The Paper reporter Jalillo
According to Chinese Academy of Sciences official website news on August 3, two institutes of the Chinese Academy of Sciences have successively made important progress in the field of perovskite solar cell research.
Recently, You Jingbi, a researcher at the Institute of Semiconductors, Chinese Academy of Sciences, led a team to publish a paper in Science, achieving a significant improvement in the thermal stability of perovskite materials at 85 degrees Celsius.
Dalian Institute of Chemical Physics has prepared high-performance large-area perovskite solar cell modules. The pictures in this article are all from the official website of the Chinese Academy of Sciences
Recently, associate researcher Wang Kai and researcher Liu Shengzhong of the thin-film solar cell research group of Dalian Institute of Chemical Physics, Chinese Academy of Sciences used slit coating Cloth preparation technology, combined with the surface redox strategy of vacuum nickel oxide thin films, is used to prepare high-performance large-area perovskite solar cell components. Relevant papers were published in the academic journal "Joule".
Based on the obtained perovskite material with high stability and extended light absorption, You Jingbi team developed a perovskite solar cell with a certified efficiency of 25.6%, which is the world's highest efficiency for single-junction perovskite solar cells currently published. .
subjected the battery devices to 1,000 hours of storage and accelerated aging at 85 degrees Celsius, and the results maintained 96% and 80% of the initial efficiency.
You Jingbi’s team found in their research that by introducing a small amount of rubidium chloride (RbCl) into the perovskite material, the common secondary phase PbI2 that causes perovskite instability can be transformed into a new thermal stability and chemistry Good stability (PbI2)2RbCl. By inhibiting PbI2,
eliminates the problem of energy band enlargement caused by the strong confinement of the perovskite/PbI2 interface, reduces the band gap of the perovskite material, and expands the range of solar light absorption.
Dalian Institute of Chemical Physics prepared high-performance large-area perovskite solar cell modules
This research simultaneously achieved high photoelectric conversion efficiency and high stability of perovskite solar cells, laying the foundation for the further development and industrialization of perovskite cells. a solid foundation.
According to news released by of the Dalian Institute of Chemical Physics, the photoelectric conversion efficiency of laboratory-sized perovskite solar cells has reached more than 25%. Preparing large-area perovskite cells and promoting their industrialization process has become a field in this field. one of the main development directions. However, at this stage, it is difficult to prepare a uniform and non-porous large-area charge transport layer using solution methods.
found in the study that the surface of the nickel oxide hole transport layer prepared in vacuum is relatively hydrophobic, which weakens the adhesion of the perovskite precursor liquid. At the same time, the large number of high-priced nickel ions present on the nickel oxide surface will decompose the perovskite and form an interface potential. barriers and lead to non-capacitive hysteresis effects, ultimately affecting device performance and stability.
In response to the above problems, Wang Kai and Liu Shengzhong’s team proposed a simple surface redox engineering to control the surface properties of electron beam evaporated nickel oxide films.
achieved photoelectric conversion efficiencies of 23.4% and 21.3% on small-area trans cells prepared on rigid and flexible substrates, respectively, and had excellent stability.
In addition, based on earlier work, the research team successfully prepared a large-area perovskite cell component on a large-area substrate with an area of 156×156 mm^2, with an energy conversion efficiency of 18.6% and excellent performance. stability.
This work is expected to promote the development of efficient and stable perovskite battery components.
Editor in charge: Wu Yuewei
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