Vacancies substitution induced interfacial dipole formation and defect passivation for highly stable perovskite solar cells

Detao Liu; Hualin Zheng; Yafei Wang; Long Ji; Hao Chen; Wenyao Yang; Li Chen; Zhi Chen; Shibin Li

doi:10.1016/j.cej.2020.125010

Vacancies substitution induced interfacial dipole formation and defect passivation for highly stable perovskite solar cells

Detao Liu, Hualin Zheng, Yafei Wang, Long Ji, Hao Chen, Wenyao Yang, Li Chen, Zhi Chen, Shibin Li

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

18 Scopus citations

Abstract

Although an efficient charge transport is essential to high-performance perovskite solar cells (PSCs), the serious charge trapping in perovskite films is still a barrier to improve the efficiency of PSCs. To overcome this issue, we efficiently suppress the charge trapping by using polar compound materials to reduce defects and improve the match of work functions in PSCs. 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF₄) is used to form an interfacial dipole layer and triphenylphosphine oxide (TPPO) is employed to passivate defects. The interfacial dipole layer not only reduces the surface work function of electron transport layers (ETLs), but also substitutes organic/Cs cation vacancies. Oxygen atoms in TPPO molecules fill anion vacancies on perovskite crystal surfaces. As a result, the power conversion efficiency (PCE) of the champion PSCs has been improved to 21.1% from 18.7%. The target PSCs retained 98.3% of its initial PCE after 214 days in dry air condition (relative humidity about 22% at 25 °C) due to the reduced defect density in perovskite.

Original language	English
Article number	125010
Journal	Chemical Engineering Journal
Volume	396
DOIs	https://doi.org/10.1016/j.cej.2020.125010
State	Published - Sep 15 2020

Bibliographical note

Funding Information:
This work was supported by National Natural Science Foundation of China (Grant Nos. 61874150 , 61421002 and 61574029 ), the Natural Science Foundation of Chongqing ( cstc2019jcyj-msxmX0824 ) and Chongqing Postdoctoral Science Special Foundation (No. Xm2017051 ). This work was also partially supported by University of Kentucky . The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. The authors declare no competing financial interests.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

Charge transfer
Perovskite solar cells
Triphenylphosphine oxide
Vacancies substitution
[BMIM]BF

ASJC Scopus subject areas

Chemistry (all)
Environmental Chemistry
Chemical Engineering (all)
Industrial and Manufacturing Engineering

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10.1016/j.cej.2020.125010

Cite this

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title = "Vacancies substitution induced interfacial dipole formation and defect passivation for highly stable perovskite solar cells",

abstract = "Although an efficient charge transport is essential to high-performance perovskite solar cells (PSCs), the serious charge trapping in perovskite films is still a barrier to improve the efficiency of PSCs. To overcome this issue, we efficiently suppress the charge trapping by using polar compound materials to reduce defects and improve the match of work functions in PSCs. 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) is used to form an interfacial dipole layer and triphenylphosphine oxide (TPPO) is employed to passivate defects. The interfacial dipole layer not only reduces the surface work function of electron transport layers (ETLs), but also substitutes organic/Cs cation vacancies. Oxygen atoms in TPPO molecules fill anion vacancies on perovskite crystal surfaces. As a result, the power conversion efficiency (PCE) of the champion PSCs has been improved to 21.1% from 18.7%. The target PSCs retained 98.3% of its initial PCE after 214 days in dry air condition (relative humidity about 22% at 25 °C) due to the reduced defect density in perovskite.",

keywords = "Charge transfer, Perovskite solar cells, Triphenylphosphine oxide, Vacancies substitution, [BMIM]BF",

author = "Detao Liu and Hualin Zheng and Yafei Wang and Long Ji and Hao Chen and Wenyao Yang and Li Chen and Zhi Chen and Shibin Li",

note = "Funding Information: This work was supported by National Natural Science Foundation of China (Grant Nos. 61874150 , 61421002 and 61574029 ), the Natural Science Foundation of Chongqing ( cstc2019jcyj-msxmX0824 ) and Chongqing Postdoctoral Science Special Foundation (No. Xm2017051 ). This work was also partially supported by University of Kentucky . The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. The authors declare no competing financial interests. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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AU - Liu, Detao

AU - Zheng, Hualin

AU - Wang, Yafei

AU - Ji, Long

AU - Chen, Hao

AU - Yang, Wenyao

AU - Chen, Li

AU - Chen, Zhi

AU - Li, Shibin

N1 - Funding Information: This work was supported by National Natural Science Foundation of China (Grant Nos. 61874150 , 61421002 and 61574029 ), the Natural Science Foundation of Chongqing ( cstc2019jcyj-msxmX0824 ) and Chongqing Postdoctoral Science Special Foundation (No. Xm2017051 ). This work was also partially supported by University of Kentucky . The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. The authors declare no competing financial interests. Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/9/15

Y1 - 2020/9/15

N2 - Although an efficient charge transport is essential to high-performance perovskite solar cells (PSCs), the serious charge trapping in perovskite films is still a barrier to improve the efficiency of PSCs. To overcome this issue, we efficiently suppress the charge trapping by using polar compound materials to reduce defects and improve the match of work functions in PSCs. 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) is used to form an interfacial dipole layer and triphenylphosphine oxide (TPPO) is employed to passivate defects. The interfacial dipole layer not only reduces the surface work function of electron transport layers (ETLs), but also substitutes organic/Cs cation vacancies. Oxygen atoms in TPPO molecules fill anion vacancies on perovskite crystal surfaces. As a result, the power conversion efficiency (PCE) of the champion PSCs has been improved to 21.1% from 18.7%. The target PSCs retained 98.3% of its initial PCE after 214 days in dry air condition (relative humidity about 22% at 25 °C) due to the reduced defect density in perovskite.

AB - Although an efficient charge transport is essential to high-performance perovskite solar cells (PSCs), the serious charge trapping in perovskite films is still a barrier to improve the efficiency of PSCs. To overcome this issue, we efficiently suppress the charge trapping by using polar compound materials to reduce defects and improve the match of work functions in PSCs. 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) is used to form an interfacial dipole layer and triphenylphosphine oxide (TPPO) is employed to passivate defects. The interfacial dipole layer not only reduces the surface work function of electron transport layers (ETLs), but also substitutes organic/Cs cation vacancies. Oxygen atoms in TPPO molecules fill anion vacancies on perovskite crystal surfaces. As a result, the power conversion efficiency (PCE) of the champion PSCs has been improved to 21.1% from 18.7%. The target PSCs retained 98.3% of its initial PCE after 214 days in dry air condition (relative humidity about 22% at 25 °C) due to the reduced defect density in perovskite.

KW - Charge transfer

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KW - Triphenylphosphine oxide

KW - Vacancies substitution

KW - [BMIM]BF

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Vacancies substitution induced interfacial dipole formation and defect passivation for highly stable perovskite solar cells

Abstract

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Keywords

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