Abstract
PbS (lead sulfide) colloidal quantum dots consist of crystallites with diameters in the nanometer range with organic molecules on their surfaces, partly with additional metal complexes as ligands. These surface molecules are responsible for solubility and prevent aggregation, but the interface between semiconductor quantum dots and ligands also influences the electronic structure. PbS quantum dots are especially interesting for optoelectronic applications and spectroscopic techniques, including photoluminescence, photodiodes and solar cells. Here we concentrate on the latter, giving an overview of the optical properties of solar cells prepared with PbS colloidal quantum dots, produced by different methods and combined with diverse other materials, to reach high efficiencies and fill factors.
Highlights
Material properties are defined by the atomic or molecular composition of a material tested at the macro scale
An interesting method to combine the bottom-up assembly of devices from nanoparticles with the mechanical flexibility of the device is accessible, with the use of relatively simple chemical procedures based on colloidal semiconductor quantum dots [10]
The core of colloidal semiconductor quantum dots often consists of nanocrystals from some hundred to a thousand atoms of II-VI, III-V or IV-VI semiconductors [11]
Summary
Material properties are defined by the atomic or molecular composition of a material tested at the macro scale. Like in DSSCs, the excited electron of the quantum dot is inserted into the TiO2 layer, quantum dots can be applied as sensitizers in solar cells, similar to the dye molecules in leading to the oxidation of the quantum dot, and regeneration into the ground state is obtained by is used soLike that in thesome bandother gap promising can be tailored by geometrical theHere, use ofthe an aforementioned electron from theadvantage redox mediator [53]. 900 nm and and are states ideally suited for light harvesting in the near-infrared lowerbetween than expected, e.g.,2000 duenm, to surface of a different nature or back electron transfer [54] This is why we give here an overview on the most recent results of quantum dot-based solar cells, concentrating on colloidal PbS quantum dots, which can be tailored to start light absorption between. It shouldItbe mentioned that sometimes the boundaries between different of solar cell of aresolar blurred, arewhich blurred, in the which casesare thesorted studies arethe sorted intowhere the sections in cases studies into sections they fitwhere best. they fit best
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