Photoluminescence quenching of a CdS nanoparticles/ZnO nanorods core-shell heterogeneous film and its improved photovoltaic performance

S. A. Vanalakar, S. S. Mali, M. P. Suryawanshi, N. L. Tarwal, P. R. Jadhav, G. L. Agawane, K. V. Gurav, A. S. Kamble, S. W. Shin, A. V. Moholkar, J. Y. Kim, J. H. Kim, P. S. Patil

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

CdS nanoparticles/ZnO nanorods core-shell heterogeneous thin films were successfully fabricated using a chemical bath deposition process. X-ray diffraction (XRD), optical spectroscopy and field emission scanning electron microscopy (FE-SEM) were used for the characterization of the samples. Photoluminescence (PL) properties of the CdS nanoparticles/ZnO nanorods core-shell heterogeneous films were studied using PL spectroscopy. The injection of electrons from the CdS conduction band into the ZnO conduction band upon excitation was confirmed by PL quenching. The PL quenching in the present study demonstrated that more than one CdS nanoparticle is capable of networking with the single ZnO nanorod and taking an active part in the charge injection process. By attaching the CdS nanoparticles, the authors found the surface photovoltaic characteristics of ZnO were changed significantly. With a liquid electrolyte as the hole transport medium, CdS nanoparticles/ZnO nanorods core-shell heterogeneous film exhibited a short-circuit current density of 3.62 mA cm-2 and an open-circuit voltage of 643 mV with a total light-to-electricity power conversion efficiency of 1.48% under visible light.

Original languageEnglish (US)
Pages (from-to)766-772
Number of pages7
JournalOptical Materials
Volume37
Issue numberC
DOIs
StatePublished - Jan 1 2014

Keywords

  • CdS nanoparticle
  • Core-shell heterogeneous film
  • Photoluminescence
  • Photovoltaic characterization
  • ZnO nanorods

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