HZB researchers are used to boost the efficiency of silicon solar cells

Scientists at the Helmholtz-Zentrum Berlin incorporate layers of organic molecules into the solar cell to boost the theoretical limit for silicon solar cells of 29.3 percent due to physical material properties. These layers utilize a quantum mechanical process known as singlet exciton fission to split certain energetic light (green and blue photons) in such a way that the electrical current of the solar cell can double in that energy range.
The team around HZB researcher Klaus Lips »can make a silicon solar cell with a maximum quantum efficiency of 200 percent, and a theoretical efficiency limit of around 40 percent,« says Rowan MacQueen, an Australian researcher who joined the HZB team two years ago.

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