Loading...

Selection of a Nanostructured Pattern for Increasing Absorption Efficiency of a Solar cell Based Based on TiO2

Daneshvare Asl, Shervin | 2013

625 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44972 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhad, Khatiboleslam; Mohammadi, Mohammad Reza
  7. Abstract:
  8. Dye–sensitized solar cell (DSSC) includes (a) A transparent conductive oxide coated glass substrate, (b) Semi conductive film, (c) Dye adsorbed on this film, (d) Redox couple electrolyte and (e) A counter electrode which can reduce redox couple.In this study, selection of a nanostructured pattern for increasing absorption efficiency of a DSSC based on TiO2 has been considered. For this purpose, using carbon nanotubes (CNTs) in fabrication of photoelectrode has been proposed. Therefore, at the first TiO2–CNT nanocomposites contained various percent of carbon nanotube was coated on fluorinated tin oxide (FTO) conductive glasses via sol–gel dip coating method. Then DSSCs were assembled by prepared anodes from this photoelectrodes, iodide/ triiodide redox couple electrolyte and platinum coated FTO substrates as cathodes.Determination of thickness, X–ray diffraction (XRD), field emission scanning electron microscopy (FE–SEM), ultraviolet–visible transmittance spectroscopy (UV–vis) and photoluminescence spectroscopy (Pl) used to composite films characterization. For evaluation of photovoltaic performance and internal resistances of assembled solar cells, current density–voltage measurements (J–V Curves) and electrochemical impedance spectroscopy (EIS) has been used, respectively.Solar cell fabricated from TiO2–3%Wt.CNT nanocomposite demonstrates maximum conversion efficiency (5.31%) and compared with a conventional TiO2 cell, this cell shows 69% increase in solar to electric energy conversion efficiency. The enhancement of efficiency is attributed to increasing electrical conductivity, reducing recombination of charge carriers and decreasing the charge transport resistance at the TiO2/dye/electrolyte interface. In fact, the CNTs functioned as bridges between the TiO2 nanoparticles and FTO substrate
  9. Keywords:
  10. Carbon Nanotubes ; Dye Sensitized Solar Cells ; Titanium Dioxide ; Sol-Gel Method ; Conversion Efficiency ; Dip Coating

 Digital Object List

 Bookmark

...see more