Panchromatic sensitized solar cells based on metal sulfide quantum dots grown directly on nanostructured TiO2 electrodes

Upprättat; 2011; 20141117 (albvom)
The use of narrow band gap semiconductors such as PbS may expand the light absorption range to the near-infrared region in quantum-dot-sensitized solar cells (QDSCs), increasing the generated photocurrent. However, the application of PbS as a sensitizer in QDSCs causes some problems of stability and high recombination. Here, we show that the direct growth of a CdS coating layer on previously deposited PbS by the simple method of successive ionic layer adsorption and reaction (SILAR) minimizes these problems. A remarkable short-circuit current density for PbS/CdS QDSCs is demonstrated, ∼11 mA/cm2, compared to that of PbS QDSCs, with photocurrents lower than 4 mA/cm2, using polysulfide electrolyte in both cells. The cell efficiency reached a promising 2.21% under 1 sun of simulated irradiation (AM1.5G, 100 mW/cm2). Enhancement of the solar cell performance beyond the arithmetic addition of the efficiencies of the single constituents (PbS and CdS) is demonstrated for the nanocomposite PbS/CdS configuration. PbS dramatically increases the obtained photocurrents, and the CdS coating stabilizes the solar cell behavior. © 2011 American Chemical Society.

Giménez, SixtoPhotovoltaic and Optoelectronic Devices Group (författare)
Concina, IsabellaDepartment of Physics and Chemistry, INFM — University of Brescia(Swepub:ltu)isacon (författare)
Vomiero, AlbertoDepartment of Physics and Chemistry for Materials and Engineering and CNR-IDASC SENSOR Lab, Brescia University(Swepub:ltu)albvom (författare)
Mora-Seró, IvánPhotovoltaic and Optoelectronic Devices Group (författare)
Photovoltaic and Optoelectronic Devices GroupDepartment of Physics and Chemistry, INFM — University of Brescia (creator_code:org_t)

Ingår i:Journal of Physical Chemistry Letters: American Chemical Society (ACS)2:5, s. 454-4601948-7185

Av författaren/redakt...: Braga, Antonio; Giménez, Sixto; Concina, Isabell ...; Vomiero, Alberto; Mora-Seró, Iván

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