Fig. 1.

Scenario of interfacial excitation transfer processes. Energy alignment and possible pathways for plasmon-hot electron conversion in Ag–CsPbBr₃ hybrid nanocrystals (NCs). a Scheme of the conventional plasmon-induced hot-electron transfer process (PHET). A photoexcited plasmon (SP) decays into an electron–hole pair (solid and open circles in the dashed ellipsoid) in the Ag nanoparticle, followed by the transfer of hot electron into the conduction band (CB) of the CsPbBr₃ NC as indicated by the solid line with an arrowhead. b Scheme of the plasmon-induced charge-transfer transition process (PICTT). The plasmon decays by creating an electron in the CB of the CsPbBr₃ NC and a hole in the Ag nanoparticle. c Scheme of the plasmon-induced resonant energy transfer process (PIRET). The plasmon decays with simultaneous formation of an electron in the CB and a hole in the valence band (VB) of the CsPbBr₃ NC. The violet and orange wave lines indicate the optical excitation and Landau damping processes of plasmon in the Ag nanoparticle. The Fermi level of the Ag nanoparticle is labeled as E_F. d Proposed formation mechanism of Ag–CsPbBr₃ hybrid NCs. AgBr grown on the surface of CsPbBr₃ NCs decomposes to form small Ag nanoparticles under ultraviolet illumination whose sizes increase after prolonged irradiation via Ostwald ripening process