Inserting a metal fluoride layer in multilayered perovskite–silicon tandem solar cells can stall charge enhance performance
Tandem solar cells that combine perovskite and silicon-based subcells in one device are expected to better capture and convert sunlight into electricity than their conventional single-junction silicon analogs at a lower cost. However, when sunlight strikes the perovskite subcell, the resulting pairs of electrons and positively charged holes tend to recombine at the interface between perovskite and the electron-transport layer.
Liu, De Wolf and coworkers systematically investigated the potential of other metal fluorides, such as magnesium fluoride, as interlayer materials at the perovskite/C60 interface of tandem cells. They thermally evaporated the metal fluorides on the perovskite layer to form an ultrathin uniform film with controlled thickness before adding C60 and top contact components. The interlayers are also highly transparent and stable, in line with the inverted p-i-n solar cell requirements.
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