High-performance wide bandgap perovskite solar cells fabricated in ambient high-humidity conditions

Lead-halide perovskite solar cells (PSCs) are currently the most promising emergent thin-film photovoltaic technology, having already reached power conversion efficiency (PCE) levels of state-of-the-art wafer-based silicon cells. The class of wide bandgap PSCs has also demonstrated high PCE values, thus becoming highly attractive for top sub-cells in tandem devices constructed with silicon or other types of bottom sub-cells. In this study, wide bandgap double-halide (Cs(0.17)FA(0.83)PbI(3-x)Br(x)) perovskite absorbers were developed with different bromine content, aiming to obtain bandgap values between 1.66 to 1.74 eV, by a glovebox-free (ambient) procedure. Low-cost inorganic materials, i.e. TiO2 and CuSCN, were used for the electron and hole transport layers, respectively. The 1.70 eV bandgap perovskite resulted in the highest reproducibility and stability (>80% initial PCE after 3500 hours) properties of the PSCs, remarkably attaining 16.4% PCE even with ambient and high humidity (similar to 70%) fabrication conditions.

Automated summary

Wide bandgap double-halide perovskite absorbers were developed with different bromine content to achieve bandgap values between 1.66 to 1.74 eV, showing high reproducibility and stability in PSCs with a remarkable PCE of 16.4% even under ambient and high humidity conditions.