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In a breakthrough, scientists have set a new world record for fullerene-free polymer solar cells that are cheaper and more efficient. Polymer solar cells have in recent years emerged as a low-cost alternative to silicon solar cells.
In order to obtain high efficiency, fullerenes are usually required in polymer solar cells to separate charge carriers. However, fullerenes are unstable under illumination, and form large crystals at high temperatures.
Researchers led by Professor Jianhui Hou at the Chinese Academy of Sciences (CAS) developed a unique combination of a polymer called PBDB—T and a small molecule called ITIC.
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