High performance tandem perovskite-silicon solar cells with very large bandgap photoelectrodes

Nanostructured layers of metal oxides with very large bandgaps (E-g > 5 eV), such as ZrO2 and HfO2, were used as photoelectrodes in semitransparent perovskite solar cells (PSCs) with the device architecture of glass/FTO/c-TiO2/ZrO2(or HfO2)/CH3NH3PbI3/PTAA/PEDOT:PSS/FTO/glass.The obtained PSCs were used as top elements for manufacturing high-performance four-terminal tandem perovskite-silicon solar cells. The comparative analysis of photovoltaic parameters measured for PSCs, crystalline silicon (c-Si) solar cells and tandem PSC/c-Si solar cells demonstrated that the application of very large-bandgap materials allows to improve the PSC performance and to increase the efficiency of tandem PSC/c-Si solar cell up to similar to 24% in comparison with a standalone c-Si solar cell.

Automated summary

By utilizing nanostructured metal oxide layers as photoelectrodes in semitransparent perovskite solar cells, the performance of high-performance four-terminal tandem perovskite-silicon solar cells was improved, increasing the overall efficiency significantly.