Fullerene derivative, preparation method and application thereof, and tin-based perovskite solar cell

By doping the perovskite active layer of tin-based perovskite solar cells with fullerene derivatives, the problems of poor stability and low efficiency caused by excessively fast crystallization rate in tin-based perovskite solar cells have been solved, achieving higher photoelectric conversion efficiency and mechanical stability.

CN117143088BActive Publication Date: 2026-01-23HUAQIAO UNIVERSITY
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Patent Information

Application Number
CN202311118774.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-01
Publication Date
2026-01-23
Estimated Expiration
2043-09-01

AI Technical Summary

Technical Problem

Tin-based perovskite solar cells suffer from poor stability and low photoelectric conversion efficiency due to the excessively rapid crystallization rate of perovskite, which results in a large amount of residual stress and defects in the perovskite active layer. Furthermore, the highest conversion efficiency of flexible devices is only 8.56%.

Method used

Fullerene derivatives are doped into the perovskite active layer of tin-based perovskite solar cells. By forming coordination bonds between R and tin ions through alkenyl, four-membered cycloalkyl, or dithiocyclopentyl groups, the crystallization rate of perovskite is regulated and the lattice stress is reduced, while the electron extraction capability is improved.

Benefits of technology

This improved the stability and photoelectric conversion efficiency of tin-based perovskite solar cells, and enhanced the mechanical stability and defect passivation capability of the devices.

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Abstract

This invention relates to a fullerene derivative, its preparation method and application, and a tin-based perovskite solar cell photovoltaic device, belonging to the field of optoelectronic materials and devices technology. The fullerene derivative of this invention has the structure shown in Formula I; in Formula I, X... ‑ It is a halide ion or pseudohalogen ion; R is an alkenyl, four-membered cycloalkyl, or dithiocyclopentyl; Fu is C 60 C 70 C 84 Alternatively, it can be an embedded metallofullerene. In the fullerene derivatives of this invention, R is an alkenyl, a four-membered cycloalkyl, or a dithiocyclopentyl group. R can open double bonds or open rings to form polymers. Furthermore, the thiol group after ring opening of the dithiocyclopentyl group and the carbonyl group in the structure can form coordination bonds with divalent tin ions in tin-based perovskite solar cells, thereby regulating the crystallization rate of perovskite and reducing the lattice stress of perovskite. At the same time, the fullerene derivatives have good solubility, reducing the lattice stress generated by rapid crystallization of the perovskite active layer, and further improving the stability of tin-based perovskite solar cells.
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