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October 16, 2018 Tuesday 12:34:11 PM IST

GenNext Solar Cells with Record-breaking efficiency invented

Science Innovations

For generating sustainable solar energy, the solar cells must not only have high power conversion efficiency but also must remain stable against adverse environmental conditions. With the record-breaking power conversion efficiencies (PCEs) of more than 23%, solar cells made from a category of compounds known as perovskite structures could be ideal for generating sustainable solar energy, if they weren’t thermally unstable.

However, perovskites are highly unstable with so called ABX3 structure, where A is caesium and methylammonium (MA) or formamidinium (FA), B is lead or tin and X is chlorine, bromine or iodine. Researchers replaced bromine with iodine and the Methylammonium (MA) with a combination of rubidium and caesium in perovskites. This replacement also made perovskites highly stable and efficient.

Researchers of the Adolphe Merkle Institute in Fribourg  to replace bromine with iodine and Methylammonium (MA) with a combination of rubidium and caesium, which resulted in power conversion efficiency (PCE) of 20.35%, one of the best-reported efficiencies yet for a non-MA perovskite solar cell.

Apart from solar cells, non-MA perovskites can also show great promise for other optoelectronics devices such as light-emitting diodes used in applications like solid-state lighting.

DOI: Science 10.1126/science.aat3583