Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach

Saeed Shahbazi; Meng Yu Li; Amir Fathi; Eric Wei Guang Diau

doi:10.1021/acsenergylett.0c01190

Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach

Saeed Shahbazi, Meng Yu Li, Amir Fathi, Eric Wei Guang Diau^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

Applying a two-step procedure and solvent engineering, we fabricated a stable tin-based perovskite, formamidinium tin triiodide (FASnI3), solar cell for lead-free photovoltaic applications. The first step was deposition of a SnI2 layer with the solvent dimethyl sulfoxide; the second step was application of a cosolvent system containing hexafluoro-2-propanol (HFP), isopropyl alcohol (IPA), and chlorobenzene (CB) in a 5:5:2 ratio to deposit the FAI layer on the SnI2 layer. The traditional IPA solvent prevented the formation of a stable FASnI3 layer such that a stable device could not be fabricated. HFP was hence used to form hydrogen bonds with IPA and FAI to retard the crystal growth of FASnI3; CB served as the antisolvent. Ethylenediammonium dihypophosphite in the first step was an effective reducing agent to increase the efficiency of power conversion from ∼5% to ∼7% with great reproducibility and stability over 4000 h.

Original language	English
Pages (from-to)	2508-2511
Number of pages	4
Journal	ACS Energy Letters
Volume	5
Issue number	8
DOIs	https://doi.org/10.1021/acsenergylett.0c01190
State	Published - 14 Aug 2020

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title = "Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach",

abstract = "Applying a two-step procedure and solvent engineering, we fabricated a stable tin-based perovskite, formamidinium tin triiodide (FASnI3), solar cell for lead-free photovoltaic applications. The first step was deposition of a SnI2 layer with the solvent dimethyl sulfoxide; the second step was application of a cosolvent system containing hexafluoro-2-propanol (HFP), isopropyl alcohol (IPA), and chlorobenzene (CB) in a 5:5:2 ratio to deposit the FAI layer on the SnI2 layer. The traditional IPA solvent prevented the formation of a stable FASnI3 layer such that a stable device could not be fabricated. HFP was hence used to form hydrogen bonds with IPA and FAI to retard the crystal growth of FASnI3; CB served as the antisolvent. Ethylenediammonium dihypophosphite in the first step was an effective reducing agent to increase the efficiency of power conversion from ∼5% to ∼7% with great reproducibility and stability over 4000 h. ",

author = "Saeed Shahbazi and Li, {Meng Yu} and Amir Fathi and Diau, {Eric Wei Guang}",

year = "2020",

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doi = "10.1021/acsenergylett.0c01190",

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T1 - Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach

AU - Shahbazi, Saeed

AU - Li, Meng Yu

AU - Fathi, Amir

AU - Diau, Eric Wei Guang

PY - 2020/8/14

Y1 - 2020/8/14

N2 - Applying a two-step procedure and solvent engineering, we fabricated a stable tin-based perovskite, formamidinium tin triiodide (FASnI3), solar cell for lead-free photovoltaic applications. The first step was deposition of a SnI2 layer with the solvent dimethyl sulfoxide; the second step was application of a cosolvent system containing hexafluoro-2-propanol (HFP), isopropyl alcohol (IPA), and chlorobenzene (CB) in a 5:5:2 ratio to deposit the FAI layer on the SnI2 layer. The traditional IPA solvent prevented the formation of a stable FASnI3 layer such that a stable device could not be fabricated. HFP was hence used to form hydrogen bonds with IPA and FAI to retard the crystal growth of FASnI3; CB served as the antisolvent. Ethylenediammonium dihypophosphite in the first step was an effective reducing agent to increase the efficiency of power conversion from ∼5% to ∼7% with great reproducibility and stability over 4000 h.

AB - Applying a two-step procedure and solvent engineering, we fabricated a stable tin-based perovskite, formamidinium tin triiodide (FASnI3), solar cell for lead-free photovoltaic applications. The first step was deposition of a SnI2 layer with the solvent dimethyl sulfoxide; the second step was application of a cosolvent system containing hexafluoro-2-propanol (HFP), isopropyl alcohol (IPA), and chlorobenzene (CB) in a 5:5:2 ratio to deposit the FAI layer on the SnI2 layer. The traditional IPA solvent prevented the formation of a stable FASnI3 layer such that a stable device could not be fabricated. HFP was hence used to form hydrogen bonds with IPA and FAI to retard the crystal growth of FASnI3; CB served as the antisolvent. Ethylenediammonium dihypophosphite in the first step was an effective reducing agent to increase the efficiency of power conversion from ∼5% to ∼7% with great reproducibility and stability over 4000 h.

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JO - ACS Energy Letters

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Realizing a Cosolvent System for Stable Tin-Based Perovskite Solar Cells Using a Two-Step Deposition Approach

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