Chalcogenidometallate Clusters as Surface Ligands for PbSe Nanocrystal Field-Effect Transistors

Ocier, Christian R.; Whitham, Kevin; Hanrath, Tobias; Robinson, Richard D.

doi:10.1021/jp406369a

Cited by 30 publications

(29 citation statements)

References 51 publications

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“…S 2-) results in unstable PbS QDs although these have shown promising results for the CdSe/ZnS QDs. [60] Furthermore, Ocier et al [88] reported that stabilizing PbSe QDs using MCCs was inherently difficult, but MCCs were applicable to PbS and PbTe NCs. Based on these studies, it is clear that the MCCs and metal-free chalcogenides have different interactions with various types of QDs and their mechanism has not been full elucidated till now.…”

Section: Metal Free Chalcogenide Complexmentioning

confidence: 99%

Near‐Infrared Active Lead Chalcogenide Quantum Dots: Preparation, Post‐Synthesis Ligand Exchange, and Applications in Solar Cells

et al. 2019

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Quantum dots (QDs) of lead chacogenides (e.g. PbS, PbSe and PbTe) are attractive near-infrared (NIR) active materials that show great potential in a wide range of applications such as photovoltaics (PV), optoelectronics, sensors, bio-electronics and many others. The successful utilization of these functional materials requires deep understanding of their synthesis, properties and material modification process. The surface ligand plays an essential role in the production of QDs, post-synthesis modification and their integration to practical applications. Therefore, it is critically important that the influence of surface ligands on the synthesis and property of QDs is well understood for their applications in various devices. Present review elaborates the application of colloidal synthesis techniques for the preparation of lead chalcogenide based QDs. We specifically focus on the influence of surface ligands on the synthesis of QDs and their solution phase ligand exchange. Given the importance of lead chalcogenide QDs as potential light harvesters, we also pay particular attention to the current progress of these QDs in PV applications. This review concludes by providing some important research directions for the future use of lead chalcogenide QDs in solar cells.

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Section: Metal Free Chalcogenide Complexmentioning

confidence: 99%

Near‐Infrared Active Lead Chalcogenide Quantum Dots: Preparation, Post‐Synthesis Ligand Exchange, and Applications in Solar Cells

et al. 2019

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“…104 In this case the stabilizing counter ion is hydrazinium. 106 Fluorescence blinking studies show that MCC capped NCs display long off times. 106 Fluorescence blinking studies show that MCC capped NCs display long off times.…”

Section: Ligand Orbital Mixingmentioning

confidence: 99%

Linking surface chemistry to optical properties of semiconductor nanocrystals

Krause

Kambhampati

2015

Phys. Chem. Chem. Phys.

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The intricate chemistry occurring at the surface of semiconductor nanocrystals is crucial to tailoring their optical properties to a myriad of applications. This perspective aims to re-evaluate long held ideas in semiconductor nanocrystal surface science in the light of a body of new and rich research. We start by reviewing recent developments in ligand chemistry, followed by a discussion of spectroscopic and computational approaches used for advancing the poorly-understood electronic structure of the surface. With the insights gained, we show how the surface impacts emissive behaviour and we summarize strategies to increase fluorescent quantum yield. This discussion is followed by a review of experimental approaches for quantitative analysis of the surface chemistry at concentrations relevant to spectroscopic measurements. We end by highlighting some new directions in ligand chemistry, namely all-inorganically passivated semiconductor nanocrystals and new applications of surface emission.

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“…[37] While past researchers have attempted to combine PbSe nanocrystals, metal chalcogenide complex treatments, and annealing procedures, this potential for nanocrystal coarsening prevented them from utilizing the full decomposition temperature of the metal chalcogenide complex. For example, Ocier et al [38] treated PbSe nanocrystals with the hydrazine-based tin selenide precursor, but limited his annealing temperature to 200°C as opposed to the full decomposition temperature of 350°C. [28] Since tin(IV) methylselenolate fully decomposes at an attractively low 200°C, this capability potentially opens up additional processing options for PbSe nanocrystals.…”

Section: Treatment Of Pbse Nanocrystal Thin Films With Tin(iv) Methylmentioning

confidence: 99%

Tin(IV) Methylselenolate as a Low Temperature SnSe Precursor and Conductive “Glue” Between Colloidal Nanocrystals

Vartak

Wang

2020

ChemNanoMat

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We report the synthesis of a soluble precursor that transforms into crystalline SnSe at 200 °C. This transformation temperature is significantly lower than the 270–350 °C range of previously reported tin selenide precursors. This precursor is synthesized by reacting tin with dimethyl diselenide and we identify the precursor as tin(IV) methylselenolate using a combination of mass spectrometry, Raman spectroscopy, and nuclear magnetic resonance spectroscopy. We then chemically treat PbSe colloidal nanocrystals with this precursor and subject them to mild annealing. We characterize the chemical and structural changes during this processing using infrared spectroscopy, aberration‐corrected scanning transmission electron microscopy, and X‐ray photoelectron spectroscopy. These characterization studies indicate the successful formation of a SnSe‐like material that fills the interstitial space between the PbSe nanocrystal cores. We find that the electrical conductivity of these nanocrystal films is comparable to other excellent treatments used to improve charge transport. This excellent charge transport demonstrates the utility of tin(IV) methylselenolate as a conductive “glue” between nanocrystals.

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Chalcogenidometallate Clusters as Surface Ligands for PbSe Nanocrystal Field-Effect Transistors

Cited by 30 publications

References 51 publications

Near‐Infrared Active Lead Chalcogenide Quantum Dots: Preparation, Post‐Synthesis Ligand Exchange, and Applications in Solar Cells

Near‐Infrared Active Lead Chalcogenide Quantum Dots: Preparation, Post‐Synthesis Ligand Exchange, and Applications in Solar Cells

Linking surface chemistry to optical properties of semiconductor nanocrystals

Tin(IV) Methylselenolate as a Low Temperature SnSe Precursor and Conductive “Glue” Between Colloidal Nanocrystals

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