Characterization of size-quantized PbTe thin films synthesized by an electrochemical co-deposition method

ERDOGAN I. Y., Oznuluer T., Bulbul F., Demir U.

THIN SOLID FILMS, cilt.517, sa.18, ss.5419-5424, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 517 Sayı: 18
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.tsf.2009.01.018
  • Dergi Adı: THIN SOLID FILMS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.5419-5424
  • Anahtar Kelimeler: Underpotential deposition, Quantum-confinement, Electrodeposition, Ethylenediamine tetraacetic acid, Band gap, Au (111), ATOMIC LAYER EPITAXY, THERMOELECTRIC-MATERIALS, LEAD CHALCOGENIDES, QUANTUM DOTS, DEPOSITION, ELECTRODEPOSITION, MONOLAYERS, AU(111), GROWTH, PBS
  • Atatürk Üniversitesi Adresli: Evet

Özet

Size-quantized thin films of PbTe were electrodeposited on Au (1 1 1) substrates using a practical electrochemical method, based on the simultaneous underpotential deposition of Pb and Te from the same solution containing ethylenediamine tetraacetic acid, Pb2+, and TeO32- at a constant potential. These thin films were characterized by X-ray diffraction (XRD), scanning tunneling microscopy (STM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), and reflection absorption-FTIR (RA-FTIR). AFM, STM, and XRD results indicate that the growth of PbTe thin films follows the nucleation and two dimensional growth mechanism, resulting in high crystalline films of PbTe (2 0 0) in cubic structure, which was grown at a kinetically preferred orientation on Au (1 1 1). The EDS analyses of the films reveal that Pb and Te are present in an atomic ratio of approximately 1:1. The quantum-confined effect of the PbTe thin films are confirmed by the RA-FTIR measurements. (C) 2009 Elsevier B.V. All rights reserved.