Aqueous‐Processable Noncovalent Chemically Converted Graphene–Quantum Dot Composites for Flexible and Transparent Optoelectronic Films

Geng, Xueli; Niu, Liang; Xing, Zhenyuan; Song, Rensheng; Liu, Guangtong; Sun, Mengtao; Cheng, Guosheng; Zhong, Haizhe; Liu, Zhenghui; Zhang, Zhijun; Sun, Lianfeng; Xu, Hongxing; Li, Lu; Liu, Liwei

doi:10.1002/adma.200902871

Cited by 294 publications

(176 citation statements)

References 33 publications

(34 reference statements)

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“…The immobilized CdSe displayed a photoconductivity about ten orders of magnitude higher than that of the pristine CdSe QD arrays. [30] It has also been found that TiO 2 deposited on RGO plates remarkably enhanced its performance in dye-sensitized solar cells [33] and in photocatalytic reactions. [32] The work function of RGO is slightly larger than that of TiO 2 , [1] which makes it effective for separation of photogenerated electron-hole pairs and transfer of the electrons to other acceptors.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Induced Dye Degradation over Copper‐Modified Reduced Graphene Oxide

Xiong

Zhang

Xin

2011

Chemistry A European J

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Previously, it was found that reduced graphene oxide (RGO) can degrade rhodamine B (RhB) under visible-light irradiation, but with an extraordinarily slow rate. It was also found that modification of RGO with gold nanoparticles can dramatically accelerate the photoreaction rate. Herein, we describe the preparation and photocatalytic properties of copper-ion-modified RGO composite materials, which display a faster photocatalytic reaction rate and better mineralization under visible-light irradiation than gold-modified RGO. The copper-ion-modified RGO composites were prepared by an immersion method. The characterization results of X-ray diffraction, transmission electron microscopy, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy show the presence of crystalline copper species Cu(2)(OH)(3)NO(3) and Cu(2)(OH)(3)Cl on the surface of RGO. Modification of RGO with the copper species greatly enhances the degradation of RhB--after 3 hours of reaction under visible-light irradiation, the total organic carbon is decreased by about 31%. The copper species act as an electron relay, passing the excited electrons from the RGO sheets to adsorbed oxygen, thus leading to continuous generation of reactive oxygen species for the degradation of RhB.

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Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Induced Dye Degradation over Copper‐Modified Reduced Graphene Oxide

Xiong

Zhang

Xin

2011

Chemistry A European J

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“…24,25 Herein, we report the in situ synthesis of CdSe NCs in a functionalized graphene matrix, wherein the strategy of in situ growing CdTe NCs onto a P3HT matrix has been adopted. 11 The f-GCdSe nanocomposite shows a very fast and dramatically enhanced photoresponse, which makes it an excellent electron-acceptor material for OPV devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and optoelectrical properties of f-graphene/cadmium selenide hybrid system

et al. 2015

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Abstract. The present work demonstrates the synthesis of a hybrid accepter material containing amino-functionalized graphene oxide (GO) and an inorganic semiconducting material, cadmium selenide (CdSe). First, amino-functionalized graphene was synthesized and then nanocrystals (NCs) of CdSe were in situ grown in the functionalized-(GO) matrix named f-GCdSe. Structural studies such as x-ray diffraction, and a scanning electron microscopic were employed to investigate the growth of CdSe NCs in the graphene matrix. To understand the charge generation and transfer process at the donor/acceptor interface, the absorption, photoluminescence (PL), and transient absorption spectroscopic (TAS) studies have been carried out in poly(3-hexylthiophene) (P3HT)/f-GCdSe thin films. PL quenching in P3HT/f-GCdSe thin film suggests that charge transfer takes place at the donor/acceptor interface. TAS shows higher optical density and long lived free carriers for P3HT/f-GCdSe thin film. These results suggest that f-GCdSe is an excellent electron-acceptor material for organic photovoltaic devices.

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“…[1][2][3][4] The solutionbased process also has provided high feasibility of realizing flexible and large scale photovoltaic devices with costeffective fabrication. [5][6][7][8] Despite these favorable characteristics, poor charge transport and imperfect surface status of CQDs hinder high photovoltaic performance compared to the theoretical conversion efficiency. During the synthetic process, CQDs are capped by long and bulky organic ligands which enable to control the size of CQDs by preventing over-size aggregation and enhancing chemical stability.…”

mentioning

confidence: 99%

Inorganic-ligand exchanging time effect in PbS quantum dot solar cell

Kim

Hong

Hou

et al. 2016

Applied Physics Letters

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We investigate time-dependent inorganic ligand exchanging effect and photovoltaic performance of lead sulfide (PbS) nanocrystal films. With optimal processing time, volume shrinkage induced by residual oleic acid of the PbS colloidal quantum dot (CQD) was minimized and a crack-free film was obtained with improved flatness. Furthermore, sufficient surface passivation significantly increased the packing density by replacing from long oleic acid to a short iodide molecule. It thus facilities exciton dissociation via enhanced charge carrier transport in PbS CQD films, resulting in the improved power conversion efficiency from 3.39% to 6.62%. We also found that excess iodine ions on the PbS surface rather hinder high photovoltaic performance of the CQD solar cell.

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Aqueous‐Processable Noncovalent Chemically Converted Graphene–Quantum Dot Composites for Flexible and Transparent Optoelectronic Films

Cited by 294 publications

References 33 publications

Visible‐Light‐Induced Dye Degradation over Copper‐Modified Reduced Graphene Oxide

Visible‐Light‐Induced Dye Degradation over Copper‐Modified Reduced Graphene Oxide

Synthesis and optoelectrical properties of f-graphene/cadmium selenide hybrid system

Inorganic-ligand exchanging time effect in PbS quantum dot solar cell

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