Dalian Institute of Chemistry, Chinese Academy of Sciences prepares high-performance large-area perovskite solar cell modules

The cover image was produced by the Science Visualization Center of China Science Newspaper

Recently, Wang Kai, associate researcher of the thin film solar cell research group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Liu Shengzhong, a researcher team, used slit coating preparation technology and combined the surface redox strategy of the vacuum nickel oxide film to prepare high-performance large-area perovskite solar cell modules.

On July 21, 2022, the study was published in the journal Joule under the title “Surface redox engineering of vacuum-deposited NiOx for top-performance perovskite solar cells and modules.” The first authors of the work are Du Minyong, a doctoral student at the Dalian Institute of Chemicals, and Zhao Shuai, Chongqing University of Technology.

At present, the photoelectric conversion efficiency of laboratory-size perovskite solar cells has reached more than 25%, and the preparation of large-area perovskite cells and the promotion of their industrialization process have become one of the main development directions in this field. Although one of the important advantages of perovskite batteries is that they are compatible with the solution preparation route, in the preparation process of large-area devices, only one hundred nanometers thick perovskite layer is suitable for the preparation of the solution method, while the thickness of the charge transfer layer is only a few tens of nanometers, and it is difficult to prepare a uniform and non-porous large-area charge transport layer by the solution method at this stage.

In contrast, vacuum deposition technology is more controllable and more suitable for the preparation of ultra-thin large-size films. Therefore, Liu Shengzhong’s team proposed a strategy to construct a large-area battery by combining a vacuum-prepared charge transfer layer and a perovskite layer prepared by solution method. However, it was found in the study that the surface of the vacuum-prepared nickel oxide hole transport layer was relatively hydrophobic, which weakened the adhesion of the perovskite precursor, and a large number of high-priced nickel ions present on the surface of nickel oxide would decompose the perovskite, forming an interfacial barrier and causing a non-capacitive lag effect, which ultimately affected the performance and stability of the device.

In response to the above problems, the team proposed a simple surface redox engineering (SRE) to achieve the regulation of the surface properties of the electron beam evaporation nickel oxide film. It is found that SRE can effectively improve the wettability of nickel oxide surface and ensure the compatibility of vacuum preparation of nickel oxide and the preparation of perovskite in solution; At the same time, by reasonably adjusting the proportion of nickel ions in different valence states on the surface of nickel oxide films, the electrical performance of nickel oxide/perovskite interface can be improved and the interface stability can be improved. Finally, on small-area trans batteries prepared on rigid and flexible substrates, the photoelectric conversion efficiency reached 23.4% and 21.3%, respectively, and had excellent stability. In addition, based on earlier work (Advanced Materials, 2020), the research team successfully prepared a large-area perovskite battery module on a large-area substrate with an area of 156× 156 mm2, with an energy conversion efficiency of 18.6% and excellent stability. The surface redox engineering proposed in this work provides a design idea for combining vacuum-prepared charge transfer layers with perovskites prepared in solution, and is expected to promote the development of efficient and stable perovskite battery components.

The work has been funded by the Strategic Key Research Project of the Chinese Academy of Sciences, the National Natural Science Foundation of China, the Natural Science Foundation of Liaoning Province, the Dalian Science and Technology Star, the Dalian Institute of Chemicals Innovation Fund, the Dalian National Laboratory Cooperation Fund for Clean Energy of the Chinese Academy of Sciences, the National Key R&D Project, the 111 Project, and the Knowledge Innovation Project. (Source: Science Network)

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