The synergy between the CsPbBr nanoparticle surface and the organic ligand becomes manifest in a demanding carbon-carbon coupling reaction.

We demonstrate here the suitability of CsPbBr nanoparticles as photosensitizers for a demanding photoredox catalytic homo- and cross-coupling of alkyl bromides at room temperature by merely using visible light and an electron donor, thanks to the cooperative action between the nanoparticle surface and organic capping.