Interface Defects Dependent on Perovskite Annealing Temperature for NiOX-Based Inverted CsPbI2Br Perovskite Solar Cells

Zhaoxuan Huang; Nan Tian; Shiyu Duan; Jicheng Zhang; Disheng Yao; Guoyuan Zheng; Yanhan Yang; Bing Zhou

doi:10.1002/cssc.202301722

Interface Defects Dependent on Perovskite Annealing Temperature for NiO_X-Based Inverted CsPbI₂Br Perovskite Solar Cells

ChemSusChem. 2024 Mar 15:e202301722. doi: 10.1002/cssc.202301722. Online ahead of print.

Authors

Zhaoxuan Huang¹, Nan Tian^{1

2}, Shiyu Duan¹, Jicheng Zhang¹, Disheng Yao^{1

2}, Guoyuan Zheng^{1

2}, Yanhan Yang³, Bing Zhou^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, 12 Jiangan Road, Qixing District, Guilin, Guangxi, 541004, P. R. China.
² Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, 12 Jiangan Road, Qixing District, Guilin, Guangxi, 541004, P. R. China.
³ School of Science, Xi'an University of Posts and Telecommunications, 618 West Chang'an Street, Chang'an District, Xi'an, Shaanxi, 710121, P. R. China.

PMID: 38487956
DOI: 10.1002/cssc.202301722

Abstract

Nickel oxide (NiO_X) is an ideal inorganic hole transport material for the fabrication of inverted perovskite solar cells owing to its excellent optical and semiconductor properties. Currently, the main research on developing the performance of NiO_X-based perovskite solar cells focuses on improving the conductivity of NiO_X thin films and preventing the redox reactions between metal cations (Ni³⁺ on the surface of NiO_X) and organic cations (FA⁺ or MA⁺ in the perovskite precursors) at the NiO_X/perovskite interface. In this study, a new type of interface defects in NiO_X-based CsPbI₂Br solar cells is reported. That is the Pb²⁺ from CsPbI₂Br perovskites can diffuse into the lattice of NiO_X surface as the annealing temperature of perovskites changes. The diffusion of Pb²⁺ increases the ratio of Ni³⁺/Ni²⁺ on the surface of NiO_X, leading to an increase in the density of trap state at the interface between NiO_X and perovskites, which eventually results in a serious decline in the photovoltaic performance of solar cells.

Keywords: Hole transport layer; Interface defect; Nickel oxide; Perovskite.

Abstract

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