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An important research report published online by the UK's “Natural Energy†magazine on the 20th reported the first silicon solar cell whose light conversion efficiency exceeded 26%. After being certified, this type of battery achieves a conversion efficiency of 26.3%, indicating that the efficiency of silicon solar cells has reached a historic high, and more efficient silicon solar panels will also be available in the future.
According to "Natural Energy" article estimates, by 2050, photovoltaic power will assume more than 20% of global primary energy demand. However, at present, the cost of solar power generation is still higher than other energy sources. Reducing the cost of power generation is one of the major development goals of related companies and organizations in the world. Therefore, improving the photoelectric conversion rate of silicon solar cells has become a key step for the further deployment of photovoltaic power.
The theoretical efficiency of silicon solar cells is about 29%, because in the energy of incident light, 20% to 30% is the transmission loss, about 30% is the quantum loss, about 10% is the carrier recombination, the surface reflection loss and the series resistance Loss and so on.
This time, researcher Ji Hexiontai and his colleagues at the Japanese Bell Chemicals Corporation used industrially compatible processes to fabricate monocrystalline silicon solar cells, whose design can simultaneously increase solar absorption and current conversion of the battery. According to the new method, the research team broke the previous record of 25.6% and increased the light conversion efficiency to 26.3%.
At the same time, the researchers also proposed a new method to achieve the theoretical conversion efficiency limit of silicon solar cells of 29.1%, which opened the door to achieving the goal of efficient conversion and cost reduction of solar energy.
The research team emphasized that although the study has broken the record of the light conversion efficiency of the world silicon solar cells to date, the assembly of individual cells into commercially viable solar panels still needs further research. (Reporter Zhang Mengran)
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