Recent Advances of Monolithic All-Perovskite Tandem Solar Cells: From Materials to Devices

Comprehensive Summary Organic-inorganic metal-halide perovskite solar cells (PerSCs) have achieved significant progresses due to their outstanding optoelectronic characteristics, and the power conversion efficiency (PCE) of single-junction PerSCs has been boosted from 3.8% to a certified 25.2%. However, the efficiency of single-junction cells is governed by the Shockley-Queisser (S-Q) radiative limit, and fabricating all-perovskite tandem solar cells is a particularly attractive method to break the S-Q limit. Since the bandgap of lead (Pb)-based mixed halide perovskite can be tuned from 1.55 eV to 2.3 eV, and the mixed tin (Sn)-Pb perovskites have bandgap of similar to 1.2 eV, these perovskites become the best candidates for the front and rear subcells of all-perovskite tandem device, respectively. In this review, we firstly summarize the current development progresses of two-terminal (2-T) all-perovskite tandem solar cells. For further optimizing the device performance, the wide bandgap mixed halide perovskites for front subcell, mixed Sn-Pb narrow bandgap perovskites for rear subcell, and the interconnection layer (ICL) of 2-T tandem device are then discussed. This review aims to open a pathway to realize highly efficient all-perovskite tandem solar cells.