Modification of TiO2 heterojunctions with benzoic acid derivatives in hybrid molecular solid-state devices

Jessica Krüger, Udo Bach, Michael Grätzel

Research output: Contribution to journalArticleResearchpeer-review

209 Citations (Scopus)


The organic-inorganic heterojunction of TiO2 with the new hole conducting material modified via surface adsorption of para-substituted benzoic acids with different dipole moments was studied. Organic molecules such as para-functionalized benzoic acids can be used to systematically modify current-voltage characteristics of organic-inorganic heterojunctions. These results were shown to be consistent with the variation in the work-function of the modified TiO2, measured on the free surface. This effect is attributed to a change in the band bending at the TiO2 spiro-(2,2′7,7′-tetrakis-(N,N-di-p-methoxyphenylamine) -9,9′spirobifluorene) interface induced by the dipole moment of the adsorbed benzoic acids.

Original languageEnglish
Pages (from-to)447-451
Number of pages5
JournalAdvanced Materials
Issue number6
Publication statusPublished - 1 Jan 2000
Externally publishedYes

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