Oxygen-Exposure Induced Rapid Oxidation of Spiro-OMeTAD in CsPbIBr₂ Perovskite Solar Cells

Authors

Wei-Guo Wang, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Department of Physics, College of Physical Science and Technology,Xiamen University, Xiamen 361005, Fujian, China;
Tian Bai, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Department of Physics, College of Physical Science and Technology,Xiamen University, Xiamen 361005, Fujian, China;
Gao-Fei Xue, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Department of Physics, College of Physical Science and Technology,Xiamen University, Xiamen 361005, Fujian, China;
Mei-Dan Ye, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Department of Physics, College of Physical Science and Technology,Xiamen University, Xiamen 361005, Fujian, China;Follow

Corresponding Author

Mei-Dan Ye(mdye@xmu.edu.cn)

Abstract

2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (Spiro-OMeTAD) is the most widely used hole transport material in perovskite solar cells (PSCs). However, its oxidation in the air takes a long time and results in the attack of perovskite by water. In this regard, we performed the oxidation process of Spiro-OMeTAD in oxygen, where perovskite can be protected from water, guaranteeing the integrity of perovskite. It was demonstrated that the champion Spiro-OMeTAD based CsPbIBr₂ PSCs after oxygen oxidation achieved a 7.19% power conversion efficiency (PCE), showing a higher PCE than 6.29% of the champion device oxidized in air. A series of electrochemical characterization methods were applied to investigate the performances of the different cell devices under different oxidation conditions. It was revealed that the oxygen oxidation enabled to enhance the hole conductivity of Spiro-OMeTAD, reduce the charge recombination and improve the charge transfer efficiency in PSCs. Moreover, the device with oxygen oxidation had a higher average efficiency and greater stability. This method makes the devices have better repeatability, which provides a reliable idea for the commercial development of PSCs.

Graphical Abstract

Keywords

perovskite, Spiro-OMeTAD, rapid oxidation, CsPbIBr2

DOI Link

https://doi.org/10.13208/j.electrochem.201249

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2021-04-28

Online Available Date

2021-03-20

Revised Date

2021-03-17

Received Date

2021-02-04

Recommended Citation

Wei-Guo Wang, Tian Bai, Gao-Fei Xue, Mei-Dan Ye. Oxygen-Exposure Induced Rapid Oxidation of Spiro-OMeTAD in CsPbIBr₂ Perovskite Solar Cells[J]. Journal of Electrochemistry, 2021 , 27(2): 216-226.
DOI: 10.13208/j.electrochem.201249
Available at: https://jelectrochem.xmu.edu.cn/journal/vol27/iss2/3