The effect of spatial distribution of Zn vacancies in ZnS quantum dots on optical absorption spectra

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Pimachev A., Proshchenko V., Horoz S., Sahin Ö., Dahnovsky Y.

SOLID STATE COMMUNICATIONS, cilt.257, ss.47-49, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 257
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.ssc.2017.04.004
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.47-49
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

In this work we propose how to identify the location and spatial distribution of Zn vacancies in ZnS quantum dots (QDs). The experiments reveal a peak shift in absorption spectra towards the lower energies (about 0.1 eV) in the presence of Zn vacancies. To explain such a shift we computationally study the absorption spectra when Zn vacancies are localized in the core, on the surface, and both in the core and on the surface of a quantum dot. From the comparison with the experimental data we conclude that the most favorable configuration of the vacancies is an aggregation on a QD surface. We find that Zn vacancies localized in the core or uniformly distributed on the QD surface, do not explain the experimentally observed shift in the absorption curves.