A comparison of different methods to determine diffusion length in dye-sensitized solar cells

Wang, Hongxia & Peter, Laurence (2009) A comparison of different methods to determine diffusion length in dye-sensitized solar cells. Journal of Physical Chemistry C, 113(42), pp. 18125-18133.

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A new steady state method for determination of the electron diffusion length in dye-sensitized solar cells (DSCs) is described and illustrated with data obtained using cells containing three different types of electrolyte. The method is based on using near-IR absorbance methods to establish pairs of illumination intensity for which the total number of trapped electrons is the same at open circuit (where all electrons are lost by interfacial electron transfer) as at short circuit (where the majority of electrons are collected at the contact). Electron diffusion length values obtained by this method are compared with values derived by intensity modulated methods and by impedance measurements under illumination. The results indicate that the values of electron diffusion length derived from the steady state measurements are consistently lower than the values obtained by the non steady-state methods. For all three electrolytes used in the study, the electron diffusion length was sufficiently high to guarantee electron collection efficiencies greater than 90%. Measurement of the trap distributions by near-IR absorption confirmed earlier observations of much higher electron trap densities for electrolytes containing Li+ ions. It is suggested that the electron trap distributions may not be intrinsic properties of the TiO2 nanoparticles, but may be associated with electron-ion interactions.

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80 citations in Web of Science®
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ID Code: 31561
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Electron Transport, IMVS/IMPS, Impedance, Dye-sensitized Solar Cells
DOI: 10.1021/jp906629t
ISSN: 1932-7455
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Transport Properties and Non-Equilibrium Processes (030607)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2009 American Chemical Society
Deposited On: 21 Apr 2010 22:34
Last Modified: 29 Feb 2012 14:10

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