Silicon Solar Cells Achieve Theoretical Conversion Efficiency

- Sep 26, 2019-

An important research published online by the British magazine Nature and Energy on the 20th reported the first silicon solar cell with a 26% light conversion efficiency. The battery has been certified to achieve 26.3% conversion efficiency, indicating that the efficiency of silicon solar cells has reached a record high, and more efficient silicon solar panels will be available in the future.

According to the "Nature·Energy" article, by 2050, photovoltaic power will account for more than 20% of global primary energy demand. However, the current cost of solar power generation is still relatively high compared to 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 in further deployment of photovoltaic power.

The theoretical efficiency of silicon solar cells is about 29%, because 20% to 30% of the energy of incident light is transmission loss, about 30% is quantum loss, about 10% is carrier recombination, surface reflection loss and series resistance. Loss and so on.

This time, the researcher of Japan's Zhonghua Company, Ji Hexun and his colleagues, used industrial compatible processes to manufacture monocrystalline silicon solar cells, which are designed to increase the 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 - 29.1%, opening a door for the goal of efficient conversion of solar power and cost reduction.

The research team stressed that although the study broke the record of light conversion efficiency of silicon solar cells in the world to date, the assembly of individual cells into commercially viable solar panels requires further research.