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According to the report of the Physicist Organization Network on January 8 (Beijing time), scientists at the University of Nottingham, USA, have discovered a cheap inorganic material that can replace the expensive organic hole conductors in perovskite solar cells. Efficient solar cells are cheaper. Related papers were published in the Journal of the American Chemical Society.
Perovskite solar cells are among the most promising photovoltaic technologies today. Their theoretical conversion efficiency is up to 50%, twice the conversion efficiency of solar cells on the market, and can significantly reduce the cost of solar cells. Although perovskite materials are relatively inexpensive, the use of organic materials for the production of solar cells requires the use of an organic hole-conducting polymer called spiro-OMeTAD. Its market price is more than 10 times that of gold.
In the new study, Jeffery Chris, Raymond Fung, and Prasty Cartem of the University of Notre Dam at the United States found that inorganic hole-conducting materials made of copper iodide can replace spiro-OMeTAD.
Chris said: "The newly discovered inorganic hole-conducting materials are much cheaper than the previous alternative materials and are expected to further reduce the manufacturing cost of such solar cells."
Perovskite is a kind of material with a specific crystal structure. For the manufacture of solar cells, this structure has natural advantages: higher charge carrier mobility and better light diffusion properties, making the energy in the photoelectric conversion process The loss is extremely low. Although copper iodide can be used as a hole conductor in perovskite solar cells, it has been proved so far, but copper-based conductors were previously considered to be able to play an important role in dye-sensitized solar cells and quantum dot solar cells. The force is their excellent electrical conductivity. The conductivity of the copper iodide conductor is two orders of magnitude higher than that of spiro-OMeTAD, which allows it to achieve a higher fill factor and also determines the greater power available for solar cells made with it. However, the current research results show that the perovskite solar cell containing copper iodide is temporarily inferior to the original technology in conversion efficiency. Researchers believe this may be related to its lower voltage. This point is expected to be compensated by lowering its higher reorganization rate in the future.
The researchers found that copper iodide solar cells also showed an advantage, that is, its good stability. The experimental results show that after two hours of continuous light, the current of the copper iodide solar cell did not decrease at all, while the current generated by the spiro-OMeTAD solar cell decreased by 10%. This is crucial for solar cells. Chris said that in the next step they will optimize the experimental steps so that they can achieve higher conversion efficiency.
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