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Investigating the Superoxide Formation and Stability in Mesoporous Carbon Perovskite Solar Cells with an Aminovaleric Acid Additive

Emmanuel Pean, Catherine De Castro Orcid Logo, Stoichko Dimitrov Orcid Logo, Francesca De Rossi Orcid Logo, Simone Meroni Orcid Logo, Jenny Baker Orcid Logo, Trystan Watson Orcid Logo, Matthew Davies Orcid Logo

Advanced Functional Materials, Volume: 30, Issue: 12

Swansea University Authors: Emmanuel Pean, Catherine De Castro Orcid Logo, Stoichko Dimitrov Orcid Logo, Francesca De Rossi Orcid Logo, Simone Meroni Orcid Logo, Jenny Baker Orcid Logo, Trystan Watson Orcid Logo, Matthew Davies Orcid Logo

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DOI (Published version): 10.1002/adfm.201909839

Abstract

Perovskite solar cells have attracted a great deal of attention thanks to their high efficiency, ease of manufacturing, and potential low cost. However, the stability of these devices is considered their main drawback and needs to be addressed. Mesoporous carbon perovskite solar cells (m-CPSC), cons...

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Published in: Advanced Functional Materials
ISSN: 1616-301X 1616-3028
Published: Wiley 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa53376
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Abstract: Perovskite solar cells have attracted a great deal of attention thanks to their high efficiency, ease of manufacturing, and potential low cost. However, the stability of these devices is considered their main drawback and needs to be addressed. Mesoporous carbon perovskite solar cells (m-CPSC), consisting of three mesoporous layers (TiO2/ZrO2/C) infiltrated with CH3NH3PbI3 (MAPI) perovskite, have presented excellent lifetimes of more than 10 000 h when the additive NH2(CH2)4CO2HI (5- aminovaleric acid iodide; 5-AVAI) is used to modify the perovskite structure. Yet, the role of 5-AVAI in enhancing the stability has yet to be determined. Here, superoxide-mediated degradation of MAPI m-CPSC with and without the 5-AVAI additive is studied using the fluorescence probe dihydroeth-idium for superoxide detection. In situ X-ray diffractometry shows that amino valeric acid methylammonium lead iodide (AVA-MAPI) perovskite infiltrated in mesoporous layers presents higher stability in an ambient environment under illumination, evidenced by a slower decrease of the MAPI/PbI2 peak ratio. Superoxide yield measurements demonstrate that AVA-MAPI generates more superoxide than regular MAPI when deposited on glass but generates significantly less when infiltrated in mesoporous layers. It is believed that superoxide formation in m-CPSC is dependent on a combination of competitive factors including oxygen diffusion, sample morphology, grain size, and defect concentration.
Keywords: AVA-MAPI, dihydroethidium, flurorescence, in situ x-ray diffractometry
College: Faculty of Science and Engineering
Funders: UKRI, EPSRC
Issue: 12