Perovskite solar cell using perfluoro additive and method of manufacturing the same

By introducing perfluorinated additives into the perovskite precursor solution, the wettability and crystallization control of the perovskite film were improved, solving the uniformity and quality problems of perovskite films in large-area coating, and enhancing the photoelectric conversion efficiency and stability.

CN122373591APending Publication Date: 2026-07-10SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Filing Date
2026-03-19
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing technologies, perovskite thin films are difficult to spread evenly during large-area coating, resulting in defects such as holes and streaks, which affect the high-quality film formation and performance consistency of the components, and the crystallization process is difficult to control effectively.

Method used

High-quality perovskite thin films are prepared by using perfluorinated additives such as perfluorotoluene and perfluoronaphthalene to form hydrogen bonds with FA+/MA+ in the perovskite precursor solution, thereby inhibiting cation thermal decomposition, improving substrate surface wettability, and regulating the crystallization rate.

Benefits of technology

It improves the solubility and spreadability of perovskite thin films, reduces defects, enhances carrier transport, and improves photoelectric conversion efficiency and stability, especially increasing PCE to 20.63% and 19.18% in small-area and large-area modules, respectively.

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Abstract

This invention discloses a perovskite solar cell using a perfluorinated additive and its fabrication method. The cell comprises, from bottom to top, a substrate electrode, a hole transport layer, a perovskite light-absorbing layer, an electron transport layer, a hole blocking layer, and a metal electrode. The perovskite light-absorbing layer is prepared by dissolving a precursor material of the perovskite light-absorbing layer in a solvent and then adding a perfluorinated additive, wherein the perfluorinated additive is perfluorotoluene or perfluoronaphthalene. The precursor material of the perovskite light-absorbing layer is (FA... X MA Y Cs Z The perovskite crystals are PbI3, where X = 0.8~1.2, Y = 0.1~0.3, Z = 0.01~0.05, and X+Y+Z=1. This invention utilizes perfluorotoluene and perfluoronaphthalene to regulate the crystallization rate of perovskite crystals, thereby improving the wettability of the perovskite solution on a SAM substrate, enhancing the thermal stability of the perovskite film, adjusting the surface tension of the perovskite precursor solution, improving film quality and surface coverage, and ultimately increasing the photoelectric conversion efficiency of perovskite solar cells, enabling the fabrication of large-area perovskite solar cells.
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