Recombination dynamics in CsPbBr3 nanocrystals: role of surface states

We present a detailed experimental investigation of the carrier recombination dynamics in CsPbBr3 films by means of picosecond time-resolved photoluminescence. Temperature-dependent measurements show that carrier capture and release from the nanocrystals (NCs) surfaces determine the observed increase of the recombination lifetime with the increase of temperature. This result opens the way to probe the surface of the NCs, which is of the utmost relevance for optoelectronic applications, and to eventually give feedback for surface treatments of NCs. (C) 2017 Optical Society of America