Solliance reports that the consortium’s perovskite-based photovoltaics have achieved module-level aperture area conversion efficiency of 12.2% and world record cell-level conversion efficiency of 13.5%. The company used roll-to-roll (R2R) production processes. This latest record follows the consortium’s previous perovskite cell world record reported earlier this year. Perovskite-based solar cells promise high efficiency from a relatively simple production method.
Additionally, the consortium points out that they can be made into thin, lightweight and potentially semi-transparent modules that could be integrated into windows or curved surfaces. In March this year, Solliance demonstrated R2R processes for both the perovskite and electron transport layers of the cells that make up such modules. Solliance says that now after the group further optimized and re-validated these processes on its dual R2R coating line, the performance improved at both the cell and module level.
The consortium selected two foil zones for each R2R setting measuring about 10 meters in length with a good visual perovskite quality. They made 20 individual 0.1 cm2 solar cells in each zone. The maximum stabilized efficiency in one zone reached 13.5% (under maximum power point tracking conditions over 5 minutes), and in the second zone a maximum of 12.5% was reached.
They found that the average stabilized cell efficiency of the best performing zone was about 1% higher than the previously reported run in March 2017. All processing steps used low-cost materials and scalable processes at temperatures below 120degC.
“These results show that the developed R2R process is very reproducible over different runs in time, which is very important for future reliable manufacturability,” explained Pim Groen, Professor of SMART materials at the Technical University of Delft and Program Manager at Holst Centre/Solliance.