Calculation of activation energies for transport and recombination in mesoporous TiO2/dye/electrolyte films--taking into account surface charge shifts with temperature

The Journal of Physical Chemistry. B
Brian C O'Regan, James R Durrant

Abstract

Transient photovoltage and photocurrent measurements have been employed to determine the recombination and transport kinetics in operating dye-sensitized photovoltaic cells as a function of potential and temperature. Photocurrent transients have been taken at the open circuit potential, as opposed to the standard measurement at short circuit. Kinetic results have been used to calculate the activation energy as function of the Fermi level position in the TiO(2). In the calculation of activation energies, we have explicitly taken into account the temperature dependence of the offset between the electrolyte redox potential and the conduction band edge. This new method gives activation energies that decrease linearly as the Fermi level position moves toward the conduction band edge, as expected, but not found in previous studies. The results are consistent with the presence of a distribution of traps below the TiO(2) conduction band, the detrapping from which limits both the transport and the recombination of electrons.

References

Oct 14, 1996·Physical Review Letters· de Jongh PE, D Vanmaekelbergh
Jul 21, 2006·The Journal of Physical Chemistry. B·Gerrit Boschloo, Anders Hagfeldt

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Citations

Feb 11, 2016·ACS Applied Materials & Interfaces·Kai LvZhong-Sheng Wang
Aug 11, 2015·Physical Chemistry Chemical Physics : PCCP·J MaçairaA Mendes
Dec 22, 2010·Physical Chemistry Chemical Physics : PCCP·Piers R F BarnesBrian C O'Regan
Apr 22, 2011·Advanced Materials·Jonas WeickertLukas Schmidt-Mende
Jan 9, 2013·Physical Chemistry Chemical Physics : PCCP·Sonia R Raga, Francisco Fabregat-Santiago
Feb 3, 2019·The Journal of Chemical Physics·Ludovic Troian-GautierGerald J Meyer
Oct 23, 2009·Accounts of Chemical Research·Gerrit Boschloo, Anders Hagfeldt
Sep 17, 2009·Accounts of Chemical Research·Brian C O'Regan, James R Durrant
Jan 30, 2015·Chemical Reviews·Jihuai WuGenggeng Luo
Oct 6, 2017·ACS Applied Materials & Interfaces·Takurou N MurakamiHiroshi Segawa
Dec 1, 2006·The Journal of Physical Chemistry. B·Nelson A GalioteFritz Huguenin
Dec 15, 2006·The Journal of Physical Chemistry. B·Kai ZhuArthur J Frank

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