding: The authors are grateful to EPSRC for equipment and research grants (EP/L017008/1 and EP/R035164/1) and for a Ph.D. studentship to P.E.B. (EP/R513337/1). Dr. L. K. Jagadamma acknowledges support from a Marie Sk{\l}odowska-Curie Individual Fellowship (745776) and funding from UKRI-FLF through grant MR/T022094/1.",

year = "2023",

month = mar,

day = "30",

doi = "10.1021/acs.jpclett.3c00082",

language = "English",

volume = "14",

pages = "3007–3013",

journal = "The Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society (ACS)",

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TY - JOUR

T1 - Distinguishing electron diffusion and extraction in methylammonium lead iodide

AU - Brown, Peter

AU - Ruseckas, Arvydas

AU - Krishnan Jagadamma, Lethy

AU - Blaszczyk, Oskar

AU - Harwell, Jonathon R.

AU - Mica, Natalie A.

AU - Zysman-Colman, Eli

AU - Samuel, Ifor D. W.

N1 - Funding: The authors are grateful to EPSRC for equipment and research grants (EP/L017008/1 and EP/R035164/1) and for a Ph.D. studentship to P.E.B. (EP/R513337/1). Dr. L. K. Jagadamma acknowledges support from a Marie Skłodowska-Curie Individual Fellowship (745776) and funding from UKRI-FLF through grant MR/T022094/1.

PY - 2023/3/30

Y1 - 2023/3/30

N2 - Charge diffusion and extraction are crucial steps in the operation of solar cells. Here we show that time-resolved photoluminescence can be used to study electron diffusion in hybrid perovskite films and subsequent transfer to the adjacent electron extraction layer. As diffusion and transfer to the extraction layer are consecutive processes, they can be hard to distinguish, but by exciting from each side of the sample we can separate them and identify which process limits charge extraction. We find that the introduction of a fullerene monolayer between the methylammonium lead iodide (MAPbI3) and the electron-transporting SnO2 layers greatly increases the electron transfer velocity between them to the extent that electron diffusion limits the rate of electron extraction. Our results suggest that increasing the electron diffusion coefficient in MAPbI3 would further enhance the electron extraction rate, which could result in more efficient n–i–p type solar cells.

AB - Charge diffusion and extraction are crucial steps in the operation of solar cells. Here we show that time-resolved photoluminescence can be used to study electron diffusion in hybrid perovskite films and subsequent transfer to the adjacent electron extraction layer. As diffusion and transfer to the extraction layer are consecutive processes, they can be hard to distinguish, but by exciting from each side of the sample we can separate them and identify which process limits charge extraction. We find that the introduction of a fullerene monolayer between the methylammonium lead iodide (MAPbI3) and the electron-transporting SnO2 layers greatly increases the electron transfer velocity between them to the extent that electron diffusion limits the rate of electron extraction. Our results suggest that increasing the electron diffusion coefficient in MAPbI3 would further enhance the electron extraction rate, which could result in more efficient n–i–p type solar cells.

U2 - 10.1021/acs.jpclett.3c00082

DO - 10.1021/acs.jpclett.3c00082

M3 - Article

SN - 1948-7185

VL - 14

SP - 3007

EP - 3013

JO - The Journal of Physical Chemistry Letters

JF - The Journal of Physical Chemistry Letters

IS - 12

ER -

Distinguishing electron diffusion and extraction in methylammonium lead iodide

Abstract

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Projects

EPSRC-JSPS Core-to-core Grant: EPSRC-JSPS Core-to-Core Grant Application

H2020 MSCA - PHOTOPEROVSKITIES: H2020 MSCA Fellowship 2016 Lethy

Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale

Datasets

Distinguishing Electron Diffusion and Extraction in Methylammonium Lead Iodide (dataset)

Cite this