Charge transport and back reaction in solid-state dye-sensitized solar cells: A study using intensity-modulated photovoltage and photocurrent spectroscopy

J Kruger, R Plass, M Gratzel, P J Cameron, L M Peter

Research output: Contribution to journalArticlepeer-review

330 Citations (Scopus)

Abstract

Solid-state dye-sensitized solar cells employing spiro-MeOTAD [2,2'7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene] as a hole transport phase were studied by intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) over a wide range of illumination intensity. The IMPS and IMVS responses provide information about charge transport and electron-hole recombination, respectively. For the range of light intensities investigated, the dynamic photocurrent response appears to be limited by the transport of electrons in the nanocrystalline TiO2 film rather than by the transport of holes in the spiro-MeOTAD. The diffusion length of electrons in the TiO2 was found to be 4.4 x 10(-4) cm. This value was almost independent of light intensity as a consequence of the fact that the electron diffusion coefficient and the rate constant for electron-hole recombination both increase in the same way with light intensity (proportional to I-0(0.64)).
Original languageEnglish
Pages (from-to)7536-7539
Number of pages4
JournalJournal of Physical Chemistry B
Volume107
Issue number31
DOIs
Publication statusPublished - 2003

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