Photophysics and charge dynamics of Q-PbS based mixed ZnS/PbS and PbS/ZnS semiconductor nanoparticles

Kumar, Anil; Jakhmola, Anshuman

doi:10.1016/j.jcis.2005.11.028

Cited by 15 publications

(10 citation statements)

References 43 publications

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“…This effect is important because it is an indirect measurement of the improvement of the charge transfer and the exciton life-time for the PbS/Cu 2 S/ZnS material. 24,31,32 The blue shift observed after the growth of a ZnS layer has been previously observed in other PbS core/shell systems. For example, the addition of a ZnS shell induces the absorption coefficient of PbS/ZnS nanoparticles to decrease in wavelength to the range of 350-500 nm from the absorption wavelength value of pure PbS nanoparticles of 600 nm, which results in a blue shift of the absorption signal.…”

Section: Resultssupporting

confidence: 75%

Synthesis of PbS/Cu2S/ZnS nanoparticles and their optical properties

Serrano¹,

Gómez²

2015

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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The use of simple stabilizers, such as trisodium citrate and 3-mercaptopropionic acid, with the colloidal solution-phase growth method is successful in synthesizing PbS/Cu2S core/shell nanoparticles with emission in the visible range and with improved luminescence properties. The core/shell arrangement for particles with different crystalline structures is achieved, and, in addition, the first reported synthesis of the PbS/Cu2S/ZnS core/shell/shell system. The absorption and photoluminescence spectra and scanning electron microscopy images provide direct proof of the formation of PbS/Cu2S cores with sizes around 20 nm and a ZnS secondary shell 8 nm thick. According to the ultraviolet–visible absorption and photoluminescence spectra, the optical characteristics observed in the synthesized material correspond to a PbS/Cu2S/ZnS system with higher confinement than the PbS/Cu2S nanoparticles. The quantum yield improves by 14% from the PbS/Cu2S to the PbS/Cu2S/ZnS nanoparticles.

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Section: Resultssupporting

confidence: 75%

Synthesis of PbS/Cu2S/ZnS nanoparticles and their optical properties

Serrano¹,

Gómez²

2015

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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“…The enhancement in the emission is due to the fact that high band gap ZnS shell material suppresses the tunneling of the charge carriers from the MnS core to the surface atoms of the shell, resulting in more photogenerated electrons and holes confined inside the MnS cores. Consequently, passivated nonradiative recombination sites that exist on the core surfaces lead to high PL efficiency [16,20]. The emission of peak around ≈360nm can be ascribed to the hole traps originating from the unsaturated 3 sp orbital of the surface S atoms.…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

“…The luminescent properties of ZnS are enhanced. The electronic and emission behavior of the composite PbS/ZnS particles is very different compared to either pure ZnS and PbS nanoparticles or their additive behavior: the optical, photophysical, and electronic properties of these nanoparticles can be manipulated by changing the surface environment, which may have important implications in the areas of photonics and photophysics [16]. Recent advances in the design and control of heterostructures and superlattices in 1D nanoscale semiconductors have opened the door to new device concepts.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the shell on the optical properties of lead sulfide is most likely associated with the surface modification of the PbS nanoparticles. Anil Kumar et al [16] reported that the surface of ZnS and PbS has been modified by interfacing PbS on ZnS and ZnS on PbS nanoparticles. This produced core-shell nanocomposites ZnS/PbS and PbS/ZnS with tunable electronic properties.…”

Section: Introductionmentioning

confidence: 99%

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Improved Optical Properties of Sulphide based Core/Shell Nanostructures

Dharshini¹,

Shally²,

Jayam³

et al. 2014

IOSRJAP

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“…Among these p-conjugated polymers, polypyrrole (PPy) is one of the most investigated polymers due to its high electrical conductivity and ease of preparation. [48][49][50][51] Experimental section The electronic properties will be obviously increased with an increase in the area of the heterojunction.…”

Section: Introductionmentioning

confidence: 99%

Growth of axial nested P–N heterojunction nanowires for high performance diodes

Chen

Xue

Yang

et al. 2015

Phys. Chem. Chem. Phys.

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Heterojunction nanomaterials have attracted the interest of numerous scientists and engineers to explore the fundamental scientific understanding of the formation of heterojunction nanostructures, their special properties with enhanced electrical and optical performance and the relationship between the functionality and the molecular structures. In this work, we synthesized novel axial nested P-N heterojunction nanowires combining the inorganic semiconductor PbS and the organic conjugated polymer polypyrrole (PPy). The nested P-N heterojunction nanowires (NWs) show a higher rectification ratio (exceeding 100), long-term stability and high unilateral conductivity due to the bigger area of junction produced.

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Photophysics and charge dynamics of Q-PbS based mixed ZnS/PbS and PbS/ZnS semiconductor nanoparticles

Cited by 15 publications

References 43 publications

Synthesis of PbS/Cu2S/ZnS nanoparticles and their optical properties

Synthesis of PbS/Cu2S/ZnS nanoparticles and their optical properties

Improved Optical Properties of Sulphide based Core/Shell Nanostructures

Growth of axial nested P–N heterojunction nanowires for high performance diodes

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