Doping boosts efficiency of CdTe cell: Empa study

Scientists at the Empa Institute in Switzerland claim to have achieved 11.5% conversion efficiency for a CdTe solar cell by doping it with copper.

The researchers improved on previous results of around 8% by using high-vacuum copper evaporation on substrate CdTe cells.

Tests on lab-scale superstrate CdTe cells have achieved 19.6% efficiencies but efforts to improve results for substrate CdTe cells that don’t require a transparent glass backing have been the focus of much research.

“People have tried to dope CdTe cells in substrate configuration before but failed time and again,” explains Ayodhya Nath Tiwari, head of Empa’s laboratory for thin-films and photovoltaics.

His team discovered that the amount of copper used had to be precisely controlled with too little failing to lift efficiency and too much “over doping” the cell.

By applying a mono-atomic thick layer of copper the team was able to boost efficiencies with a best result of 11.5% for a cell grown on metal foil and 13.6% for one grown on glass.

They are now focused on lifting the 11.5% figure to 15%.

Source: PV Tech

About Ritesh Pothan

Ritesh Pothan, is an accomplished speaker and visionary in the Solar Energy space in India. Ritesh is from an Engineering Background with a Master’s Degree in Technology and had spent more than a decade as the Infrastructure Head for a public limited company with the last 9 years dedicated to Solar and Renewable Energy. He also runs the 2 largest India focused renewable energy groups on LinkedIn - Solar - India and Renewables - India
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