Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

Dogan, Sedat; Bielewicz, Thomas; Lebedeva, Vera; Klinke, Christian

doi:10.1039/c4nr06957a

Cited by 41 publications

(52 citation statements)

References 51 publications

(63 reference statements)

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“…Ultrathin PbS sheets with lateral‐size about hundreds of nanometres have been firstly synthesized through two‐dimensional oriented attachment of quantum dots followed by surface reconstruction . It inspires follow‐up research . Aerts and coworkers reported highly efficient carrier multiplication in PbS nanosheets .…”

Section: Introductionmentioning

confidence: 99%

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A robust method for the synthesis of colloidal PbS nanosheets

Premathilaka

Jiang

Antu

et al. 2016

Physica Rapid Research Ltrs

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In the synthesis of colloidal PbS nanosheets, acetic acid – either injected externally or produced during the reaction – has a significant effect on the growth of the nanosheets. When the acetic acid to lead molar ratio is above 1:8, no nanosheets are observed in the product. By replacing lead acetate with lead oxide to prepare the lead precursor for the reaction, the effect of acetic acid is avoided, resulting in a robust synthesis with nearly 100% success rate. In the new synthesis, the purity of trioctylphosphine (the co‐solvent for sulfur precursor) has no significant effect on the formation of nanosheets. Thickness tunability is achieved in the acetate‐free synthesis by tuning the reaction temperature. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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Section: Introductionmentioning

confidence: 99%

“…Bhandari and coworkers demonstrated thickness‐dependent energy gaps of the PbS nanosheets . Dogan and coworkers report large carrier mobility in single PbS nanosheets , making it promising for photovoltaic applications. However, synthesis of colloidal PbS nanosheets is still at its early stage.…”

Section: Introductionmentioning

confidence: 99%

A robust method for the synthesis of colloidal PbS nanosheets

Premathilaka

Jiang

Antu

et al. 2016

Physica Rapid Research Ltrs

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“…The height of the nanosheets directly determines the band gap of the material by confinement23. This tunability is of advantage for the performance of applications such as transistors, photodetectors and solar cells17182023. The synthesis of the nanosheets is independent of the fabrication of the devices, which makes it practical for industrial applications.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we demonstrate the presence of easily accessible SOC in nanomaterials synthesized by colloidal chemistry. The solution-based synthesis of colloidal nanomaterials offers enormous opportunities in the production of inexpensive and high-quality crystals for electronic and, as we will show, spintronic devices171819. Colloidal lead sulphide (PbS) nanosheets as continuous 2D crystals with promising properties do not suffer from tunnel barriers like other colloidal systems, such as thin films of nanoparticles171820.…”

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confidence: 99%

Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets

et al. 2017

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Employing the spin degree of freedom of charge carriers offers the possibility to extend the functionality of conventional electronic devices, while colloidal chemistry can be used to synthesize inexpensive and tunable nanomaterials. Here, in order to benefit from both concepts, we investigate Rashba spin–orbit interaction in colloidal lead sulphide nanosheets by electrical measurements on the circular photo-galvanic effect. Lead sulphide nanosheets possess rock salt crystal structure, which is centrosymmetric. The symmetry can be broken by quantum confinement, asymmetric vertical interfaces and a gate electric field leading to Rashba-type band splitting in momentum space at the M points, which results in an unconventional selection mechanism for the excitation of the carriers. The effect, which is supported by simulations of the band structure using density functional theory, can be tuned by the gate electric field and by the thickness of the sheets. Spin-related electrical transport phenomena in colloidal materials open a promising pathway towards future inexpensive spintronic devices.

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“…This opens the possibility of charge carrier movement in the plane of the colloids, while still having the possibility to tune the bandgap by the confinement of height. The latter allows an optimization of the properties for relevant applications like solar cells [9]. Recently, Jannika Lauth succeeded in synthesizing InSe nanosheets which are less toxic compared to the workhorse materials CdSe [10].…”

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confidence: 99%

Hierarchical Colloidal Nanostructures – from Fundamentals to Applications

Klinke

2016

Zeitschrift Für Physikalische Chemie

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In order for our society to stay competitive in terms of computing power, sensing, and alternative energy new materials are required. Material science is one of the pillars of innovation in modern culture. In respect of future optical and electrical applications there is a need for active components with higher efficiencies and lower costs. Nanostructured materials such as nanoparticles, nanowires, carbon nanotubes, graphene and nanosheets are considered to be among the most promising candidates for faster and less expensive electronic devices and more efficient solar cells and fuel cells. This is mostly due to their low-dimensional nature which opens new intriguing possibilities for technology. The synthesis of inorganic nanostructures defined by colloidal chemistry has developed strongly and became a versatile tool in various fields of application: Colloidal nanoparticles are used as fluorescence markers in medicine and biology and in the latest generation of TV sets semiconducting nanoparticles are used in the background illumination systems, which demonstrates the bright future of colloidal nanomaterials. Further, colloidal nanostructures of various dimensionality and hierarchy can be used as inexpensive transistors, photo-detectors, chemical sensors, thermoelectric materials and as solar cells. Exciting properties include Coulomb blockade, adjustable electric transport, blinking, and continuously tunable optical properties. In order to produce nanomaterials with new, tailored properties it is indispensable to understand the mechanisms of synthesis, the optical processes and the electrical transport in detail.In this issue of Zeitschrift für Physikalische Chemie a representative crosssection of researchers active in Germany or with close relations report on their interesting, recent results in synthesis, assembly, and characterization. In the first contribution, the group of Victor Puntes demonstrates a simple room-temperature approach for the synthesis of gold nanoparticles and how to gain control over size

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Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

Cited by 41 publications

References 51 publications

A robust method for the synthesis of colloidal PbS nanosheets

A robust method for the synthesis of colloidal PbS nanosheets

Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets

Hierarchical Colloidal Nanostructures – from Fundamentals to Applications

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