One-step synthesis of near-infrared emitting and size tunable CuInS<sub>2</sub> semiconductor nanocrystals by adjusting kinetic variables

Xia, Chenghui; Cao, Lixin; Liu, Wei; Su, Ge; Gao, Rongjie; Qu, Hua; Shi, Liang; He, Guanghui

doi:10.1039/c4ce00889h

Cited by 25 publications

(16 citation statements)

References 52 publications

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“…The QY was calculated by the formula QY = N emit / N abs as described in the experimental section, where N emit stands for the emitted photons from the NCs and N abs for the absorbed photons by the NCs. The obtained QY value was higher than that of I‐III‐VI NCs in the literature at longer emission wavelength range …”

Section: Performance Of Sunlight and Transmitted Sunlight Through Lscscontrasting

confidence: 64%

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Chen

Liu

et al. 2017

Sol. RRL

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Low reabsorption, near infrared (NIR) emission, and heavy metal free are key trends for the nanocrystals (NCs) based luminescent solar concentrator (LSC). In this research, heavy metal free AgInS2/ZnS (AIS/ZnS) NCs have been synthesized and utilized by LSC technique with NIR emission for the first time. The AIS/ZnS demonstrated a tetragonal crystal phase and an NIR emission at 918 nm when the ratio of [Ag]:[In] = 1: 0.5 for metal elements in precursors. The quantum efficiency was also improved to 60.3% as the absolute quantum yield (QY) after inorganic surface passivation. Moreover, AIS/ZnS LSCs have been fabricated by in situ polymerization. Benefiting from low reabsorption by “large effective Stokes shift” and high emission efficiencies of the AIS/ZnS NCs, the optical power efficiency (OPE) of large area AIS/ZnS LSC reached to 3.94%, and interestingly, the LSC also revealed high color transmittance in the visible range, which could maintain high quality of the transmitted natural light with color rendering properties at above 97 for Ra, and correlated color temperature of around 4500 K. These NCs and related LSCs will play an important role in smart building integrated photovoltaics.

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Section: Performance Of Sunlight and Transmitted Sunlight Through Lscscontrasting

confidence: 64%

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Chen

Liu

et al. 2017

Sol. RRL

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“…The most widely investigated ternary copper chalcogenide composition is CIS, for which two stable crystal structures have been reported for NCs (Figure ). Small, quasispherical CIS NCs with the chalcopyrite crystal structure (roquesite CIS, Figure a, b, e) and visible‐to‐near‐IR‐tunable PL have been synthesized by direct synthesis protocols . The most common synthesis protocol for luminescent CIS NCs with diameters below 10 nm consists of heating a mixture of CuI (or CuAc), In(Ac) 3 , and DDT .…”

Section: Ternary Copper Chalcogenidesmentioning

confidence: 99%

Prospects of Colloidal Copper Chalcogenide Nanocrystals

2016

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Over the past few years, colloidal copper chalcogenide nanocrystals (NCs) have emerged as promising alternatives to conventional Cd and Pb chalcogenide NCs. Owing to their wide size, shape, and composition tunability, Cu chalcogenide NCs hold great promise for several applications, such as photovoltaics, lighting and displays, and biomedical imaging. They also offer characteristics that are unparalleled by Cd and Pb chalcogenide NCs, such as plasmonic properties. Moreover, colloidal Cu chalcogenide NCs have low toxicity, potentially lower costs, and excellent colloidal stability. This makes them attractive materials for the large-scale deployment of inexpensive, sustainable, and environmentally benign solution-processed devices. Nevertheless, the synthesis of colloidal Cu chalcogenide NCs, especially that of ternary and quaternary compositions, has yet to reach the same level of mastery as that available for the prototypical Cd chalcogenide based NCs. This review provides a concise overview of this rapidly advancing field, sketching the state of the art and highlighting the key challenges. We discuss recent developments in the synthesis of size-, shape-, and composition-controlled NCs of Cu chalcogenides, with emphasis in strategies to circumvent the limitations arising from the need to precisely balance the reactivities of multiple precursors in synthesizing ternary and quaternary compositions. In this respect, we show that topotactic cation-exchange reactions are a promising alternative route to complex multinary Cu chalcogenide NCs and hetero-NCs, which are not attainable by conventional routes. The properties and potential applications of Cu chalcogenide NCs and hetero-NCs are also addressed.

