Abstract

A high surface area pn-heterojunction between TiO2 and an organic p-type charge transport material (spiro-OMeTAD) was sensitized to visible light using lead sulfide (PbS) quantum dots. PbS quantum dots were formed in situ on a nanocrystalline TiO2 electrode using chemical bath deposition techniques.1 The organic hole conductor was applied from solution to form the sensitized heterojunction. The structure of the quantum dots was analyzed using HRTEM technique. Ultrafast laser photolysis experiments suggested the initial charge separation to proceed in the subpicosecond time range. Transient absorption laser spectroscopy revealed that interfacial charge recombination of the initially formed charge carriers is much faster than in comparable dye-sensitized systems.2,3 The sensitized heterojunction showed incident photon-to-electron conversion efficiencies (IPCE) of up to 45% and energy conversion efficiencies under simulated sunlight AM1.5 (10 mW/cm2) of 0.49%.

Keywords

Quantum dotLead sulfideChemical bath depositionHeterojunctionUltrafast laser spectroscopyMaterials scienceOptoelectronicsNanocrystalline materialAbsorption (acoustics)Cadmium sulfideCharge carrierChemistryLaserPhotochemistryNanotechnologyOptics

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Publication Info

Year
2002
Type
article
Volume
106
Issue
31
Pages
7578-7580
Citations
745
Access
Closed

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Cite This

Robert Plass, Serge Pelet, Jessica Krueger et al. (2002). Quantum Dot Sensitization of Organic−Inorganic Hybrid Solar Cells. The Journal of Physical Chemistry B , 106 (31) , 7578-7580. https://doi.org/10.1021/jp020453l

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DOI
10.1021/jp020453l