Finnish researchers increase efficiency solar cells black




Researchers at the Finnish Aalto University have the efficiency of black solar cells managed to increase to 22.1 percent. Thus the university will improve its own efficiency record by almost four percentage points.

The high conversion rate of 22.1 percent was able to be achieved with solar cells of black silicon with a nano-structure, together with a special alumina film which ensures that the solar cell is performing better. Also, the metal contacts have been integrated into the back of the cell. The film made surface recombination, the bottleneck of black silicon, could be reduced. Surface recombination causes by small errors in the material the atomic bonding between the atoms, as it were ‘loose’ will be hung so-called ” dangling bonds “.

Black solar cells are useful in northern regions because the black cells are better able to absorb solar radiation are from all over. The sun shines in these areas a large part of the year from a low angle, according to the researchers.

The goal is the technology to be applied to other cell structures, including thin, multi-crystalline solar cells. The cells in this study were manufactured using relatively impure p-silicon. The researchers think with pure n-silicon still be able to achieve higher yields. The maximum size of the cells now produced was 9 square centimeters. The hope is the wafers rapidly to scale up to industrial level.

The development of these cells continues in the Black-project of the European Union, where the photovoltaic technology is being developed together with the industry. The results of the study are in the journal Nature Nanotechnology.


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