Except for methylammonium bromide (MABr) purchased from Greatcell Solar Material, all reagents were purchased from Sigma-Aldrich. The organic and inorganic salt precursors were stored in a dry N2 glovebox, and all other reagents were stored in ambient conditions. The syntheses were carried out in ambient conditions under a fume hood.

MAPbBr3 PNCs were synthesized by adapting the protocol previously reported by Veldhuis et al. (Ref. 18). Briefly, a precursor stock solution was prepared by completely dissolving 117.4 mg of lead bromide (PbBr2) and 35.8 mg of MABr in 2 mL of N,N-dimethylformamide (DMF, 99.8% anhydrous). The different NCs were prepared by swift injection of this stock solution (150 μL) into an antisolvent solution under vigorous and homogeneous stirring. For the Hexyl-MAPbBr3 PNCs, the antisolvent solution was prepared by adding 1 mL of oleic acid (OAc, 70%), 1 mL of benzyl alcohol (BzOH, 99.8%), and 8 μL of hexylamine to 5 mL of toluene. For the Octyl-MAPbBr3 PNCs, the antisolvent solution was prepared by adding 1 mL of oleic acid (OAc, 70%), 1 mL of benzyl alcohol (BzOH, 99.8%), and 20 μL of octylamine to 5 mL of toluene. For the Oleyl-MAPbBr3 PNCs, the antisolvent solution was prepared by adding 1.5 mL of oleic acid (OAc, 70%), 1 mL of benzyl alcohol (BzOH, 99.8%), and 35 μL of oleylamine to 5 mL of toluene.

After the injection, a green/yellow suspension was obtained. Purification of the crude material was performed using two centrifugation-redispersion steps at 12000 rpm and 4000 rpm. Subsequently, the precipitated NCs were dispersed in 1.5 mL of anhydrous toluene and stored at 4 °C.

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