Time-resolved photoluminescence properties of CuInS 2/ZnS nanocrystals: Influence of intrinsic defects and external impurities

Vamsi K. Komarala, Chuang Xie, Yongqiang Wang, Jian Xu, Min Xiao

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63 Scopus citations

Abstract

Photoluminescence (PL) lifetime studies of CuInS 2 nanocrystals (NCs) are carried out after synthesizing core-shell and compositionally variant structures using time-resolved PL spectroscopy. Long-lived excited state decay times are observed for the NCs, and decay times are very much dependent on the size of the CuInS 2 NCs. The emission bands are attributed to the surface (shorter PL lifetime) and defect (longer PL lifetime) related trap states, respectively. The decay dynamics of the CuInS 2 NC's excited-state carriers is very sensitive to the surface, intrinsic defects, and extrinsic impurities. The observed large Stokes shifts and broad PL spectra also reveal the involvement of the defect-related trapping sites in the emission process.

Original languageEnglish (US)
Article number124314
JournalJournal of Applied Physics
Volume111
Issue number12
DOIs
StatePublished - Jun 15 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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