Time-resolved photoluminescence study of CuInS2/ZnS nanocrystals

Abstract

The emission mechanism in ZnS-capped 3-nm CuInS2 nanocrystals was studied by using time-resolved photoluminescence (TRPL). A typical TRPL spectrum demonstrates two broad emission bands. The spectral shifts as functions of the excitation power density and delay times from the excitation moment prove that both emission bands originate from donor-acceptor pair recombinations. Moreover, the temperature-dependent TRPL measurement revealed the importance of trapping sites in the emission mechanism of CuInS2 nanocrystals. © 2010 Vietnam Academy of Science & Technology.