Shanghai Jiaotong University has made breakthrough progress in the field of perovskite batteries

Recently, Zhao Yixin, a researcher from the School of Environmental Science and Engineering at Shanghai Jiao Tong University, led the Renewable Energy Research Team to make continuous breakthroughs in the preparation and intrinsic mechanism research of high-performance solar cells. Journal of the American Chemical Society (SCI impact factor IF 11.444), "Journal of Physical Chemistry Letters" (SCI impact factor IF 6.7) and "Journal of Materials Chemistry A" (SCI impact factor IF 6.6) continuously published 4 In the paper on high-efficiency perovskite solar cell research, these original research results received widespread attention from the industry.

Current mainstream solar cells in the market are usually photovoltaic silicon cells. The crystal silicon used in this type of cell has complicated production processes, high production costs, and large energy consumption. The latest emerging perovskite solar cells use cheap lead, halogens and amine salts. These materials are extremely abundant on the earth and greatly reduce the cost of solar cell production.

At the same time, the production technology of perovskite solar cells is simple, and only the synthetic perovskite liquid is applied on a transparent conductive substrate to control the absorption spectrum of solar light by controlling the conditions for the preparation of perovskite, thereby achieving the control of the battery. The balance between photoelectric efficiency and light transmission. At the same time, perovskite solar cell films can be made into colorful solar cells, which are expected to be used as decorative materials in the construction industry. This will not only increase the beauty and artistic atmosphere of buildings, but also enable the use of clean energy. The production process of perovskite solar cells is similar to film painting, and the operation is simple and it is convenient for large-scale production. Due to its low cost and high efficiency, it has become a research hotspot in the global solar cell field in the past two years.

One of the difficulties in the study of perovskite solar cells is how to obtain a continuous, dense, high-quality lead-halide perovskite film layer. Shanghai Jiaotong University's renewable energy research team creatively used CH3NH3Cl as a morphological control agent to successfully prepare a smooth and dense perovskite layer, which solved this key technical problem.

The additive can simultaneously change the crystal growth of the spin-on perovskite and adjust the morphology of the produced perovskite film. This new method solves the problem that the conventional one-step perovskite film crystallization process is demanding and time consuming for temperature and humidity. The disadvantages of this method are to solve the adverse effects of lead iodide residues in the two-step precursors on battery efficiency. The photoelectric conversion efficiency of the high-quality mixed lead-halide perovskite CH3NH3PbI2Br prepared by the smooth and dense perovskite layer has reached the international advanced level. The relevant results were published in the international authoritative journal J. Am. Chem. Soc. (DOI: 10.1021/ja5071398) And J. Mater. Chem. A (DOI: 10.1039/C4TA05384B).

Another problem that needs to be solved in the study of perovskite solar cells is the effect of lead iodide in perovskite films on the performance of solar cells. Some research results have shown that the presence of lead iodide has an adverse effect on the efficiency of the battery, while other reports have shown that lead iodide can promote the efficiency of solar cells.

To further explore its intrinsic mechanism, the Shanghai Jiaotong University’s renewable energy research team studied the electron injection of perovskite batteries using femtosecond laser ultrafast spectroscopy, demonstrating that under certain circumstances, the presence of a small amount of lead iodide is beneficial to the improvement of cell efficiency. This research result provides guidance for the future impurity regulation of lead-halogenated perovskite solar cells. The relevant research results are published in the authoritative journal J. Am. Chem. Soc. (DOI:10.1021/ja504632z).

Since its inception, the Shanghai Jiaotong University’s renewable energy research team has been strongly supported by schools and colleges. It has quickly achieved first-class platform construction and has received funding from the National Natural Science Foundation, the National Youth 1000 Grants Program and the 985th project of the school. We have actively conducted close scientific research cooperation with international organizations such as the National Renewable Energy Laboratory and Case Western Reserve University.

In addition to the study of perovskite solar cells, the team also conducted research on environmental functional photovoltaic materials. The team hopes to work with Jiaotong University’s other scientific research teams to actively collaborate on perovskite solar cells and work together to create a bright future for green energy.

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