Excellent long-range charge-carrier mobility in 2D perovskites
Excellent long-range charge-carrier mobility in 2D perovskites
The use of layered, 2D perovskites can improve the stability of metal halide perovskite thin films and devices. However, the charge carrier transport properties in layered perovskites are still not fully understood. Here, the sum of the electron and hole mobilities (Σμ) in thin films of the 2D perovskite PEA2PbI4, through transient electronically contacted nanosecond-to-millisecond photoconductivity measurements, which are sensitive to long-time, long-range (micrometer length scale) transport processes is investigated. After careful analysis, accounting for both early-time recombination and the evolution of the exciton-to-free-carrier population, a long-range mobility of 8.0 +/− 0.6 cm2 (V s)–1, which is ten times greater than the long-range mobility of a comparable 3D material FA0.9Cs0.1PbI3 is determined. These values are compared to ultra-fast transient time-resolved THz photoconductivity measurements, which are sensitive to early-time, shorter-range (tens of nm length scale) mobilities. Mobilities of 8 and 45 cm2 (V s)–1 in the case of the PEA2PbI4 and FA0.9Cs0.1PbI3, respectively, are obtained. This previously unreported concurrence between the long-range and short-range mobility in a 2D material indicates that the polycrystalline thin films already have single-crystal-like qualities. Hence, their fundamental charge carrier transport properties should aid device performance.
2D Ruddlesden–Popper perovskites, charge carrier transport, mobility, thin films
Kober-Czerny, Manuel
418ec6ea-7ecd-4c6e-aa9c-0452c92766a5
Motti, Silvia Genaro
17e505d8-5c5f-43e9-a5d3-370a0593e8f4
Holzhey, Philippe
2c9af053-fc05-453e-b987-b871dd1631b7
Wenger, Bernard
d2fae41e-da24-430a-a03c-6833e65df408
Lim, Jongchul
3ee69916-2194-4aae-944d-4373bbbd7674
Herz, Laura Maria
aa746f13-6aa3-45ae-87db-b4a6f90983b0
Snaith, Henry James
ca845120-296e-407e-84d0-4ced3179bd72
Kober-Czerny, Manuel
418ec6ea-7ecd-4c6e-aa9c-0452c92766a5
Motti, Silvia Genaro
17e505d8-5c5f-43e9-a5d3-370a0593e8f4
Holzhey, Philippe
2c9af053-fc05-453e-b987-b871dd1631b7
Wenger, Bernard
d2fae41e-da24-430a-a03c-6833e65df408
Lim, Jongchul
3ee69916-2194-4aae-944d-4373bbbd7674
Herz, Laura Maria
aa746f13-6aa3-45ae-87db-b4a6f90983b0
Snaith, Henry James
ca845120-296e-407e-84d0-4ced3179bd72
Kober-Czerny, Manuel, Motti, Silvia Genaro, Holzhey, Philippe, Wenger, Bernard, Lim, Jongchul, Herz, Laura Maria and Snaith, Henry James
(2022)
Excellent long-range charge-carrier mobility in 2D perovskites.
Advanced Functional Materials, 32 (36).
(doi:10.1002/adfm.202203064).
Abstract
The use of layered, 2D perovskites can improve the stability of metal halide perovskite thin films and devices. However, the charge carrier transport properties in layered perovskites are still not fully understood. Here, the sum of the electron and hole mobilities (Σμ) in thin films of the 2D perovskite PEA2PbI4, through transient electronically contacted nanosecond-to-millisecond photoconductivity measurements, which are sensitive to long-time, long-range (micrometer length scale) transport processes is investigated. After careful analysis, accounting for both early-time recombination and the evolution of the exciton-to-free-carrier population, a long-range mobility of 8.0 +/− 0.6 cm2 (V s)–1, which is ten times greater than the long-range mobility of a comparable 3D material FA0.9Cs0.1PbI3 is determined. These values are compared to ultra-fast transient time-resolved THz photoconductivity measurements, which are sensitive to early-time, shorter-range (tens of nm length scale) mobilities. Mobilities of 8 and 45 cm2 (V s)–1 in the case of the PEA2PbI4 and FA0.9Cs0.1PbI3, respectively, are obtained. This previously unreported concurrence between the long-range and short-range mobility in a 2D material indicates that the polycrystalline thin films already have single-crystal-like qualities. Hence, their fundamental charge carrier transport properties should aid device performance.
Text
Adv Funct Materials - 2022 - Kober‐Czerny
- Version of Record
More information
e-pub ahead of print date: 26 June 2022
Keywords:
2D Ruddlesden–Popper perovskites, charge carrier transport, mobility, thin films
Identifiers
Local EPrints ID: 480941
URI: http://eprints.soton.ac.uk/id/eprint/480941
ISSN: 1616-301X
PURE UUID: 9a28b473-2cd9-403f-bfed-e288065597b3
Catalogue record
Date deposited: 10 Aug 2023 17:02
Last modified: 17 Mar 2024 04:17
Export record
Altmetrics
Contributors
Author:
Manuel Kober-Czerny
Author:
Silvia Genaro Motti
Author:
Philippe Holzhey
Author:
Bernard Wenger
Author:
Jongchul Lim
Author:
Laura Maria Herz
Author:
Henry James Snaith
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics