Perovskite solar cell doped with disulfonic functionalized ionic liquid and preparation method of perovskite solar cell

By adding disulfonic acid-functionalized ionic liquid PSO3HPyOTs to the perovskite precursor solution, Pb ions were anchored and crystallization was regulated, solving the efficiency and stability problems caused by defects in perovskite solar cells. This resulted in the preparation of highly efficient and stable perovskite thin films, with a 19% improvement in photoelectric conversion efficiency.

CN122138599APending Publication Date: 2026-06-02INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES +2
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Patent Information

Application Number
CN202610127071.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing perovskite solar cells contain iodine vacancies, lead vacancies, and residual lead iodide, which lead to carrier recombination, affecting device efficiency and long-term stability. Traditional passivation materials have limited effectiveness and suffer from solubility, toxicity, and thermal stability issues.

Method used

By adding the disulfonic acid-functionalized ionic liquid N-propylsulfonate pyridine p-toluenesulfonate (PSO3HPyOTs) to the perovskite precursor solution, uncoordinated Pb ions are anchored through Pb···O coordination, crystallization is regulated, and synergistic passivation of perovskite films is achieved, thus preparing high-quality perovskite light-absorbing layers.

Benefits of technology

It significantly improves the photoelectric conversion efficiency and long-term stability of perovskite solar cells, with a photoelectric conversion efficiency exceeding 23.55%, maintaining 80% of the initial efficiency under high humidity conditions, and significantly improving film stability and conductivity.

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Abstract

The invention relates to a perovskite solar cell doped with disulfonic functionalized ionic liquid and a preparation method thereof. According to the invention, by doping the disulfonic functionalized ionic liquid in the perovskite precursor solution, on one hand, the crystallization process of perovskite is effectively regulated and controlled, the residue of lead iodide is reduced, and the perovskite thin film with better crystallinity, larger and more uniform grain size and smoother surface is prepared, so that the stability of the perovskite thin film is improved; and on the other hand, the ionic liquid contains a disulfonic acid group, so that uncoordinated Pb ions can be anchored, ion migration can be inhibited, the defect state of the perovskite material can be passivated, the quality of the perovskite thin film can be remarkably improved, and the photoelectric conversion efficiency and long-term stability of the solar cell can be improved. Meanwhile, after perovskite film forming, the ionic liquid is mainly distributed on the upper interface and the lower interface in the perovskite film, synergistic passivation of the double interfaces of the perovskite film is achieved, and the photoelectric conversion efficiency and the long-term stability of the solar cell are further improved.
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