NTU Singapore scientists have created a perovskite solar mini module with the highest recorded power conversion efficiency ever.
The NTU team adopted a common industrial coating technique called ‘thermal co-evaporation’ – which is mainly used to produce OLED TVs – and found that it can fabricate solar cell modules of 21 cm2 size with record power conversion efficiencies of 18.1 per cent.
According to the scientists, these are the highest recorded values reported for scalable perovskite solar cells.
“The best-performing perovskite solar cells have so far been realized in the laboratory at sizes much smaller than 1 cm2, using a solution-based technique, called ‘spin-coating’,” explains lead author and senior scientist at Energy Research [email protected] ([email protected]), Dr. Annalisa Bruno.
“However, when used on a large surface, the method results in perovskite solar cells with lower power conversion efficiencies. This is due to the intrinsic limitations that include defects and lack of uniformity over large areas, making it challenging for industrial fabrication methods.”
“By using thermal evaporation to form the perovskite layer, our team successfully developed perovskite solar cells with the highest recorded power conversion efficiency reported for modules larger than 10 cm2.”
“Our work demonstrates the compatibility of perovskite technology with industrial processes, and its potential for market entry. This is good news for Singapore, which is looking to ramp up the use of solar energy for its power needs.”
The scientists also utilized the same technique to fabricate colored semi-transparent versions of the perovskite solar cells and mini modules, and these were shown to achieve similar measures of power conversion efficiency across a whole range of different colors.
These results demonstrate the versatility of the thermal evaporation method in producing a variety of perovskite-based solar devices for a variety of optoelectronic applications.
The NTU team is now working on integrating perovskite and silicon solar cells to create a tandem solar cell.
They believe such a configuration could substantially increase the solar electricity production per unit area while keeping production costs low.
Image and content: NTU Singapore