3 years ago

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

Ultrafast Charge Transfer and Upconversion in Zinc β-Tetraaminophthalocyanine-Functionalized PbS Nanostructures Probed by Transient Absorption Spectroscopy
Marcus Scheele, Jannika Lauth, Laurens D. A. Siebbeles, Arjan J. Houtepen, Sachin Kinge, Gianluca Grimaldi
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. PbS nanocrystals and the organic semiconductor Zn β-tetraaminophthalocyanine are assembled into a hybrid thin film. Under near-infrared excitation, this solid state material shows efficient charge transfer from the nanocrystals to the molecules, followed by ultrafast optical upconversion, thus offering great prospects for increasing the open-circuit voltage in PbS nanocrystal-based solar cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707443

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