Determination of Electron Diffusion Coefficient and Lifetime in Dye-Sensitized Solar Cells by Electrochemical Impedance Spectroscopy at High Fermi Level Conditions

2008 ◽  
Vol 112 (48) ◽  
pp. 18730-18733 ◽  
Author(s):  
Chuan He ◽  
Linan Zhao ◽  
Zhi Zheng ◽  
Fang Lu
Keyword(s):  
Diffusion Coefficient ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Fermi Level ◽  
Electrochemical Impedance ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Electron Diffusion Coefficient ◽  
Sensitized Solar Cells

Analysis of Charge Transport and Recombination Studied by Electrochemical Impedance Spectroscopy for Dye-sensitized Solar Cells With Atomic Layer Deposited Metal Oxide Treatment on TiO2 Surface

2010 ◽  
Vol 1270 ◽  
Author(s):  
Braden Bills ◽  
Mariyappan Shanmugam ◽  
Mahdi Farrokh Baroughi ◽  
David Galipeau
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Atomic Layer ◽  
Back Reaction ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

AbstractThe performance of dye-sensitized solar cells (DSSCs) is limited by the back-reaction of photogenerated electrons from the porous titanium oxide (TiO2) nanoparticles back into the electrolyte solution, which occurs almost exclusively through the interface. This and the fact that DSSCs have a very large interfacial area makes their performance greatly dependant on the density and activity of TiO2 surface states. Thus, effectively engineering the TiO2/dye/electrolyte interface to reduce carrier losses is critically important for improving the photovoltaic performance of the solar cell. Atomic layer deposition (ALD), which uses high purity gas precursors that can rapidly diffuse through the porous network, was used to grow a conformal and controllable aluminum oxide (Al2O3) and hafnium oxide (HfO2) ultra thin layer on the TiO2 surface. The effects of this interfacial treatment on the DSSC performance was studied with dark and illuminated current-voltage and electrochemical impedance spectroscopy (EIS) measurements.

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