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research article

Hydrogen Diffusion in Hybrid Perovskites from Exchange NMR

Hope, Michael A.
•
Mishra, Aditya  
•
Emsley, Lyndon  
July 24, 2024
Chemistry of Materials

Ion migration is an important phenomenon affecting the performance of hybrid perovskite solar cells. It is particularly challenging, however, to disentangle the contribution of H+ diffusion from that of other ions, and the atomic-scale mechanism remains unclear. Here, we use H-2 exchange NMR to prove that H-2(+) ions exchange between MA(+) cations on the time scale of seconds for both MAPbI(3) and FA(0.7)MA(0.3)PbI(3) perovskites. We do this by exploiting N-15-enriched MA(+) to label the cations by their N-15 spin state. The exchange rates and activation energy are then calculated by performing experiments as functions of mixing time and temperature. By comparing the measured exchange rates to previously measured bulk H+ diffusivities, we demonstrate that, after dissociating, H+ ions travel through the lattice before associating to another cation rather than hopping between adjacent cations.

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Type
research article
DOI
10.1021/acs.chemmater.4c01498
Web of Science ID

WOS:001276242000001

PubMed ID

39156713

Author(s)
Hope, Michael A.
•
Mishra, Aditya  
•
Emsley, Lyndon  
Date Issued

2024-07-24

Publisher

AMER CHEMICAL SOC

Published in
Chemistry of Materials
Volume

36

Issue

15

Start page

7525

End page

7532

Subjects

SOLID-STATE NMR

•

METHYLAMMONIUM LEAD IODIDE

•

CATION DYNAMICS

•

MIGRATION

•

HYDRATION

•

CURVES

•

Science & Technology

•

Physical Sciences

•

Technology

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LRM  
FunderFunding(s)Grant NumberGrant URL

Swiss National Science Foundation (SNSF)

200020_212046

Available on Infoscience
February 1, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/246237
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