Megahertz-frequency large-area optical modulators at 1.55 μm based on solution-cast colloidal quantum dots

Hoogland, Sjoerd; Sukhovatkin, Vlad; Shukla, Harnik; Clifford, Jason P.; Levina, Larissa; Sargent, Edward H.

doi:10.1364/oe.16.006683

Cited by 17 publications

(9 citation statements)

References 13 publications

(20 reference statements)

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“…In light of the highly desirable ease of processing and integration of colloidal quantum dots with a wide range of substrates, one might have assumed that performance might have to be traded off in favor of low cost and convenience; however, record D* photodetectors [23] and high power conversion efficiency photovoltaics [13,15] suggest otherwise. One might still assume that, while low cost, large area, integrability, and sensitivity or efficiency could be combined, perhaps speed of response could not be added to the mix; however, MHz speeds of response from infrared optical modulators [34] prove otherwise. Finally, one might suppose that a new materials system optimized to open up a new spectral regime -especially the SWIR -might automatically be relegated to niche applications; however, high visible-wavelength efficiencies [13,15] and sensitivities [24] prove the power and robustness of the widest quantum size-effect tuning.…”

Section: Prospectsmentioning

confidence: 99%

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Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

2008

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Optoelectronic devices made via spin‐coating of soft materials onto an arbitrary substrate enable ready integration, low cost, and physical flexibility. The use of solution‐processed colloidal quantum dots offers the added advantage of quantum‐size‐effect tuning of material bandgap. Tuning across the near‐ and short‐wavelength infrared (SWIR) spectral regions enables applications in fiber‐optic communications, night vision and biomedical imaging, and efficient solar energy collection. Here we review progress in infrared solar cells, light sensors, and optical sources based on solution‐processed materials. The latest solution‐processed photovoltaics now provide 4.2% power conversion efficiencies in the infrared, placing them a factor of three away from enabling a doubling in overall solar power conversion efficiency of visible‐wavelength solution‐processed photovoltaics. The best solution‐processed photodetectors now provide sensitivities of 1013 Jones D* (normalized detectivity), exceeding the sensitivity of the best epitaxially grown SWIR photodetectors. Infrared optical sources, both broadband light‐emitting diodes and, more recently, lasers, have now also been reported at 1.5 µm.

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Section: Prospectsmentioning

confidence: 99%

“…A recent report [34] details a simple solution-processed infrared optical modulator that combines straightforward solution-processing; modulation at 1.55 mm of particular interest in communications; 30% modulation depth; and 120 kHz modulation bandwidth with significant modulation depth out to 1 MHz.…”

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confidence: 99%

Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

2008

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“…Photodetectors, a class of optoelectronic devices that measure optical power by converting the incident light into current or voltage outputs, are widely applied as an essential part of spectroscopy, telecommunication, biological imaging and night vision 1 , 2 , 3 , 4 , 5 . Photodetectors can be approximately categorized as broadband or selective.…”

Section: Introductionmentioning

confidence: 99%

Broadband, sensitive and spectrally distinctive SnS2 nanosheet/PbS colloidal quantum dot hybrid photodetector

et al. 2016

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Photodetectors convert photons into current or voltage outputs and are thus widely used for spectroscopy, imaging and sensing. Traditional photodetectors generally show a consistent-polarity response to incident photons within their broadband responsive spectrum. Here we introduced a new type of photodetector employing SnS2 nanosheets sensitized with PbS colloidal quantum dots (CQDs) that are not only sensitive (~105 A W−1) and broadband (300–1000 nm) but also spectrally distinctive, that is, show distinctive (positive or negative) photoresponse toward incident photons of different wavelengths. A careful mechanism study revealed illumination-modulated Schottky contacts between SnS2 nanosheets and Au electrodes, altering the photoresponse polarity toward incident photons of different wavelengths. Finally, we applied our SnS2 nanosheet/PbS CQDs hybrid photodetector to differentiate the color temperature of emission from a series of white light-emitting diodes (LEDs), showcasing the unique application of our novel photodetectors.

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“…Light detection in the ultraviolet (UV), visible and infrared (IR) regimes has a wide range of commercial and scientific applications that include imaging,1 spectroscopy,2 communication,3 biomedical applications,4, 5 and night vision 6. Today commercially available photodetectors are typically made from silicon carbide (SiC), silicon (Si) and indium gallium arsenide (InGaAs) for detection in UV, visible and near‐IR regimes, respectively.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of PbS Nanocrystal:C₆₀ Fullerite Broadband Photodetectors with High Detectivity

Saran

Nordin

Curry

2013

Adv Funct Materials

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Hybrid PbS nanocrystal/C 60 fullerite photodetectors are fabricated using a simple one-step drop casting procedure onto pre-patterned interdigitated electrodes. The devices exhibit a broad spectral response from the near UV through to the near infrared yielding a detectivity, D * , of above 10 10 Jones from 400 nm to ≈ 1050 nm. The ability to further extend the spectral response to wavelengths ≈ 1350 nm in the near infrared via tuning of the PbS nanocrystal diameter is also demonstrated. The dynamic responses of the devices are presented, exhibiting a fast photocurrent rise time ( < 40 ns) followed by a long bi-exponential decay with characteristic lifetimes of τ 1 = 5.3 μ s ± 0.1 μ s and τ 2 = 37.8 μ s ± 0.7 μ s. These devices, which have a detectivity approaching that of commercial detectors, a broader spectral response, and a fast rise time, offer an attractive low-cost solution for large-area broadband photodetectors.

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Megahertz-frequency large-area optical modulators at 1.55 μm based on solution-cast colloidal quantum dots

Cited by 17 publications

References 13 publications

Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

Broadband, sensitive and spectrally distinctive SnS2 nanosheet/PbS colloidal quantum dot hybrid photodetector

Facile Fabrication of PbS Nanocrystal:C₆₀ Fullerite Broadband Photodetectors with High Detectivity

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Megahertz-frequency large-area optical modulators at 1.55 μm based on solution-cast colloidal quantum dots

Cited by 17 publications

References 13 publications

Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

Solar Cells, Photodetectors, and Optical Sources from Infrared Colloidal Quantum Dots

Broadband, sensitive and spectrally distinctive SnS2 nanosheet/PbS colloidal quantum dot hybrid photodetector

Facile Fabrication of PbS Nanocrystal:C60 Fullerite Broadband Photodetectors with High Detectivity

Contact Info

Product

Resources

About

Facile Fabrication of PbS Nanocrystal:C₆₀ Fullerite Broadband Photodetectors with High Detectivity