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Potassium iodide reduces the stability of triple-cation perovskite solar cells
The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence their performance when used in solar cell devices. Previous work on the use of potassium iodide (KI) in active layers to passivate defects in triple-cation mixed-halide perovs...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057489/ https://www.ncbi.nlm.nih.gov/pubmed/35520836 http://dx.doi.org/10.1039/d0ra07107b |
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author | Alanazi, Tarek I. Game, Onkar S. Smith, Joel A. Kilbride, Rachel C. Greenland, Claire Jayaprakash, Rahul Georgiou, Kyriacos Terrill, Nicholas J. Lidzey, David G. |
author_facet | Alanazi, Tarek I. Game, Onkar S. Smith, Joel A. Kilbride, Rachel C. Greenland, Claire Jayaprakash, Rahul Georgiou, Kyriacos Terrill, Nicholas J. Lidzey, David G. |
author_sort | Alanazi, Tarek I. |
collection | PubMed |
description | The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence their performance when used in solar cell devices. Previous work on the use of potassium iodide (KI) in active layers to passivate defects in triple-cation mixed-halide perovskites has been shown to enhance their luminescence efficiency and reduce current–voltage hysteresis. However, the operational stability of KI passivated perovskite solar cells under ambient conditions remains largely unexplored. By investigating perovskite solar cell performance with SnO(2) or TiO(2) electron transport layers (ETL), we propose that defect passivation using KI is highly sensitive to the composition of the perovskite–ETL interface. We reconfirm findings from previous reports that KI preferentially interacts with bromide ions in mixed-halide perovskites, and – at concentrations >5 mol% in the precursor solution – modifies the primary absorber composition as well as leading to the phase segregation of an undesirable secondary non-perovskite phase (KBr) at high KI concentration. Importantly, by studying both material and device stability under continuous illumination and bias under ambient/high-humidity conditions, we show that this secondary phase becomes a favourable degradation product, and that devices incorporating KI have reduced stability. |
format | Online Article Text |
id | pubmed-9057489 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90574892022-05-04 Potassium iodide reduces the stability of triple-cation perovskite solar cells Alanazi, Tarek I. Game, Onkar S. Smith, Joel A. Kilbride, Rachel C. Greenland, Claire Jayaprakash, Rahul Georgiou, Kyriacos Terrill, Nicholas J. Lidzey, David G. RSC Adv Chemistry The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence their performance when used in solar cell devices. Previous work on the use of potassium iodide (KI) in active layers to passivate defects in triple-cation mixed-halide perovskites has been shown to enhance their luminescence efficiency and reduce current–voltage hysteresis. However, the operational stability of KI passivated perovskite solar cells under ambient conditions remains largely unexplored. By investigating perovskite solar cell performance with SnO(2) or TiO(2) electron transport layers (ETL), we propose that defect passivation using KI is highly sensitive to the composition of the perovskite–ETL interface. We reconfirm findings from previous reports that KI preferentially interacts with bromide ions in mixed-halide perovskites, and – at concentrations >5 mol% in the precursor solution – modifies the primary absorber composition as well as leading to the phase segregation of an undesirable secondary non-perovskite phase (KBr) at high KI concentration. Importantly, by studying both material and device stability under continuous illumination and bias under ambient/high-humidity conditions, we show that this secondary phase becomes a favourable degradation product, and that devices incorporating KI have reduced stability. The Royal Society of Chemistry 2020-11-06 /pmc/articles/PMC9057489/ /pubmed/35520836 http://dx.doi.org/10.1039/d0ra07107b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Alanazi, Tarek I. Game, Onkar S. Smith, Joel A. Kilbride, Rachel C. Greenland, Claire Jayaprakash, Rahul Georgiou, Kyriacos Terrill, Nicholas J. Lidzey, David G. Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title | Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title_full | Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title_fullStr | Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title_full_unstemmed | Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title_short | Potassium iodide reduces the stability of triple-cation perovskite solar cells |
title_sort | potassium iodide reduces the stability of triple-cation perovskite solar cells |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057489/ https://www.ncbi.nlm.nih.gov/pubmed/35520836 http://dx.doi.org/10.1039/d0ra07107b |
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