The latest research progress on the stability of perovskite solar cells at Shanghai Jiaotong University

At 23:00 Beijing time on May 30, 2022, the Han Liyuan team of Shanghai Jiao Tong University published the latest progress in the stability of perovskite solar cells in the international high-level journal Nature Energy, entitled “In situ growth of graphene on both sides of a Cu–Ni alloy for perovskite solar cells with improved.” stability”。

Professor Han Liyuan and Assistant Professor Wang Yanbo are the corresponding authors of the paper, and doctoral students Lin Xuesong and master student Su Hongzhen and master’s students He Sifan and Song Yinan, master students of East China Normal University, are the co-first authors.

Metal halide perovskite solar cells have received widespread attention in the field of new energy because of their high efficiency and low cost. However, organic and inorganic hybridized perovskite ion crystals are prone to the movement (decomposition) of halogen ions under working conditions, and migrating ions are prone to negative reactions with functional layers (charge transport layers, electrode materials, etc.), which further accelerates the decomposition of perovskites and leads to functional layer failure, shortening device life. The above problems have become the bottleneck in the development of perovskite solar cell technology.

Recently, the latest progress in the stability of perovskite solar cells published by Han Liyuan’s team at Nature Energy is another progress after the previously published perovskite/charge transport layer stable heterostructure technology (Science 365, 687–691, 2019) published in Science. This work designed a new carbide alloy composite electrode and related interface layer material for perovskite solar cells, realizing efficient and stable perovskite devices.

The alloying of copper (nickel) while enhancing its own electrochemical stability, can easily adjust the work function through component engineering to suit different structures of perovskite solar cells. More importantly, copper-nickel alloys are ideal materials for in situ preparation of high-quality graphene, so that a physical barrier layer to external water, oxygen and internal atoms and ions can be formed on the upper and lower surfaces of the alloy electrodes. The composite electrode forms a good interface ohmic contact with the charge transfer layer through a thermoplastic adhesive layer with a conductive network, assisted by hot pressure, thus preparing an efficient and stable charge transfer layer/electrode heterostructure. Based on the good chemical inertness and excellent physical barrier characteristics of the composite electrode, the negative reaction inside the battery and the decomposition of perovskite are strongly suppressed. In the end, the perovskite device prepared by the team achieved a high efficiency of more than 24%, and the efficiency was almost attenuated after 5000 hours of continuous light conditions.

Figure 1: Regulation of graphene quality and layer count grown in situ by alloy electrodes

Figure 2: Perovskite solar cell device structure and performance

Figure 3: Device stabilization mechanism analysis

Figure 4: Stability of perovskite solar cells based on different electrodes

This achievement provides a new idea for the electrode design of perovskite solar cells, which is of great significance for promoting the industrialization of perovskite solar cells. Han Liyuan’s team undertook the sub-project “Preparation and System Research on Battery Closure for 10,000 Hours long life” of the National Key Research and Development Program of the Ministry of Science and Technology “Key Technologies for Perovskite Solar Cells with 10,000 Hours of Working Life”. The results at this stage have laid a solid foundation for the final achievement of the project target of 10,000 hours of stability. (Source: Science Network)

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