The latest Science from East China University of Science and Technology: Only 3% attenuation after 3670 hours!

2025/8/30 10:31:17 admin 阅读 250【次】

The team of Yang Shuang and Hou Yu from East China University of Science and Technology published a research paper titled "Graphene-polymer reinforcement of perovskite lattices for durable solar cells" in the journal Science. Li Qing is the first author, and Yang Shuang and Hou Yu are co-corresponding authors.

Key Highlights: This paper enhances the mechanical properties of perovskite films by integrating a polymer-coupled monolayer graphene interface, tripling their modulus and hardness. The synergistic effect of graphene and polymethyl methacrylate (PMMA) limits light-induced lattice expansion, reducing the lattice deformation rate from 0.31 to 0.08%. After more than 3670 hours of maximum power point tracking at 90°C and exposure to full-spectrum air quality 1.5 (AM 1.5 G) sunlight, the solar cell device maintained over 97% of its initial power conversion efficiency.

As a key component of photovoltaic cells, perovskite materials exhibit typical soft lattice properties. They are susceptible to chemical decomposition and structural degradation under environmental factors such as water, oxygen, light, high temperature, and electric fields, resulting in a significant drop in device efficiency and limiting the lifetime of the solar cell.

In view of this, the Yang Shuang & Hou Yu team at East China University of Science and Technology assembled a single-layer graphene sheet onto the surface of a perovskite film through a polymethyl methacrylate (PMMA) polymer interface coupling method, thereby achieving a highly uniform and multifunctional integration of the two. Thus, a new perovskite solar cell device was formed. Thanks to the excellent mechanical properties of graphene and the coupling effect of the polymer, the modulus and hardness of the perovskite film increased by two times, and the dynamic lattice expansion effect under light conditions was significantly limited. Studies have shown that the graphene-polymer bilayer structure reduces the lattice deformation rate from +0.31% to +0.08%, effectively reducing the material damage caused by expansion near the grain boundaries. By combining dynamic structural evolution experiments and computational models, it was verified that this coupled interface structure can effectively suppress lattice deformation and lateral ion diffusion under working conditions, thereby ensuring the long-term stability of the perovskite device in environments such as light, high temperature and vacuum. At 90°C, exposed to full-spectrum air quality 1.5 (AM 1.5 G) sunlight, and subjected to maximum power point tracking for over 3670 hours, the solar cell device maintained over 97% of its initial photoelectric conversion efficiency.

This research, through the use of a graphene-polymer coupling interface, achieved a breakthrough in the operating life of perovskite photovoltaics. It revealed the previously unknown key factor in photovoltaic performance degradation—the "photomechanically induced decomposition effect." This research provides a fundamental understanding of the dynamic structural damage that occurs in perovskite films during practical applications and the principles of mechanical strengthening regulation. This research provides a new solution for overcoming stability bottlenecks and promoting the industrial production and application of perovskite devices.

Source：https://www.science.org/doi/10.1126/science.adu5563

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The latest Science from East China University of Science and Technology: Only 3% attenuation after 3670 hours!

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