Plasmon resonance enhanced colloidal HgSe quantum dot filterless narrowband photodetectors for mid-wave infrared

Tang, Xin; Wu, Guangfu; Lai, King Wai Chiu

doi:10.1039/c6tc04248a

Cited by 119 publications

(110 citation statements)

References 41 publications

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“…Although various other optical structures have been studied and employed in the regular planar photodetectors, most of them cannot be used in a flexible detector due to the difficulty in large scale fabrication of nanostructures on flexible substrates. For example, we expect that plasmonic nanostructures that have been widely used to boost photoresponse from visible to mid‐infrared ranges in planar detectors by locally enhance light intensity may have a more limited use in flexible detectors compared to planar processes used in Fabry–Perot (FP) cavities. So far, light absorption enhancement for flexible detectors has rarely been reported.…”

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confidence: 99%

“…The peak D * is 7.5 × 10 10 Jones, which is remarkably high for a flexible SWIR detector at room temperature. Compared with other absorption enhancement methods, the FP cavity is an efficient optical structure with low fabrication complexity and full compatibility with bending. The overall performance of the flexible CQDs detector in this work is much better than any other flexible infrared detectors by the comparison of spectral sensing range, responsivity/EQE, peak D * , operation bandwidth, and bias voltage as shown in the Table S1 in the Supporting Information.…”

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confidence: 99%

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Towards Infrared Electronic Eyes: Flexible Colloidal Quantum Dot Photovoltaic Detectors Enhanced by Resonant Cavity

Tang

Ackerman

Shen

et al. 2019

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Electronic eye cameras are receiving increasing interest due to their unique advantages such as wide field of view, low aberrations, and simple imaging optics compared to conventional planar focal plane arrays. However, the spectral sensing ranges of most electronic eyes are confined to the visible, which is limited by the energy gaps of the sensing materials and by fabrication obstacles. Here, a potential route leading to infrared electronic eyes is demonstrated by exploring flexible colloidal quantum dot (CQD) photovoltaic detectors. Benefitting from their tunable optical response and the ease of fabrication as solution processable materials, mercury telluride (HgTe) CQD detectors with mechanical flexibility, wide spectral sensing range, fast response, and high detectivity are demonstrated. A strategy is provided to further enhance the light absorption in flexible detectors by integrating a Fabry–Perot resonant cavity. Integrated short‐wave IR detectors on flexible substrates have peak D* of 7.5 × 1010 Jones at 2.2 µm at room temperature and promise the development of infrared electronic eyes with high‐resolution imaging capability. Finally, infrared images are captured with the flexible CQD detectors at varying bending conditions, showing a practical approach to sensitive infrared electronic eyes beyond the visible range.

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confidence: 99%

Towards Infrared Electronic Eyes: Flexible Colloidal Quantum Dot Photovoltaic Detectors Enhanced by Resonant Cavity

Tang

Ackerman

Shen

et al. 2019

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“…Recently, mid‐wave infrared photodiodes, with high photoresponse (up to 0.8 A W −1 ), have been proposed by Guyot–Sionnest's group. Part of this success is based on the use of plasmon resonance to enhance the absorption of thin nanocrystal films with thicknesses below the absorption depth . Yet, their 5 µm cut‐off wavelength means that these devices still need to be cooled down to cryogenic temperatures to achieve a reasonable signal/noise ratio.…”

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confidence: 99%

HgTe Nanocrystal Inks for Extended Short‐Wave Infrared Detection

Martinez

Ramade

Livache

et al. 2019

Advanced Optical Materials

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Short‐wave infrared (IR) detection is currently driven by InGaAs technology which has limited the perspective of cost effectiveness and consequently slows the development of IR sensors. Since organic electronics are ineffective in this wavelength range, an alternative to conductive polymers is the use of colloidal quantum dots (CQDs) which exhibit strongly tunable IR absorption. In this paper, the extended short‐wave IR (2.5 µm cut‐off) is focused on to expand the capabilities of InGaAs, while using HgTe nanocrystals as the active material. Previous devices based on this material suffer from a low responsivity due to weak absorption (few percents). The integration of HgTe nanocrystals is presented in ink form to build thick (up to 600 nm), strongly absorbing nanoparticle films. This ink is integrated into a diode, allowing one to boost the responsivity by two orders of magnitude and the detectivity by one order of magnitude compared to previous HgTe devices at the same wavelength. Detectivity reaches 3 × 109 Jones, while the time response is found to be 370 ns for room temperature and 0 V bias operation. Finally, the material is integrated into a focal plane array which is used to determine laser beam profile.

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“…Among potential candidates, mercury chalcogenides (HgS 6,7 , HgSe [8][9][10] and HgTe 11 ) are the most mature materials, combining a tunable infrared absorption 12,13 with photoconductive 14 properties. In spite of huge progresses reported over the past decades 15 , which include the report of photovoltaic devices 16 , intraband transition based photodetector 1,17 , plasmonic devices 18,19 and multicolor devices 20,21 , no rational design of the material has been conducted.…”

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confidence: 99%

Probing Charge Carrier Dynamics to Unveil the Role of Surface Ligands in HgTe Narrow Band Gap Nanocrystals

et al. 2017

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Abstract:Colloidal nanocrystals are an interesting platform for the design of low cost optoelectronic devices especially in the infrared range of wavelengths. Mercury chalcogenides have reached high maturity to address wavelengths above the telecom range (1.5 µm). However, no screening of the surface chemistry influence has been conducted yet. In this paper, we systematically probe the influence of a series of ligands: Cl -, SCN -, 1,2 ethanedithiol, 1,4 benzenedithiol, 1 octanethiol, 1 butanethiol, As 2 S 3 , S 2-on the photoconductive properties of HgTe nanocrystal thin films. A high bandwidth, large dynamic transient photocurrent setup is used to determine the photocarrier dynamics. Two regimes are clearly identified. At early stage (few ns) a fast decay of the photocurrent is resulting from recombination and trapping. Then transport enters in a multiple trapping regime where carriers present a continuously decreasing effective value of their mobility. The power law dependence of the conductance can be used to estimate the trap carrier density and determine the value of the Urbach energy (35 to 50 meV). We demonstrate that a proper choice of ligand is necessary for a trade-off between the material performance (µτ product) and the quality of the surface passivation (to keep a low Urbach energy).

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Plasmon resonance enhanced colloidal HgSe quantum dot filterless narrowband photodetectors for mid-wave infrared

Abstract: HgSe CQD based narrowband photodetectors with plasmonic nano-disk arrays were developed for the detection of mid-wave infrared.

Cited by 119 publications

References 41 publications

Towards Infrared Electronic Eyes: Flexible Colloidal Quantum Dot Photovoltaic Detectors Enhanced by Resonant Cavity

Towards Infrared Electronic Eyes: Flexible Colloidal Quantum Dot Photovoltaic Detectors Enhanced by Resonant Cavity

HgTe Nanocrystal Inks for Extended Short‐Wave Infrared Detection

Probing Charge Carrier Dynamics to Unveil the Role of Surface Ligands in HgTe Narrow Band Gap Nanocrystals

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