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Presentació esmolna10

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Presentació esmolna10

  1. 1. Impedance Characterization for Dye-Sensitized Solar Cells<br />Sonia Ruiz Raga<br />Photovoltaic and Optoelectronic Devices Group<br />Universitat Jaume I – Castelló – Spain <br />http://www.elp.uji.es/<br />
  2. 2. Introduction:<br />Emergent DSC technology…<br />… but first we have to go to the lab…<br />
  3. 3. Introduction:<br /> Preparation of a standard Grätzel cell(1)<br /> Charachterization and modelling(2)<br />(1) Wang, Q.; Ito, S.; Grätzel, M.; Fabregat-Santiago, F.; Mora-Sero´,I.; Bisquert, J.; Bossho, T.; Imai, H. J. Phys. Chem. B 2006, 110, 25210.<br />(2) Chapter “Impedance spectroscopy: A general introduction and application to dye-sensitized solar cells”<br />By J. Bisquert i F. Fabregat-Santiago in “Dye sensitized solar cells”<br />Edited by K. Kalyanasudaram, EPFL press, Laussane, Switzerland (2010) <br />ISBN: 978-2-940222-36-0 <br />Distribution: CRC Press, Boca Raton, FL, USA (2010) ISBN:  948-1-4398-0866-5<br />
  4. 4. Preparation of a Grätzel cell:<br />Ingredients:<br />Ruthenium-based Dye<br />FTO glass<br />Surlyn (thermoplastic polymer)<br />Ti-isopropoxidesolution<br />Chloroplatinic acid<br />Nanoparticle TiO2 paste<br />I- / I 3- electrolyte<br />
  5. 5. Preparation of a Grätzel cell:<br />1- Clean the TCO glass<br />3- Deposite the working electrode <br />of nanoporous TiO2 paste<br />450º<br />2- Deposite a compact layer <br />of TiO2 by spray pirolisis<br />TiO2-isopropoxide solution<br />
  6. 6. Preparation of a Grätzel cell:<br />4- Calcinate at 450º during 30 min<br />5- Dip in dye solution overnight<br />6- Prepare the Pt counter - electrode<br />Chloroplatinic acid<br />450ºC<br />
  7. 7. Preparation of a Grätzel cell:<br />7- Seal the device<br />8- Fill with electrolyte<br />Surlyn <br />(thermoplastic <br />polymer)<br />9- Weld Sn contacts<br />
  8. 8. Device completed!<br />Nanoporous TiO2 layer<br />Glass substrat<br />Adsorbed DYE<br />FTO layer<br />I- / I3- electrolyte<br />Compact TiO2 layer<br />Pt counter electrode<br />
  9. 9. Characterization and modelling:<br />
  10. 10. J – V curve:<br />The generation gives the photocurrent<br />Open-circuit voltage is determined by energetic of the materials and recombination<br />The fill factor gives the reduction of the power with respect to:<br />
  11. 11. Impedance Spectroscopy:<br />Solution<br />Solid<br />High frequency<br />Low frequency<br />
  12. 12. Impedance Spectroscopy:<br />
  13. 13. Impedance Spectroscopy:<br />Rs<br />Rco<br />Rct<br />Rt<br />RPt<br />Cco<br />Cµ<br />Zd<br />Rbl<br />CPt<br />Cbl<br />
  14. 14. Characterization and modelling:<br />Rs<br />Rco<br />Rct<br />Rt<br />RPt<br />Cco<br />Cµ<br />Zd<br />Rbl<br />CPt<br />Cbl<br />
  15. 15. Characterization and modelling:<br />Low potentials<br />[0 – 0.300] V<br /><ul><li>Series resistance
  16. 16. Counter electrode resistance & capacitance
  17. 17. Blocking layer resistance & capacitance </li></li></ul><li>Characterization and modelling:<br />Medium potentials<br />[0.300 – 0.600] V<br /><ul><li>Series resistance
  18. 18. Counter electrode resistance & capacitance
  19. 19. Transmission line:</li></ul> - Transport resistance in TiO2<br />- Recombination resistance & capacitance of TiO2<br /><ul><li>Electrolyte diffusion resistance (not always) </li></ul>?<br />
  20. 20. Characterization and modelling:<br />High potentials<br />[0.600 – 0.900] V<br /><ul><li>Series resistance
  21. 21. Counter electrode resistance & capacitance
  22. 22. Recombination resistance & capacitance of TiO2
  23. 23. Electrolyte diffusion resistance</li></li></ul><li>Results:<br />
  24. 24. Future projects:<br />Solid state solar cells<br />Bulk heterojunction solar cells<br />Other semiconductor electrodes<br />Etc…<br />
  25. 25. Acknowledgements:<br />Chapter “Impedance spectroscopy: A general introduction and application to dye-sensitized solar cells”<br />By J. Bisquert i F. Fabregat-Santiago in “Dye sensitized solar cells”<br />Edited by K. Kalyanasudaram, EPFL press, Laussane, Switzerland (2010) <br />ISBN: 978-2-940222-36-0 <br />Distribution: CRC Press, Boca Raton, FL, USA (2010) ISBN:  948-1-4398-0866-5<br />

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