Work

Quantum Dot Sensitization of Organic−Inorganic Hybrid Solar Cells

Year: 2002

Type: article

Abstract: A high surface area pn-heterojunction between TiO 2 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 TiO 2 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%.

Source: The Journal of Physical Chemistry B

DOI: 10.1021/jp020453l

Authors: Robert Plass, Serge Pelet, Jessica Krueger, Michael Grätzel, Udo Bach

Institution: École Polytechnique Fédérale de Lausanne

Language: English

Topic: TiO2 Photocatalysis and Solar Cells

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funders: École Polytechnique Fédérale de Lausanne, Center for Innovative Medicine