By improving the manufacturing method of the perovskite solar cell metal halide light-absorbing material, Korean scientists have achieved an energy conversion efficiency of 22.1% for this type of solar cell, and the highest record of this type of cell conversion efficiency was 20.1%.
The light-absorbing material of perovskite solar cells is usually a lead or nickel halide, and its crystal structure is similar to that of perovskite. This type of light-absorbing material has excellent photoelectric properties and low manufacturing cost, and is a research hotspot in the field of solar power generation in recent years.
The National Institute of Science and Technology in Ulsan, Korea, issued a press release saying that the new method was developed jointly by the agency and the Korea Chemical Technology Research Institute and Hanyang University. The key is to reduce the structural defects of the light-absorbing material.
Tiny defects in the crystal structure of lead or nickel halides can hinder the conversion of light energy into electrical energy, which is a key factor in limiting the conversion efficiency of perovskite solar cells. The researchers added additional iodide ions to the organic cation solution as a raw material to produce a light-absorbing material with less crystal structure defects.
Experiments show that using this low-cost method to manufacture metal halide light-absorbing layers can improve the conversion efficiency of small-scale perovskite solar cells by two percentage points, and related results have been recognized by the National Renewable Energy Laboratory. Thesis was published in the United States. Science magazine.
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