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A Japanese solar company named Kaneka developed a thin-film solar cell made of silicon that increased conversion efficiency to 26.3%, 0.7% higher than the original highest conversion efficiency record of 25.6%.
The theoretical limit of the conversion efficiency of silicon-based solar cells is 29%, but in daily practice, the actual conversion efficiency is only around 20%. Kaneka's researchers looked at the lost energy between theory and practice in order to find ways to reach the theoretical limit of 29% conversion efficiency.
To minimize energy loss, the researchers used a thin-film heterojunction to create an 180.4-cm2 solar cell. A low-resistance electrode was placed on the back of the cell to maximize the amount of photons collected at the front. The front of the cell had a layer. Amorphous silicon and anti-reflective coating, protect the cell components and collect photons more efficiently.
The researchers said that the next step in the research is to assemble these single solar cells into a commercially available solar panel. It is not clear how much the cost of such a solar panel will be.
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