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Additive-free, low-temperature crystallization of stable alpha-FAPbI(3) perovskite

Title: Additive-free, low-temperature crystallization of stable alpha-FAPbI(3) perovskite
Authors: Du, T
Macdonald, TJ
Yang, RX
Li, M
Jiang, Z
Mohan, L
Xu, W
Su, Z
Gao, X
Whiteley, R
Lin, C-T
Min, G
Haque, SA
Durrant, JR
Persson, KA
McLachlan, MA
Briscoe, J
Item Type: Journal Article
Abstract: Formamidinium lead triiodide (FAPbI3) is attractive for photovoltaic devices due to its optimal bandgap at around 1.45 eV and improved thermal stability compared with methylammonium-based perovskites. Crystallization of phase-pure α-FAPbI3 conventionally requires high-temperature thermal annealing at 150 °C whilst the obtained α-FAPbI3 is metastable at room temperature. Here, aerosol-assisted crystallization (AAC) is reported, which converts yellow δ-FAPbI3 into black α-FAPbI3 at only 100 °C using precursor solutions containing only lead iodide and formamidinium iodide with no chemical additives. The obtained α-FAPbI3 exhibits remarkably enhanced stability compared to the 150 °C annealed counterparts, in combination with improvements in film crystallinity and photoluminescence yield. Using X-ray diffraction, X-ray scattering, and density functional theory simulation, it is identified that relaxation of residual tensile strains, achieved through the lower annealing temperature and post-crystallization crystal growth during AAC, is the key factor that facilitates the formation of phase-stable α-FAPbI3. This overcomes the strain-induced lattice expansion that is known to cause the metastability of α-FAPbI3. Accordingly, pure FAPbI3 p–i–n solar cells are reported, facilitated by the low-temperature (≤100 °C) AAC processing, which demonstrates increases of both power conversion efficiency and operational stability compared to devices fabricated using 150 °C annealed films.
Issue Date: 3-Mar-2022
Date of Acceptance: 1-Dec-2021
URI: http://hdl.handle.net/10044/1/94466
DOI: 10.1002/adma.202107850
ISSN: 0935-9648
Publisher: Wiley
Start Page: 1
End Page: 10
Journal / Book Title: Advanced Materials
Volume: 34
Issue: 9
Copyright Statement: © 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Sponsor/Funder: National Research Foundation of Korea (NRF)
Ministry of Science, ICT & Future Planning
Funder's Grant Number: NRF-2017K1A1A2013153
NRF-2017K1A1A2013153
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
additive-free
aerosol-assisted crystallization
formamidinium lead triiodide
stability
strain
SOLAR-CELLS
FORMAMIDINIUM
EFFICIENCY
CATIONS
ADDUCT
additive-free
aerosol-assisted crystallization
formamidinium lead triiodide
stability
strain
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
additive-free
aerosol-assisted crystallization
formamidinium lead triiodide
stability
strain
SOLAR-CELLS
FORMAMIDINIUM
EFFICIENCY
CATIONS
ADDUCT
Nanoscience & Nanotechnology
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Publication Status: Published
Open Access location: https://onlinelibrary.wiley.com/doi/10.1002/adma.202107850
Article Number: ARTN 2107850
Online Publication Date: 2021-12-11
Appears in Collections:Materials
Bioengineering
Chemistry
Faculty of Natural Sciences
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons