Pulsed Laser Ablation based Direct Synthesis of Single‐Wall Carbon Nanotube/PbS Quantum Dot Nanohybrids Exhibiting Strong, Spectrally Wide and Fast Photoresponse

Ka, Ibrahima; Borgne, Vincent Le; Ma, Dongling; Khakani, My Alì El

doi:10.1002/adma.201203026

Cited by 55 publications

(51 citation statements)

References 29 publications

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“…58,59 Comparative studies on the use of organic and inorganic charge acceptor materials for PbS NCs have also been carried out. [60][61][62] Photoconductor devices fabricated via photosensitizing one dimensional (1D) nanomaterials with PbS NCs, including carbon nanotubes (CNTs) [63][64][65] and fullerene C60 nanorods, 53 benefit from the large donor/acceptor interface and also via harnessing plasmonic effects have been demonstrated. 66,67 PbS NC phototransistor devices.…”

Section: Restricting Attention To Recombination Centersmentioning

confidence: 99%

Lead sulphide nanocrystal photodetector technologies

2016

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2 Few other areas of study have uncovered the secrets of the universe like that of the interaction between light and matter, leading to many revolutionary scientific discoveries. The interaction of light, in particular with semiconducting materials, has enabled us to understand the behaviour of various fundamental phenomena and has laid the foundation of the optoelectronic systems that we rely on today. The majority of such systems necessitate the detection of light which is achieved via the use of photodetector devices. A photodetector converts incident photons into an electrical signal, which in the solid-state, is assembled together with an application-oriented readout integrated circuit (ROIC). Present-day commercially available photodetectors are typically made from gallium phosphide/silicon carbide (GaP)/(SiC), silicon (Si) and indium gallium arsenide/germanium (InGaAs)/(Ge) for detection in the ultraviolet (UV), visible and near-infrared (IR) regimes of the electromagnetic spectrum, respectively. For mid and far IR, lead sulphide (PbS), lead selenide (PbSe), indium antimonide (InSb), indium arsenide (InAs) and mercury cadmium telluride (HgCdTe) based photodetectors are commonly used. Photodetectors based on a photoemissive principle such as photomultiplier tubes (PMTs) are also widely used for ultrasensitive detection in the UV to near-IR spectral regime and are fabricated using alkali metals having a low workfunction. For applications demanding multispectral detection, 'two-colour' detectors are often manufactured with a bi-level structure, for example consisting of an IR transmitting Si photodiode mounted over an IR sensitive PbS photoconductor. Such a device structure has drawbacks that include added cost, increased complexity of device fabrication and associated issues in implementation. Furthermore, a significant majority of applications are based upon UV to near-IR light detection where the indirect bandgap of Si, the InGaAs epitaxial growth process, PMT bulkiness and high bias voltage requirement all present challenges and renders their use with flexible platforms impossible. As a result significant research effort continues to be expended on the development of a singlesystem multispectral photodetector to replace two or more detectors. In the last decade amongst all the candidate materials studied 1 PbS semiconductor nanocrystals (NCs), often referred as 'quantum dots', have emerged as the most promising material for the fabrication of 3 this type of photodetector. Such has been the progress in their development that reported PbS NC based photodetectors have already outperformed conventional state-of-the-art photodetectors in many aspects including low-cost room temperature device fabrication via solution processing, flexible substrate compatibility, broadband spectral sensitivity along with the figures of merit achieved, Fig 1a. In this review article, we present an overview of recent developments in PbS NC based photodetectors. We first provide a brief introduction to PbS NCs and their releva...

