Ultrafast Charge Transfer and Upconversion in Zinc β-Tetraaminophthalocyanine-Functionalized PbS Nanostructures Probed by Transient Absorption Spectroscopy

Jannika Lauth*, Gianluca Grimaldi, Sachin Kinge, Arjan J. Houtepen, Laurens D.A. Siebbeles, Marcus Scheele

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

We functionalize PbS nanocrystals with the organic semiconductor Zn β-tetraaminophthalocyanine to design a nanostructured solid-state material with frequent organic–inorganic interfaces. By transient absorption and fluorescence spectroscopy, we investigate the optoelectronic response of this hybrid material under near-infrared excitation to find efficient charge transfer from the nanocrystals to the molecules. We demonstrate that the material undergoes cooperative sensitization of two nanocrystals followed by photon upconversion and singlet emission of the organic semiconductor. The upconversion efficiency resembles that of comparable systems in solution, which we attribute to the large amount of interfaces present in this solid-state film. We anticipate that this synthetic strategy has great prospects for increasing the open-circuit voltage in PbS nanocrystal-based solar cells.

Original languageEnglish
Pages (from-to)14061-14065
Number of pages5
JournalAngewandte Chemie (International Edition)
Volume56
Issue number45
DOIs
Publication statusPublished - 6 Nov 2017

Keywords

  • cooperative sensitization
  • coupled organic–inorganic nanostructures
  • transient absorption
  • upconversion

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