Citation: Feiyu Lin, Ying Yang, Congtan Zhu, Tian Chen, Shupeng Ma, Yuan Luo, Liu Zhu, Xueyi Guo. Fabrication of Stable CsPbI₂Br Perovskite Solar Cells in the Humid Air[J]. Acta Physico-Chimica Sinica, ;2022, 38(4): 200500. doi: 10.3866/PKU.WHXB202005007 shu

Fabrication of Stable CsPbI₂Br Perovskite Solar Cells in the Humid Air

Feiyu Lin ^{1, 2, 3} ,
Ying Yang ^{1, 2, 3,,} ,
Congtan Zhu ^{1, 2, 3} ,
Tian Chen ^{1, 2, 3} ,
Shupeng Ma ^{1, 2, 3} ,
Yuan Luo ^{1, 2, 3} ,
Liu Zhu ^{4, 5} ,
Xueyi Guo ^{1, 2, 3}

1.
School of Metallurgy and Environment, Central South University, Changsha 410083, China
2.
Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha 410083, China
3.
National & Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha 410083, China
4.
First Rare Materials Co., Ltd., Qingyuan 511517, Guangdong Province, China
5.
First Materials Co., Ltd., Qingyuan 511517, Guangdong Province, China

Corresponding author: Ying Yang, muyicaoyang@csu.edu.cn
Received Date: 5 May 2020
Revised Date: 2 June 2020
Accepted Date: 2 June 2020
Available Online: 8 July 2020
Fund Project: the National Natural Science Foundation of China 61774169the Fundamental Research Funds for the Central South University, China 2019zzts944the Fundamental Research Funds for the Central South University, China 502211922

Inorganic perovskite materials have gained considerable attention owing to their good thermal stability, high absorption coefficient, adjustable bandgap, and simple preparation. However, most inorganic perovskites are sensitive to water and need to be prepared under inert environments in a glove box, which increases their preparation cost. In this study, we used a simple one-step spin coating anti-solvent process to prepare CsPbI₂Br, which was then annealed in humid air (relative humidity < 35%) at 300 ℃ for 5 min with isopropanol as the anti-solvent. An inorganic perovskite solar cell with fluorine-doped tin dioxide/compact TiO₂/mesoporous TiO₂/CsPbI₂Br/hole transport materials/Ag structure was prepared. By varying the concentration of the mesoporous precursor, we controlled the thickness of mesoporous TiO₂ in order to investigate its effect on the properties of the perovskite films and devices. The X-ray diffraction (XRD) results confirmed the successful synthesis of CsPbI₂Br in humid air. Moreover, the thickness of the substrate affected the crystal growth orientation. The scanning electron microscopy results revealed that the thickness of the mesoporous titanium dioxide substrate affected the crystallization processing of CsPbI₂Br, resulting in the formation of compounds with different morphologies and phases. The ultraviolet-visible (UV-Vis) and photoluminescence spectra of the perovskite materials revealed that the substrate thickness affected their optical properties. With a decrease in the thickness of the mesoporous TiO₂ substrate, the bandgap of CsPbI₂Br increased slightly. At the substrate thickness of 145 nm, the defect density of state of CsPbI₂Br increased. At the optimum mesoporous titanium dioxide substrate thickness of 732 nm, the device showed the best power conversion efficiency of 8.16%. The electrochemical impedance spectroscopy measurements revealed that the devices prepared on thicker mesoporous layers showed better carrier extraction and transmission capabilities but higher interfacial charge recombination resistance, leading to a lower open-circuit voltage but higher current density. Thus, an increase in the thickness of the mesoporous substrate improved the photovoltaic performance of the devices. The stability of the CsPbI₂Br perovskite film improved with an increase in the mesoporous substrate thickness. The stability test results along with the UV-Vis and XRD analysis results showed that the perovskite film prepared on the 732 nm-thick substrate showed no significant structure change after being placed in humid air for 144 h. The stability of the perovskite solar cells was also investigated. The device with the 732 nm-thick substrate could maintain its original efficiency of 73% after exposure to air with relative humidity less than 35% for 72 h. Thus, inorganic perovskite solar cells could be successfully prepared in the humid air environment.
- Inorganic perovskite,
- Solar cell,
- Mesoporous layer thickness,
- Stability,
- Humid air preparation
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Fabrication of Stable CsPbI₂Br Perovskite Solar Cells in the Humid Air