Ningbo Materials made significant progress in solar cell research

On July 20th, Nature Photonics, an international academic journal, reported on the organic solar materials and device team led by Ge Ziyi, the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences. Important research advances in the field of batteries (Nature Photonics, Year published: 2015, 9, 520–524. DOI: doi:10.1038/nphoton.2015.126).

Organic solar cells have great potential for application in portable electronic devices, photovoltaic building integration and military fields due to their advantages of light weight, low cost, and easy preparation of flexible cells in large areas, and have become an important direction for the development of solar cells. At present, the main factors restricting the commercial application of organic solar cells are two major problems of efficiency and stability. For organic photovoltaic devices, the interface modification layer plays an extremely important role, not only can optimize the active layer absorption and adjust its light field distribution, but also can adjust the charge collection barrier of the electrode to achieve effective transmission of photogenerated carriers. One of the effective means to increase the efficiency and stability of organic solar cells.

The organic optoelectronic materials and device research team has synthesized a non-conjugated small organic molecule with a simple preparation process and low cost that can be wet-processed with alcohol solvents as the cathode interface of organic solar cells, replacing the traditional Ca, Mg, which requires vapor deposition. Interface materials such as LiF or organic conjugated polymers with complex structures are used for interface control of batteries. The team members used this type of material to optimize the interface and structure of organic solar cell devices, and improved the photoelectric conversion efficiency of single-junction positive polymer solar cells to 10.02%, which exceeded the 10% efficiency bottleneck of single-junction organic solar cells. Compared with widely used Ca/Al electrodes, the photoelectric conversion efficiency of the battery has increased by nearly 25%. The relevant results have been certified by the National Photovoltaic Quality Inspection Center and it is one of the most efficient single-junction organic solar cells to be certified publicly. It has been highly evaluated by reviewers of Nature Photonics and believes that this research result is “very important for polymer solar cells”. "Contribution" has important application potential in low-cost, large-area preparation of organic solar cells.

The above work was supported by the National Natural Science Foundation of China (51273209, 5141140244), the International Cooperation Project of the Chinese Academy of Sciences (GJHZ1219) and the Ningbo International Cooperation Project (2012D10009, 2013D10013).

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