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Section: Restricting Attention To Recombination Centersmentioning

confidence: 99%

Lead sulphide nanocrystal photodetector technologies

2016

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“…Today, a proven strategy to procure better low cost materials is the combination of different nanomaterials1234567. Such hybrid nano-engineered materials are of great interest because they can often synergistically and controllably associate the advantageous physical, chemical and optical properties from each constituent to achieve better, novel and tunable functionalities234567.…”

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confidence: 99%

“…Such hybrid nano-engineered materials are of great interest because they can often synergistically and controllably associate the advantageous physical, chemical and optical properties from each constituent to achieve better, novel and tunable functionalities234567. In such hybrid systems, carbon nanotubes (CNTs) provide a useful building block based on their high electrical conductivity and unique physical properties467. Indeed, CNTs associated with quantum dots have previously shown significant improvement in photosensitizing device performances67.…”

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confidence: 99%

High-performance nanotube-enhanced perovskite photodetectors

Gerlein

Nechache

et al. 2017

Sci Rep

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Organic-inorganic perovskites have already shown a tremendous potential for low-cost light-harvesting devices. Yet, the relatively low carrier mobilities in bulk perovskites still prevent large-area devices with performances competing with state-of-the-art technologies. Here, we tackle this fundamental challenge by incorporating single-wall carbon nanotubes within a perovskite matrix by means of a simple two-step method in ambient air. Using this nano-engineered hybrid film, we demonstrate large-area photodetectors with responsivities up-to 13.8 A.W−1 and a broad spectral response from 300 to 800 nm, indicating that photocurrent generation arises from the charge transfer from the perovskite matrix to the embedded nanotube network. As the nanotubes facilitate the carrier extraction, these photodetectors also show a fast response time of 10 ms. This is significantly faster than most of previous reports on perovskite-based photodetectors, including devices with much smaller photosensitive areas. This approach is also well-suited for large-scale production of other perovskite-based light-harvesting devices.

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“…PLD is a synthesis method known to produce clean and uniform NPs over a surface, without the risk of chemical contamination that arises from chemical methods. It has been employed to decorate CNTs in several applications, including field effect emission [22] and optoelectronics [23,24]. We show that the PLD method yields clean nanohybrids (NHs) and that the SWCNTs films are left structurally intact after the deposition process.…”

Section: Introductionmentioning

confidence: 94%

Ag nanoparticle-decorated single wall carbon nanotube films for photovoltaic applications

Anouar

Jbilat

Borgne

et al. 2016

Mater Renew Sustain Energy

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We report on the use of pulsed laser deposition to decorate single wall carbon nanotube (SWCNTs) films with Ag nanoparticles (NPs) in hybrid SWCNTs/n-Si photovoltaic (PV) devices. PV devices are built by coating n-Si surfaces with a controlled density of a SWCNTs' suspension via an air-brush method. By adjusting the number of laser pulses (N Lp ) from the KrF laser, we are able to control the size and density of the Ag NPs covering the SWCNTs films. Through adjustment of N Lp , we are able to improve the power conversion efficiency of the SWCNTs/n-Si devices from 3.5 to over 6 % at N Lp = 1250 and the corresponding fill factor (FF) from 35 to 60 %. This increase is shown to be correlated with Raman, electrical and optical properties of the Ag NPs-coated SWCNTs films. UV-Vis spectroscopy measurements show the presence of optical scattering that is directly attributed to the presence of plasmon in the range of 450-600 nm and internal quantum efficiency measurement shows significant improvement over this range. In addition to this direct increase of the generate photocurrent, the overall Ag NPs film resistance is sufficiently lowered to ensure higher FF and thus a higher PCE. Beyond the optimal value of N Lp [ 1250, we show that the decreasing PCE is caused by low optical transmission of the Ag NPs films and poorer rectification.

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Pulsed Laser Ablation based Direct Synthesis of Single‐Wall Carbon Nanotube/PbS Quantum Dot Nanohybrids Exhibiting Strong, Spectrally Wide and Fast Photoresponse

Cited by 55 publications

References 29 publications

Lead sulphide nanocrystal photodetector technologies

Lead sulphide nanocrystal photodetector technologies

High-performance nanotube-enhanced perovskite photodetectors

Ag nanoparticle-decorated single wall carbon nanotube films for photovoltaic applications

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