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Lead halide perovskite nanocrystals (NCs) are currently emerging as one ofthe most interesting solution processed semiconductors since they possess highphotoluminescence quantum yield (PLQY), and colour tunability through anionexchange reactions or quantum confinement. Here, we show efficient solar cellsbased on mixed halide (CsPbBrI2) NCs obtained via anion exchange reactions inambient conditions. We performed anion exchange reactions in concentrated NCsolutions with I-, thus inducing a PL red-shift up to 676 nm, and obtaining ahigh PLQY in film (65%). Solar cell devices operating in the wavelength range350-660 nm were fabricated in air with two different deposition methods. Thesolar cells display a photo-conversion efficiency of 5.3% and open circuitvoltage (Voc) up to 1.31V, among the highest reported for perovskite basedsolar cells with band gap below 2eV, clearly demonstrating the potential ofthis material.

High Open Circuit voltage solar cells based on bright mixed halide CsPbBrI2 perovskite nanocrystals synthesized under ambient air conditions