Journal of Solid State Electrochemistry

, Volume 11, Issue 5, pp 647–653 | Cite as

Properties of the electronic density of states in TiO2 nanoparticles surrounded with aqueous electrolyte

  • Ilana Abayev
  • Arie Zaban
  • Vladimir G. Kytin
  • Alexey A. Danilin
  • Germà Garcia-Belmonte
  • Juan Bisquert
Original Paper

Abstract

Results on the density of sates of nanostructured TiO2 as a function of particle size and temperature are reported. In TiO2 nanoparticles with a mean diameter 10 nm, the density of states (DOS) is strongly temperature-dependent, indicating a rearrangement of the bandgap states in which the exponential energy parameter (width of the distribution) increases from 0.080 to 50 °C. For nanoparticles with mean diameters of 20 and 30 nm the DOS is much closer to an exponential distribution, and is much less sensitive to temperature variations. It is suggested that nanometer confinement has a significant influence on the density of electronic states for 10-nm particles, while band tailing is similar to that occurring in bulk semiconductors for the larger particles.

References

  1. 1.
    Garcia-Belmonte G, Kytin V, Dittrich T, Bisquert J (2003) J Appl Phys 94:5261CrossRefGoogle Scholar
  2. 2.
    Cinnsealach R, Boschloo G, Rao SN, Fitzmaurice D (1999) Sol Energy Mater Sol Cells 57:107CrossRefGoogle Scholar
  3. 3.
    Garcia-Cañadas J, Fabregat-Santiago F, Porqueras I, Person C, Bisquert J, Garcia-Belmonte G (2004) Solid State Ionics 175:521CrossRefGoogle Scholar
  4. 4.
    O’Regan B, Grätzel M (1991) Nature 353:737CrossRefGoogle Scholar
  5. 5.
    Fabregat-Santiago F, Mora-Seró I, Garcia-Belmonte G, Bisquert J (2003) J Phys Chem B 107:758CrossRefGoogle Scholar
  6. 6.
    Fabregat-Santiago F, Bisquert J, Garcia-Belmonte G, Boschloo G, Hagfeldt A (2005) Sol Energy Mater Sol Cells 87:117CrossRefGoogle Scholar
  7. 7.
    Peter LM, Duffy NW, Wang RL, Wijayantha KGU (2002) J Electroanal Chem 127:524–525Google Scholar
  8. 8.
    Boschloo G, Hagfeldt A (2005) J Phys Chem B 109:12093CrossRefGoogle Scholar
  9. 9.
    Palomares E, Clifford JN, Haque SA, Lutz T, Durrant JR (2003) J Am Chem Soc 125:475CrossRefGoogle Scholar
  10. 10.
    Agrell HG, Boschloo G, Hagfeldt A (2004) J Phys Chem B 108:12388CrossRefGoogle Scholar
  11. 11.
    Bisquert J (2003) Phys Chem Chem Phys 5:5360CrossRefGoogle Scholar
  12. 12.
    Nelson J (1999) Phys Rev B 59:15374CrossRefGoogle Scholar
  13. 13.
    van de Lagemaat J, Frank AJ (2000) J Phys Chem B 104:4292CrossRefGoogle Scholar
  14. 14.
    van de Lagemaat J, Frank AJ (2001) J Phys Chem B 105:11194CrossRefGoogle Scholar
  15. 15.
    Bisquert J, Zaban A, Salvador P (2002) J Phys Chem B 106:8774CrossRefGoogle Scholar
  16. 16.
    Bisquert J, Zaban A, Greenshtein M, Mora-Seró I (2004) J Am Chem Soc 126:13550CrossRefGoogle Scholar
  17. 17.
    Movilla JL, Garcia-Belmonte G, Bisquert J, Planelles J (2005) Phys Rev B 72:153313CrossRefGoogle Scholar
  18. 18.
    Kopidakis N, Neale NR, Zhu K, van de Lagemaat J, Frank AJ (2005) Appl Phys Lett 87:202106CrossRefGoogle Scholar
  19. 19.
    Olson CL, Nelson J, Islam MS (2006) J Phys Chem B 110:9995CrossRefGoogle Scholar
  20. 20.
    Kytin VG, Bisquert J, Abayev I, Zaban A (2004) Phys Rev B 70:193304CrossRefGoogle Scholar
  21. 21.
    Wang H, He J, Boschloo G, Lindström H, Hagfeldt A, Lindquist S (2001) J Phys Chem B 105:2529CrossRefGoogle Scholar
  22. 22.
    Redmond G, Fitzmaurice D, Grätzel M (1993) J Phys Chem 97:6951CrossRefGoogle Scholar
  23. 23.
    Boschloo GK, Goossens A (1996) J Phys Chem 100:19489CrossRefGoogle Scholar
  24. 24.
    Cao F, Oskam G, Searson PC, Stipkala JM, Heimer TA, Farzad F, Meyer GJ (1995) J Phys Chem 99:11974CrossRefGoogle Scholar
  25. 25.
    de Jongh PE, Vanmaekelbergh D (1997) J Phys Chem B 101:2716CrossRefGoogle Scholar
  26. 26.
    Pankove JI (1971) Optical Processes in Semiconductors. Prentice-Hall, Englewood Cliffs, NJGoogle Scholar
  27. 27.
    Dittrich T, Mora-Seró I, Garcia-Belmonte G, Bisquert J (2006) Phys Rev B 73:045407CrossRefGoogle Scholar
  28. 28.
    Mora-Seró I, Anta JA, Garcia-Belmonte G, Dittrich T, Bisquert J (2006) J Photochem Photobiol A Chem 182:280CrossRefGoogle Scholar
  29. 29.
    Franceschetti A, Williamson A, Zunger A (2000) J Phys Chem B 104:3398CrossRefGoogle Scholar
  30. 30.
    Franceschetti A, Zunger A (2000) Appl Phys Lett 76:1731CrossRefGoogle Scholar
  31. 31.
    Brus LE (1984) J Chem Phys 80:4403CrossRefGoogle Scholar
  32. 32.
    Parker RA (1964) Phys Rev 124:1719CrossRefGoogle Scholar
  33. 33.
    Arkhipov VI, Adriaenssens GJ (1998) J Non-Cryst Solids 166:227–230Google Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Ilana Abayev
    • 1
  • Arie Zaban
    • 1
  • Vladimir G. Kytin
    • 2
  • Alexey A. Danilin
    • 2
  • Germà Garcia-Belmonte
    • 3
  • Juan Bisquert
    • 3
  1. 1.Department of ChemistryBar-Ilan UniversityRamat-GanIsrael
  2. 2.Department of PhysicsMoscow Lomonosov State UniversityMoscowRussia
  3. 3.Departament de Ciències ExperimentalsUniversitat Jaume ICastellonSpain

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