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Potassium- and Rubidium-Passivated Alloyed Perovskite Films: Optoelectronic Properties and Moisture Stability
Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England.
Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England.
Univ Cambridge, Dept Phys, Cavendish Lab, Cambridge CB3 0HE, England.
Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England.ORCID iD: 0000-0003-2775-610X
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2018 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 3, no 11, p. 2671-2678Article in journal (Refereed) Published
Abstract [en]

Halide perovskites passivated with potassium or rubidium show superior photovoltaic device performance compared to unpassivated samples. However, it is unclear which passivation route is more effective for film stability. Here, we directly compare the optoelectronic properties and stability of thin films when passivating triple-cation perovskite films with potassium or rubidium species. The optoelectronic and chemical studies reveal that the alloyed perovskites are tolerant toward higher loadings of potassium than rubidium. Whereas potassium complexes with bromide from the perovskite precursor solution to form thin surface passivation layers, rubidium additives favor the formation of phase-segregated micron-sized rubidium halide crystals. This tolerance to higher loadings of potassium allows us to achieve superior passivation. We also find that exposure to a humid atmosphere drives phase luminescent properties with potassium segregation and grain coalescence for all compositions, with the rubidium-passivated sample showing the highest sensitivity to nonperovskite phase formation. Our work highlights the benefits but also the limitations of these passivation approaches in maximizing both optoelectronic properties and the stability of perovskite films.

Place, publisher, year, edition, pages
2018. Vol. 3, no 11, p. 2671-2678
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-371401DOI: 10.1021/acsenergylett.8b01504ISI: 000450374600006OAI: oai:DiVA.org:uu-371401DiVA, id: diva2:1273117
Funder
EU, Horizon 2020, 756962EU, European Research Council, 25961976Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-01-07Bibliographically approved

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Philippe, BertrandRensmo, Håkan

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