Reducing exciton binding energy of antimony-based perovskites by improving the phase purity for efficient solar cells

films exhibited an increased dielectric response and reduced exciton binding energy, which are conducive to exciton dissociation and carrier transport. A champion efficiency of 3.42% was achieved with the optimized solar cell devices, which is one of the highest efficiencies reported for all-inorganic antimony-based PSCs. These findings provide new perspectives for exploring high-efficiency antimony-based PSCs.