Enhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)2 in perovskite and dye-sensitized solar cells

William H. Nguyen; Colin D. Bailie; Eva L. Unger; Michael D. McGehee

doi:10.1021/ja504539w

Enhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)₂ in perovskite and dye-sensitized solar cells

William H. Nguyen, Colin D. Bailie, Eva L. Unger, Michael D. McGehee

Stanford University

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

Abstract

2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)₂, as a facile means of controllably increasing the conductivity of spiro-OMeTAD up to 10^-3 S cm^-1 without relying on oxidation in air. Spiro(TFSI)₂ enables the first demonstration of solid-state dye-sensitized solar cells fabricated and operated with the complete exclusion of oxygen after deposition of the sensitizer with higher and more reproducible device performance. Perovskite-absorber solar cells fabricated with spiro(TFSI)₂ show improved operating stability in an inert atmosphere. Gaining control of the conductivity of the HTM in both dye-sensitized and perovskite-absorber solar cells in an inert atmosphere using spiro(TFSI)₂ is an important step toward the commercialization of these technologies.

Original language	English
Pages (from-to)	10996-11001
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	136
Issue number	31
DOIs	https://doi.org/10.1021/ja504539w
Publication status	Published - 2014 Jul
Externally published	Yes

Subject classification (UKÄ)

Materials Chemistry

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title = "Enhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)2 in perovskite and dye-sensitized solar cells",

abstract = "2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)2, as a facile means of controllably increasing the conductivity of spiro-OMeTAD up to 10-3 S cm-1 without relying on oxidation in air. Spiro(TFSI)2 enables the first demonstration of solid-state dye-sensitized solar cells fabricated and operated with the complete exclusion of oxygen after deposition of the sensitizer with higher and more reproducible device performance. Perovskite-absorber solar cells fabricated with spiro(TFSI)2 show improved operating stability in an inert atmosphere. Gaining control of the conductivity of the HTM in both dye-sensitized and perovskite-absorber solar cells in an inert atmosphere using spiro(TFSI)2 is an important step toward the commercialization of these technologies.",

author = "Nguyen, {William H.} and Bailie, {Colin D.} and Unger, {Eva L.} and McGehee, {Michael D.}",

year = "2014",

month = jul,

doi = "10.1021/ja504539w",

language = "English",

volume = "136",

pages = "10996--11001",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "The American Chemical Society (ACS)",

number = "31",

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T1 - Enhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)2 in perovskite and dye-sensitized solar cells

AU - Nguyen, William H.

AU - Bailie, Colin D.

AU - Unger, Eva L.

AU - McGehee, Michael D.

PY - 2014/7

Y1 - 2014/7

N2 - 2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)2, as a facile means of controllably increasing the conductivity of spiro-OMeTAD up to 10-3 S cm-1 without relying on oxidation in air. Spiro(TFSI)2 enables the first demonstration of solid-state dye-sensitized solar cells fabricated and operated with the complete exclusion of oxygen after deposition of the sensitizer with higher and more reproducible device performance. Perovskite-absorber solar cells fabricated with spiro(TFSI)2 show improved operating stability in an inert atmosphere. Gaining control of the conductivity of the HTM in both dye-sensitized and perovskite-absorber solar cells in an inert atmosphere using spiro(TFSI)2 is an important step toward the commercialization of these technologies.

AB - 2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenylamine)-9, 9′-spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)2, as a facile means of controllably increasing the conductivity of spiro-OMeTAD up to 10-3 S cm-1 without relying on oxidation in air. Spiro(TFSI)2 enables the first demonstration of solid-state dye-sensitized solar cells fabricated and operated with the complete exclusion of oxygen after deposition of the sensitizer with higher and more reproducible device performance. Perovskite-absorber solar cells fabricated with spiro(TFSI)2 show improved operating stability in an inert atmosphere. Gaining control of the conductivity of the HTM in both dye-sensitized and perovskite-absorber solar cells in an inert atmosphere using spiro(TFSI)2 is an important step toward the commercialization of these technologies.

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JO - Journal of the American Chemical Society

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ER -

Enhancing the hole-conductivity of spiro-OMeTAD without oxygen or lithium salts by using spiro(TFSI)₂ in perovskite and dye-sensitized solar cells

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