Colloidal atomic layer deposition growth of PbS/CdS core/shell quantum dots

Nasilowski, Michel; Nienhaus, Lea; Bertram, S.; Bawendi, Moungi G.

doi:10.1039/c6cc07403k

Cited by 32 publications

(39 citation statements)

References 20 publications

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“…This suggests that the fluorescence quenching is mainly induced by the incorporated defects at the PbS/CdS interface during the c-ALD process. Bawendi et al 95 reported similar results with c-ALD growth of CdS shells on PbS QDs. Interestingly, they found the QY of PbS/CdS QDs can be retained by the addition of excessive Cd(OA) 2 at the end of the growth.…”

Section: Synthesis and Properties Of Pbs-based Qdsmentioning

confidence: 52%

Recent advances of near infrared inorganic fluorescent probes for biomedical applications

et al. 2020

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Section: Synthesis and Properties Of Pbs-based Qdsmentioning

confidence: 52%

Recent advances of near infrared inorganic fluorescent probes for biomedical applications

et al. 2020

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“…As shown in Fig.6, there are two approaches to form core/shell structure including the cationic exchange and epitaxial shell growth. [102,103] The coated shell may exist in three cases such as uniform shell, composition gradient shell or alloyed shell. Cationic exchange is the most common method to form the shell for PbX QDs because the Pb 2+ cations near the surface are susceptible to be exchanged with other metal ions in the solution such as Cd 2+ cations, which could be proved by the blue-shifted emission of resulted core/shell QDs compared to that of core-only QDs due to the reduced size of PbX QD.…”

Section: Core/shell Structurementioning

confidence: 99%

Near-infrared lead chalcogenide quantum dots: Synthesis and applications in light emitting diodes*

Liu¹,

Zhong²,

Zheng³

et al. 2019

Chinese Phys. B

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This paper reviews recent progress in the synthesis of near-infrared (NIR) lead chalcogenide (PbX; PbX=PbS, PbSe, PbTe) quantum dots (QDs) and their applications in NIR QDs based light emitting diodes (NIR-QLEDs). It summarizes the strategies of how to synthesize high efficiency PbX QDs and how to realize high performance PbX based NIR-QLEDs. Chinese Physics BCompared with the development of visible colloidal QDs, the development process of nearinfrared (NIR) QDs is relatively slow because of the challenges, such as lacking of effective synthesis method and characterization techniques. Due to the above-mentioned advantages, NIR QDs show great potential and promise in many applications. Apart from the applications in optoelectronic devices, NIR QDs are also widely employed in interdisciplinary domains including their acting as optical amplifier medium for electrical communication systems, [12] as remote sensing or as fluorescent materials for biomedical imaging, labeling and sensing. [13][14][15] Among all types of the NIR QDs that had already been found, [6] the lead chalcogenide QDs (PbX; PbX=PbS, PbSe, PbTe) in IV-VI group have shown the great promise both in fundamental scientific research and in technological applications, as they have narrow bulk bandgaps (0.41 eV, 0.278 eV and 0.31 eV at room temperature, respectively) along with broadband absorption, large excitonic Bohr radii (due to the high dielectric constant and small effective mass of carriers) and multiple exciton generation. [16] Furthermore, their energy bandgap can be widely tuned from about 0.3 eV to >2.0 eV. [12][13][14][15][17][18][19][20] These remarkable and unique properties make the PbX QDs ideal candidates in NIR optoelectronic applications.

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“…Colloidal atomic layer deposition is a self-limiting layer by layer growth method that has been developed to deposit CdS layers on PbS QDs to produce high-quality PbS/ CdS core-shell QDs. 75 This method allows for fine control of the CdS thickness, down to the monolayer, combined with room temperature conditions. 75 This method could in principle be extended to the synthesis of other QDs system, such as PbSe/CdSe, PbS/CdS/ZnS, HgSe/CdS, etc.…”

Section: Synthesis Of Core-shell Qdsmentioning

confidence: 99%

“…75 This method allows for fine control of the CdS thickness, down to the monolayer, combined with room temperature conditions. 75 This method could in principle be extended to the synthesis of other QDs system, such as PbSe/CdSe, PbS/CdS/ZnS, HgSe/CdS, etc. 75…”

Section: Synthesis Of Core-shell Qdsmentioning

confidence: 99%

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Colloidal Quantum Dots for Solar Technologies

Zhao

Rosei

2017

Chem

122

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Colloidal quantum dots (QDs) have been widely studied as absorbers for various solar technologies because of their excellent optoelectronic properties, such as a size-dependent absorption spectrum, efficient charge separation and transport, and good photostability. During the last decade, major research initiatives have been pursued to elucidate the structure-dominated optoelectronic properties with the goal of maximizing overall solar-device power-conversion efficiency. In this review, we discuss the chemical synthesis methods and the properties of these QDs and emphasize their applications in solar cells, solardriven hydrogen production, and luminescent solar concentrator devices. We describe recent research advances in this rapidly growing field by highlighting various strategies developed for the synthesis of QDs with different structure and composition. We also describe available approaches for tuning charge dynamics in QDs and metal oxides. Finally, we introduce several types of solar devices based on QDs and discuss their fabrication and performance. We also discuss challenges to be addressed for the controlled synthesis of QDs.

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Colloidal atomic layer deposition growth of PbS/CdS core/shell quantum dots

Cited by 32 publications

References 20 publications

Recent advances of near infrared inorganic fluorescent probes for biomedical applications

Recent advances of near infrared inorganic fluorescent probes for biomedical applications

Near-infrared lead chalcogenide quantum dots: Synthesis and applications in light emitting diodes*

Colloidal Quantum Dots for Solar Technologies

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