Scanning Probe Characterization of Heterostructured Colloidal Nanomaterials

Nanayakkara, Sanjini U.; Lagemaat, Jao van de; Luther, Joseph M.

doi:10.1021/cr500280t

Cited by 33 publications

(28 citation statements)

References 250 publications

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“…Alternatively to core/shell nanocrystals, Janus particles (anisotropic particles where each side of the particle is a different material) could retain the same benefits while allowing access to each carrier. Nanayakkara et al have shown a built-in potential difference in these heterostructured nanocrystals with scanning Kelvin probe measurements that can be explained by having a space-charge region where 10-15 charges have transferred across the nanoscale junction [87,88]. Furthermore, Zhang et al [89] report a controllable cation exchange synthesis to produce Janus particles of various PbE and CdE (E = S, Se, Te) compositions that have been applied to this type of study [90].…”

Section: Absorption and Multiple Exciton Generationmentioning

confidence: 99%

Quantum Dot Solar Cells: Small Beginnings Have Large Impacts

2018

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From a niche field over 30 years ago, quantum dots (QDs) have developed into viable materials for many commercial optoelectronic devices. We discuss the advancements in Pb-based QD solar cells (QDSCs) from a viewpoint of the pathways an excited state can take when relaxing back to the ground state. Systematically understanding the fundamental processes occurring in QDs has led to improvements in solar cell efficiency from ~3% to over 13% in 8 years. We compile data from ~200 articles reporting functioning QDSCs to give an overview of the current limitations in the technology. We find that the open circuit voltage limits the device efficiency and propose some strategies for overcoming this limitation.

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Section: Absorption and Multiple Exciton Generationmentioning

confidence: 99%

Quantum Dot Solar Cells: Small Beginnings Have Large Impacts

2018

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“…[64] Development of probe-based imaging techniques further improved the spatial resolution down to a single atom. [65][66][67] The TR studies have been carried out on QDs both to track the growth mechanism and also to investigate the relaxation pathways and lifetime of exciton that play a crucial role in the performance of QD-based devices. [32,68] Combination of TR and SR techniques gave more insight into the fundamental properties of QDs.…”

Section: Sr and Tr Tools For Qd Metrologymentioning

confidence: 99%

“…Scanning tunneling microscopy (STM) offers atomic-scale mapping of electronic states in individual QD. [66] In STM, a sharp metallic tip typically made of platinum-iridium (Pt-Ir) or tungsten is brought into very close proximity (≈3−10 Å) to a conducting or semiconducting surface. The STM measures the tunneling current produced due to the quantum tunneling of electrons between the tip and the surface.…”

Section: Sr Microscopy Combined With Sr Spectroscopymentioning

confidence: 99%

“…[125] Spatial distribution of electron/hole states can be imaged via STS. The spatial mapping of energy levels in InAs/ZnSe core-shell QDs by STS is well described in the previous works, and the corresponding images are given in Figure 9d-h. [66] Surface states in individual QDs can be investigated in real space by combining STM and STS. The surface reconstructions from STS mapping lead to the appearance of ordered atomic planes in crystalline QDs.…”

Section: (10 Of 21)mentioning

confidence: 99%

“…Single-molecule confocal microscope and TRPL [117,118] Atomic-scale mapping of electronic states STM [66] LDOS STS [123] Electronic energy gaps STS [124] Intra-doublet spacing and interdoublet spacing STS [124] Spatial distribution of electron/hole states STS [125] Energy states at core-shell interface STS [125] Work function KPFM [146,147] The charged state of QD EFM [149] In situ monitoring of QD growth TR WAXS/SAXS [68,158]…”

Section: Challenges and Future Developments Of Tr-and Sr-based Qd Metmentioning

confidence: 99%

See 2 more Smart Citations

Quantum Dots Microstructural Metrology: From Time‐Resolved Spectroscopy to Spatially Resolved Electron Microscopy

Hasna

Hou

Welland

2020

Part & Part Syst Charact

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Quantum dots (QDs) have gained broad acceptance, applicability, and much interest in current semiconductor technology due to their unique optical and electrical properties. [1,2] QDs are semiconductors with size between 3 and 20 nm where electron and hole wave functions are highly confined. [3] The dimension should be comparable to the Bohr exciton radius of the material, and that leads to discrete energy levels in QD. QDs are attracted by their unique atomiclike narrow emission that can be tuned easily by controlling their size, structure, and composition. [4-6] The optical and electrical properties of QDs are better than organic fluorophores. For instance, QD has high quantum efficiency, excellent color gamut, narrow emission bandwidths, broad color tunability, high photostability, and high air stability. [7] These excellent properties make QD a potential candidate for applications in various fields such as optoelectronics, sensing, and imaging. [1,8-10] QDs are typically composed of group II-VI, III-V, and IV-VI compound semiconductors such as CdS, CdSe, PbS, ZnS, InAs, and ZnInS. [11-16] Because of minimal particle diameter, QDs have a high surface-to-volume ratio, and these surface trap states act as centers for nonradiative transitions that diminish the performance of QDs. This can be overcome by the growth of inorganic shells such as ZnS, CdTe, and CdSe. Various core-shell QDs such as CdSe/ZnS,

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In Situ Characterization Techniques Applied in Photocatalysis: A Review

Meng

et al. 2022

Adv Materials Inter

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Photocatalysis, as one of the hopeful technologies to overcome the issues of energy shortage and environmental pollution, has increasingly attracted attention. In situ characterization technology, which can observe the dynamic changes of catalysts in photocatalytic reaction in real time, plays a crucial part in the development of designing highly efficient photocatalysts and investigating their mechanism. This review introduces and summarizes primary applications of in situ characterization techniques in photocatalysis, including in situ investigation of the morphology and chemical structure of photocatalysts, photogenerated charges transfer, spatial distribution, and surface reaction pathways. Suggestions for future development of in situ characterization techniques in photocatalysis have prospected at the end.

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Scanning Probe Characterization of Heterostructured Colloidal Nanomaterials

Cited by 33 publications

References 250 publications

Quantum Dot Solar Cells: Small Beginnings Have Large Impacts

Quantum Dot Solar Cells: Small Beginnings Have Large Impacts

Quantum Dots Microstructural Metrology: From Time‐Resolved Spectroscopy to Spatially Resolved Electron Microscopy

In Situ Characterization Techniques Applied in Photocatalysis: A Review

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