Chinese Academy of Sciences Institute of Electrical Engineering prepares CdTe thin film solar energy with a conversion efficiency of 14.4%

Recently, the Compound Thin Film Solar Cell Research Group of the Institute of Electrical Engineering of the Chinese Academy of Sciences made new progress on CdTe polycrystalline thin-film batteries. The team has prepared a CdTe polycrystalline thin film with a thickness of only 2 μm on ordinary cheap glass, and has passed the solar photovoltaic power generation system of the Chinese Academy of Sciences. And the wind power system quality inspection center certification, its transformation efficiency reached 14.4%, from 12.68% conversion efficiency reported in 2012 has gone a step, which marks the electrician where CdTe thin film solar cell research has made important progress.

CdTe is a direct bandgap semiconductor with a bandgap width of 1.45 eV at room temperature, and the bandgap value closely matches the solar spectrum. The CdTe absorption coefficient is greater than 104/cm, and it requires only 1 μm to absorb more than 99% of visible light with a wavelength less than 826 nm. The thickness is only 1/100th of the thickness of the silicon solar cell, the production cycle is short, the cost is low, and it is suitable for large-scale production. Therefore, thin film solar cells represented by CdTe thin-film solar cells have received much attention from research and industry due to their high conversion efficiency, low cost, and high stability.

In February of this year, the First Solar Company adopted the high-temperature preparation method of the vapor transport method to convert the small-area CdTe solar cell to 20.4%, which is the same as the polysilicon cell. In March, the total area efficiency of the module reached 17.0%. The production cost of this technology was also first reduced to $0.55/Wp, which is the lowest cost solar cell technology, but its scale production process technology has been monopolized by a small number of US companies. In addition, the highest efficiency of CdTe polycrystalline thin-film batteries fabricated by magnetron sputtering using low temperature fabrication methods was maintained by the University of Toledo, USA, and the conversion efficiency was 14.5%.

This time, without the use of a high-resistance layer, the electrician used a national production equipment and raw materials to prepare a CdTe battery with a conversion efficiency of 14.4%, which fully proved that as long as the research and development of the device preparation technology, it can be done abroad. The same level. This research result has laid a foundation for the research and industrialization of China's CdTe thin-film solar cells, which will enable China to make great progress in the industrialization of CdTe cells.

The above work has received strong support from the Chinese Academy of Sciences’ 100-person plan for selective support and the Institute’s research fund.

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