Bromine doped perovskite/textured silicon heterojunction for mechanically stacked tandem solar cell

In order to achieve high-efficiency solar cells, a tandem structure with perovskite and silicon solar cells was introduced and concerned, recently. However, it was difficult to form perovskite top cell on “textured” silicon solar cell due to the in homogeneity layer of perovskite top cells by solution process. In this work, therefore, in order to combine perovskite solar cell as a top cell and “textured” silicon heterojunction (SHJ) solar cell as a bottom cell, the top and bottom cell were integrated into the two-terminal tandem solar cells by mechanically stacking as the first time. Moreover, energy bandgap of perovskite layer was controlled by containing bromine to achieve current matching between top and bottom cell.