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“… 20 Nevertheless, to date high PLQYs (≥50%) have only been reported for CIS/ZnS and CIS/CdS core/shell QDs with core diameters below 4 nm and PL up to 750 nm. 17 − 19 , 21 − 24 Although luminescent CIS QDs larger than 4 nm have also been reported, 21 , 25 − 27 their size and shape dispersion is typically quite large due to the difficulty in balancing the reactivities of multiple precursors (In, Cu, S). 20 Partial topotactic Cu + for In 3+ cation exchange (CE) in template Cu 2- x S nanocrystals (NCs) has been recently established as an effective strategy to circumvent these limitations, 28 , 29 allowing the preparation of monodisperse luminescent CIS QDs and NCs of sizes and shapes that would not be easily attainable by direct routes.…”

Section: Introductionmentioning

confidence: 99%

“… 28 , 29 This creates new opportunities to expand the spectral tunability of CIS QDs, since WZ CIS QDs emit at lower energies than their CP counterparts. 30 The PLQY of bare CIS QDs is however low (<5–10% for CP CIS 17 − 20 , 22 − 24 , 26 , 27 , 31 and <1% for WZ CIS 30 ) due to nonradiative recombination at surface defects. Overgrowth of a zinc blende ZnS shell on CP CIS QDs has been shown to effectively passivate these surface defects, thereby increasing the PLQYs to values as high as 80%, while excellent stability is imparted with preservation of the inherently low toxicity of CIS QDs.…”

Section: Introductionmentioning

confidence: 99%

Highly Luminescent Water-Dispersible NIR-Emitting Wurtzite CuInS₂/ZnS Core/Shell Colloidal Quantum Dots

et al. 2017

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Copper indium sulfide (CIS) quantum dots (QDs) are attractive as labels for biomedical imaging, since they have large absorption coefficients across a broad spectral range, size- and composition-tunable photoluminescence from the visible to the near-infrared, and low toxicity. However, the application of NIR-emitting CIS QDs is still hindered by large size and shape dispersions and low photoluminescence quantum yields (PLQYs). In this work, we develop an efficient pathway to synthesize highly luminescent NIR-emitting wurtzite CIS/ZnS QDs, starting from template Cu2-xS nanocrystals (NCs), which are converted by topotactic partial Cu+ for In3+ exchange into CIS NCs. These NCs are subsequently used as cores for the overgrowth of ZnS shells (≤1 nm thick). The CIS/ZnS core/shell QDs exhibit PL tunability from the first to the second NIR window (750–1100 nm), with PLQYs ranging from 75% (at 820 nm) to 25% (at 1050 nm), and can be readily transferred to water upon exchange of the native ligands for mercaptoundecanoic acid. The resulting water-dispersible CIS/ZnS QDs possess good colloidal stability over at least 6 months and PLQYs ranging from 39% (at 820 nm) to 6% (at 1050 nm). These PLQYs are superior to those of commonly available water-soluble NIR-fluorophores (dyes and QDs), making the hydrophilic CIS/ZnS QDs developed in this work promising candidates for further application as NIR emitters in bioimaging. The hydrophobic CIS/ZnS QDs obtained immediately after the ZnS shelling are also attractive as fluorophores in luminescent solar concentrators.

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One-step synthesis of near-infrared emitting and size tunable CuInS₂ semiconductor nanocrystals by adjusting kinetic variables

Abstract: This paper aims to systematically optimize the preparation process of CuInS2 (CIS) QDs by intensively manipulating kinetic variables including reaction temperature, reaction time, In/Cu ratio and surface ligand.

Cited by 25 publications

References 52 publications

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Highly Luminescent Water-Dispersible NIR-Emitting Wurtzite CuInS₂/ZnS Core/Shell Colloidal Quantum Dots

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One-step synthesis of near-infrared emitting and size tunable CuInS2 semiconductor nanocrystals by adjusting kinetic variables

Abstract: This paper aims to systematically optimize the preparation process of CuInS2 (CIS) QDs by intensively manipulating kinetic variables including reaction temperature, reaction time, In/Cu ratio and surface ligand.

Cited by 25 publications

References 52 publications

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Heavy Metal Free Nanocrystals with Near Infrared Emission Applying in Luminescent Solar Concentrator

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Highly Luminescent Water-Dispersible NIR-Emitting Wurtzite CuInS2/ZnS Core/Shell Colloidal Quantum Dots

Contact Info

Product

Resources

About

One-step synthesis of near-infrared emitting and size tunable CuInS₂ semiconductor nanocrystals by adjusting kinetic variables

Highly Luminescent Water-Dispersible NIR-Emitting Wurtzite CuInS₂/ZnS Core/Shell Colloidal Quantum Dots