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PHOTOVOLTAICS | MATERIALS


colleagues in Saudi Arabia built the organic solar cells and measured their properties,” said Mago- medov.


Herbicide boost


Anthopoulos was also involved in developing an unlikely sounding way of boosting solar cell efficiency – by adding small amounts of a well- known herbicide as an impurity. He and his team – including Yuanbao Lin -- used


diquat as a molecular donor dopant to enhance conversion efficiency of OPVs.


Photovoltaic devices typically have an n-type


region and a p-region – which have a net negative and positive electric charge, respectively. These charges can be achieved by adding impurities. The dopant was added to two organic material systems that have previously shown high photovoltaic performance. In one case, the power conversion efficiency was improved from 16.7 to 17.4%, while they attained a maximum efficiency of 18.3% in the other. This was possible because the dopant in- creased both the materials’ optical absorption. It makes diquat a promising choice for the next generation of organic solar cells, said the researchers. “The predicted maximum efficiency of the


organic solar cell is around 20%,” said Lin. Separate to this, other KAUST researchers have studied ‘heterojunctions’ – blends of light-respon- sive electron donor and acceptor materials. Here, the researchers discovered several reasons why non-fullerene acceptors (NFAs) work so well. It did this by monitoring the photophysical processes that influence charge generation in 23 different NFA-based systems. The team plans to design new


materials combining enhanced charge-generation efficiencies with lower energy losses. Silicon-based solar cells continue to dominate the


field, as they continue to outstrip OPVs in terms of efficiency and longevity. However – as can be seen from these examples – research teams are chipping away at these advantages, and are confident that they can help to develop commercial OPVs that will find their own niches – as well as competing head-on with traditional photovoltaic devices.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.kau.sewww.gu.sewww.liu.sewww.cam.ac.ukwww.ucsb.eduwww.strath.ac.ukwww.st-andrews.ac.ukwww.ktu.ltwww.kaust.edu.sa


Above: KAUST researchers have studied why non-fuller- ene acceptors (NFAs) work so effectively


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IMAGE: KAUST


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