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Preparation of mixed-ion and inorganic perovskite films using water and isopropanol as solvents for solar cell applications
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Mandalay Univ, Dept Phys, Mat Sci Res Lab, Mandalay, Myanmar.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Sharif Univ Technol, Dept Phys, Tehran 14588, Iran.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
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2018 (English)In: Sustainable Energy & Fuels, E-ISSN 2398-4902, Vol. 2, no 3, p. 606-615Article in journal (Refereed) Published
Abstract [en]

Presently, the most efficient lead halide perovskite solar cells are manufactured by using high-boiling point organic solvents to dissolve the perovskite precursor materials prior to the perovskite formation. Previously, efforts have been made to exchange the said solvents for water with some success. Herein, we build on that work to develop a procedure for synthesising perovskite absorbers using only water and isopropanol as solvents. Our technique can be utilised for fabricating many different perovskite compositions, organic and inorganic. The technique is based on the high solubility of metal nitrates, such as lead(ii) nitrate and caesium(i) nitrate, in water and, respectively, their poor solubilities in isopropanol. The inclusion of CsNO3 to Pb(NO3)2 films does not result in a phase separation of the perovskite material as one would expect when using lead(ii) halide precursor films. Using the perovskite composition Cs0.1FA0.9Pb(I0.83Br0.17)3 we were able to reach an average solar cell power conversion efficiency of 13.0%. Furthermore, the technique can be applied to many different perovskite compositions making it appealing for large-scale manufacturing of perovskite solar cells.

Place, publisher, year, edition, pages
The Royal Society of Chemistry , 2018. Vol. 2, no 3, p. 606-615
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-340427DOI: 10.1039/C7SE00538EISI: 000426712600011OAI: oai:DiVA.org:uu-340427DiVA, id: diva2:1178781
Funder
Göran Gustafsson Foundation for Research in Natural Sciences and MedicineSwedish Energy AgencyÅForsk (Ångpanneföreningen's Foundation for Research and Development)Swedish Research Council FormasSwedish Foundation for Strategic Research Swedish Research CouncilAvailable from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-05-23Bibliographically approved
In thesis
1. Preparation and Characterization of Lead Halide Perovskites: Towards sustainable, cost-effective and upscalable solar cell manufacture
Open this publication in new window or tab >>Preparation and Characterization of Lead Halide Perovskites: Towards sustainable, cost-effective and upscalable solar cell manufacture
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The perovskite solar cell (PSC) is a recent contender within the photovoltaic research field. In a matter of a few years, the power conversion efficiency (PCE) of the PSC has catapulted from 4% to above 22%, which represents one of the fastest developments in the field. The PSC band-gap tunability makes them interesting for use in tandem solar cells with other established solar cell technologies. This thesis focuses on exploring the photophysics of the perovskite material as well as the development of different perovskite preparation processes and materials for potential use in large-scale manufacture and tandem solar cell applications.

First, the photoconductivity of a perovskite film deposited on different metal oxide nanoparticle layers is investigated. The results show that the perovskite can generate free charge carriers without the presence of an electron acceptor.

Secondly, we constructed PSCs with a conducting carbon-nanotube film, as a replacement for both the hole-selective layer and the metallic back electrode, which yielded a PCE of 15.5%. Furthermore, we explored the preparation of semitransparent PSCs for tandem solar cells by using atomic-layer deposition (ALD) for depositing a thin electron-selective metal-oxide layer. We were successful using ALD directly on a perovskite layer without damage to the perovskite. Although the PSCs did not yield high PCE, the study marks a step in further development for direct ALD deposition onto the perovskite.

Finally, we developed two different methods concerning sustainable manufacture of PSCs. The first method was based on the synthesis of the mixed-ion (FAPbI3)0.87(MAPbBr3)0.17 perovskite in ambient air, which had hitherto only been possible in inert atmosphere. The best PSC was obtained by depositing the perovskite onto a 50°C warm substrate in ambient air yielding a PCE of 17.7%. In the second method, only non-hazardous solvents, water and isopropanol, were used in the synthesis of Cs0.1FA0.9Pb(I0.83Br0.17)3. It is the first publication of mixed inorganic and organic cation perovskite synthesis using a two-step preparation procedure with only non-hazardous solvents and the process yielded a PCE of 13.0%. The method allows for complete ionic control of the perovskite and further variation and improvements are therefore possible.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 83
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1628
Keywords
perovskite solar cells, perovskite, photoconductivity, carbon nanotubes, transparent contact, ambient processing, water-based
National Category
Physical Chemistry Energy Systems Nano Technology
Research subject
Chemistry with specialization in Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-340508 (URN)978-91-513-0229-4 (ISBN)
Public defence
2018-03-23, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2018-02-27 Created: 2018-01-31 Last updated: 2018-04-03

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Sveinbjörnsson, KáriKyi Thein, Nan KyiSvanström, SebastianYang, WenxingCappel, Ute B.Rensmo, HåkanBoschloo, GerritAitola, KerttuJohansson, Erik

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Sveinbjörnsson, KáriKyi Thein, Nan KyiSvanström, SebastianYang, WenxingCappel, Ute B.Rensmo, HåkanBoschloo, GerritAitola, KerttuJohansson, Erik
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