ELECTRODEPOSITION OF CADMIUM TELLURIDE ON CONDUCTIVE GLASS FOR PHOTOVOLTAIC APPLICATIONS

• DOI: ATENA

• Palavras-chave: ATENA

• Keywords: cadmium telluride, electrodeposition, cyclic voltammetry, photovoltaic solar cell.

• Abstract:

  Cadmium Telluride (CdTe) films

  were deposited on transparent conductor fluorine

  oxide doped tin oxide (FTO) by electrodeposition

  in aqueous sulfuric acid solution (H2

  SO4

  ),

  with cadmium sulfate (CdSO4

  . 8/3 H2

  O) and

  tellurium dioxide (TeO2

  ). The electrodeposition

  mechanism was previously investigated by cyclic

  voltammetry. The voltammograms detected

  CdTe electrodeposition at negative potentials,

  with cathodic peaks at potentials between -0.7

  and -0.3 V and anodic peaks about + 0.75 V.

  The electrodeposition was made by pulse

  voltammetry, with current periodic reversion.

  The films conductivity was verified by the MottSchottky, method, whose qualitative analyzes

  revealed a p-type CdTe. The morphology, the

  chemical composition and the films structure

  were analyzed by scanning electron microscopy

  (SEM), energy dispersive spectroscopy (EDS)

  and X-ray diffraction (XRD). The films presented

  composition with tellurium excess, confirming

  the verified conductivity, and predominant cubic

  structure. From the obtained films, were built

  1cm2 solar cells, utilizing the n-type CdS as a

  cell optical window, and lithium perchlorate

  (LiClO4

  ) and polyaniline based electrodes. The

  cell electrical parameters were determined by

  the construction of current-tension curves. The

  cell presented short circuit current of 0.134 mA,

  open circuit voltage of 400 mV and maximum

  power of 0.0216 mW. 

• Número de páginas: 15