Efficient photocatalytic and photovoltaic applications with nanocomposites between CdTe QDs and an NTU-9 MOF

Kaur, Rajnish; Rana, Aniket; Singh, Rajan Kumar; Chhabra, Varun A.; Kim, Ki‐Hyun; Deep, Akash

doi:10.1039/c7ra04125j

Cited by 50 publications

(15 citation statements)

References 68 publications

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“…QDs are prominent photoactive materials with broad adsorption band and effective exciton generation and present a bright prospect for solar cells with relatively lower cost compared to silicon. A research innovatively combined CdTe QDs with MOF NTU-9, whose band gap is comparable to that of semiconductive TiO 2 [ 20 ]. The CdTe/NTU-9 composite was used as photosensitizer in photoanode of a dye-sensitized solar cell and yielded a photoelectric conversion efficiency (PCE) up to 3.20%, much higher than 1.67% obtained with CdTe alone.…”

Section: Photoconductivitymentioning

confidence: 99%

Conductive MOFs with Photophysical Properties: Applications and Thin-Film Fabrication

Zhuang

Liu

2020

Nano-Micro Lett.

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HIGHLIGHTS • An overview on photophysical properties of conductive metal-organic frameworks (MOFs) including photoconductivity and photoluminescence is provided. • Miscellaneous applications of MOFs with photophysical properties are discussed. • Recent advances in integration of photoactive MOFs with practical devices are summarized. ABSTRACT Metal-organic frameworks (MOFs) are a class of hybrid materials with many promising applications. In recent years, lots of investigations have been oriented toward applications of MOFs in electronic and photoelectronic devices. While many high-quality reviews have focused on synthesis and mechanisms of electrically conductive MOFs, few of them focus on their photophysical properties. Herein, we provide an in-depth review on photoconductive and photoluminescent properties of conductive MOFs together with their corresponding applications in solar cells, luminescent sensing, light emitting, and so forth. For integration of MOFs with practical devices, recent advances in fabrication of photoactive MOF thin films are also summarized.

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Section: Photoconductivitymentioning

confidence: 99%

Conductive MOFs with Photophysical Properties: Applications and Thin-Film Fabrication

Zhuang

Liu

2020

Nano-Micro Lett.

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“…Remarkably, the implementation of CdTe@Eu-MOF sensitizer in complete device led to a significant decrease in charge recombination allowing to obtain an 80% photoconversion efficiency compared to device not embodying Eu-MOF (i.e., 3.0% vs. 1.7%, respectively). The same authors replaced the Eu-based MOF with a Ti-based one (namely NTU-9) that allowed to obtain a more broadened absorption spectra leading to quite good results [154]. Even if they recorded very high photocurrent density (up to 23 mA•cm −2 ), the devices suffer for very low FF, lower than 30%.…”

Section: Mofs As Sensitizersmentioning

confidence: 99%

Application of Metal-Organic Frameworks and Covalent Organic Frameworks as (Photo)Active Material in Hybrid Photovoltaic Technologies

et al. 2020

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Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) are two innovative classes of porous coordination polymers. MOFs are three-dimensional materials made up of secondary building blocks comprised of metal ions/clusters and organic ligands whereas COFs are 2D or 3D highly porous organic solids made up by light elements (i.e., H, B, C, N, O). Both MOFs and COFs, being highly conjugated scaffolds, are very promising as photoactive materials for applications in photocatalysis and artificial photosynthesis because of their tunable electronic properties, high surface area, remarkable light and thermal stability, easy and relative low-cost synthesis, and structural versatility. These properties make them perfectly suitable for photovoltaic application: throughout this review, we summarize recent advances in the employment of both MOFs and COFs in emerging photovoltaics, namely dye-sensitized solar cells (DSSCs) organic photovoltaic (OPV) and perovskite solar cells (PSCs). MOFs are successfully implemented in DSSCs as photoanodic material or solid-state sensitizers and in PSCs mainly as hole or electron transporting materials. An innovative paradigm, in which the porous conductive polymer acts as standing-alone sensitized photoanode, is exploited too. Conversely, COFs are mostly implemented as photoactive material or as hole transporting material in PSCs.

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“…Besides, because it is difficult to determine nanocrystal sizes smaller than 2.5 nm by transmission electron microscopy [15], the optical absorption and PL spectroscopy are especially useful and largely employed in estimating QD sizes. Among the many applications for QDs [16][17][18][19][20][21][22][23], their application in sensor devices has been calling attention in the last decades [24][25][26][27][28][29] due to the possibility of obtaining devices containing materials with nanoscopic dimensions, which reduces manufacturing costs and improves sensing efficiency. For instance, it has been reported that the luminescence intensity from CdSe QD monolayers is increased by the interaction of water molecules adsorbed on their surface [30], and the luminescence is not influenced by dry gases such as CO 2 , N 2 , Ar and O 2 .…”

Section: Introductionmentioning

confidence: 99%

Optical oxygen sensing by MPA-capped CdTe quantum dots immobilized in mesoporous silica

Ravaro

Ford

Camargo

2020

Microporous and Mesoporous Materials

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A novel nanocomposite luminescent material was prepared by taking advantage of the versatile wet impregnation method for the dispersion of CdTe quantum dots (QDs) into mesoporous silica host matrix and thus providing great interaction between oxygen and QDs, with potential application in an optical oxygen sensor. The optical/spectroscopic properties of the QDs suspended in aqueous media and incorporated in mesoporous silica were evaluated as a function of aging time, temperature variation and oxygen concentration. Luminescence quenching studies were carried out for both QDs suspended in solution and loaded into the silica matrix, in the presence of varying O 2 concentration. By Stern-Volmer plot analysis, obtained at different temperatures, it was possible to verify the existence of two types of emission quenching mechanisms for CdTe QDs. After aging for 120 days at room temperature, the QDs in colloidal suspension displayed a small red-shifted emission, which was interpreted as a decreased bandgap energy owing to the increase in the nanocrystal size. In contrast, the emission spectrum of CdTe QDs loaded into the mesoporous SiO 2 matrix remained unchanged after aging for the same time at ambient temperature. The presented results will contribute to the discernment of oxygen quenching mechanisms and chemical stability of optical sensors based on CdTe QDs.

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Efficient photocatalytic and photovoltaic applications with nanocomposites between CdTe QDs and an NTU-9 MOF

Abstract: CdTe QDs + NTU-9 MOF as a novel photoanode to improve the efficiency of a QD cell by about 1.5%.

Cited by 50 publications

References 68 publications

Conductive MOFs with Photophysical Properties: Applications and Thin-Film Fabrication

Conductive MOFs with Photophysical Properties: Applications and Thin-Film Fabrication

Application of Metal-Organic Frameworks and Covalent Organic Frameworks as (Photo)Active Material in Hybrid Photovoltaic Technologies

Optical oxygen sensing by MPA-capped CdTe quantum dots immobilized in mesoporous silica

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