Journal article

Tracking the adsorption and electron injection rates of CdSe quantum dots on TiO2: Linked versus direct attachment

Pernik D, Tvrdy K, Radich J, Kamat P ...see all

Journal of Physical Chemistry C, vol. 115, issue 27 (2011) pp. 13511-13519

  • 129


    Mendeley users who have this article in their library.
  • 114


    Citations of this article.
Sign in to save reference


Understanding CdSe quantum dot (QD) adsorption phenomena on mesoscopic TiO2 films is important for improving the performance of quantum dot sensitized solar cells (QDSSCs). A kinetic adsorption model has been developed to elucidate both Langmuir-like sub-monolayer adsorption and QD aggregation processes. Removal of surface-bound trioctylphosphine oxide as well as use of 3-mercaptopropionic acid (MPA) as a mol. linker improved the adsorption of toluene-suspended QDs on TiO2 films. The adsorption const. Kad for sub-monolayer coverage was (6.7 ± 2.7) × 103 M-1 for direct adsorption and (5.9 ± 2.0) × 104 M-1 for MPA-linked assemblies. Prolonged exposure of a TiO2 film to a CdSe QD suspension resulted in the assembly of aggregated particles regardless of the method of adsorption. A greater coverage of TiO2 was achieved with smaller QDs due to reduced size constraints. Ultrafast transient absorption spectroscopy demonstrated faster electron injection into TiO2 from directly adsorbed QDs (kET = 7.2 × 109 s-1) compared to MPA-linked QDs (kET = 2.3 × 109 s-1). The adsorption kinetic details presented in this study are useful for controlling CdSe QD adsorption on TiO2 and designing efficient photoanodes for QDSSCs. [on SciFinder(R)]

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Douglas R. Pernik

  • Kevin Tvrdy

  • James G. Radich

  • Prashant V. Kamat

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free