Time-resolved photoluminescence study of CuInS2/ZnS nanocrystals

Thi Kim Chi Tran, Quang Phuong Le, Quang Liem Nguyen, Liang Li and Peter Reiss

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