Integrating Sphere Microscopy for Direct Absorption Measurements of Single Nanostructures

Mann, Sander A.; Sciacca, Beniamino; Zhang, Yunyan; Wang, Jia; Kontoleta, Evgenia; Liu, Huiyun; Garnett, Erik C.

doi:10.1021/acsnano.6b06534

Cited by 34 publications

(39 citation statements)

References 32 publications

(49 reference statements)

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“…To measure medium absorption and scattering independently, an integrating sphere surrounding the measurement chamber can be used 10 . This approach is appropriate for both homogeneous samples 11 and nanometer size targets 12 , but is very sensitive to sample size, sample position within the sphere, and the type of chamber. Calibration is required for all wavelengths and full quantitation requires a detailed scattering model inside the sample.…”

Section: Introductionmentioning

confidence: 99%

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

Pelivanov

Петрова

Yoon

et al. 2018

Sci Rep

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Optical instruments can probe physical systems even to the level of individual molecules. In particular, every molecule, solution, and structure such as a living cell has a unique absorption spectrum representing a molecular fingerprint. This spectrum can help identify a particular molecule from others or quantify its concentration; however, scattering limits molecular fingerprinting within a complex compound and must be overcome. Here, we present a new, non-contact photoacoustic (PA)-based method that can almost completely remove the influence of background light scattering on absorption measurements in heterogeneous highly scattering solutions and, furthermore, separate the intrinsic absorption of nanoscale objects from their scattering. In particular, we measure pure absorption spectra for solutions of gold nanorods (GNRs) as an example of a plasmonic agent and show that these spectra differ from the extinction measured with conventional UV-VIS spectrophotometry. Finally, we show how the original GNR absorption changes when nanoparticles are internalized by cells.

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Section: Introductionmentioning

confidence: 99%

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

Pelivanov

Петрова

Yoon

et al. 2018

Sci Rep

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“…While the infiltrated pattern layer is expected to also reduce reflectance due to the better index matching with air ( We have measured the light absorption of the free-standing membrane with ARC on the unpatterned and patterned regions by using an integrating sphere microscope. 51,52 The curves in Fig. 1c…”

mentioning

confidence: 98%

“…Hyperuniform disorded (HUD) media are statistically isotropic and possess a constrained randomness such that density fluctuations on large scales behave more like those of ordered solids, rather than those of conventional amorphous materials. [27][28][29][30] HUD patterns naturally arise in many physical systems, from the mass distribution in the early universe, 31 structure of prime numbers, 32 hydrodynamics, 33 structure of amorphous ices, 34 sheared sedimenting suspensions, 35 to wave localisation 36 or colloidal packing. 37 When translated into photonic materials, HUDs exhibit large and robust photonic band gaps as in photonic crystals, but are both complete and isotropic.…”

mentioning

confidence: 99%

Over 65% sunlight absorption in a 1 μm Si slab with hyperuniform texture

Tavakoli¹,

Spalding²,

Koppejan³

et al. 2020

Preprint

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Thin, flexible and invisible solar cells will be an ubiquitous technology in the near future. Ultrathin crystalline silicon (c-Si) cells capitalise on the success of bulk silicon cells while being light-weight and mechanically flexible, but suffer from poor absorption and efficiency. Here we present a new family of surface texturing, based on correlated disordered hyperuniform patterns, capable of efficiently coupling the incident spectrum into the silicon slab optical modes. We experimentally demonstrate 66.5% solar light absorption in free-standing 1 µm c-Si layers by hyperuniform nanostructuring. The absorption equivalent photocurrent derived from our measurements is 26.3 mA/cm2, which is far above the highest found in literature for Si of similar thickness. Considering state-of-the-art Si PV technologies, the enhanced light trapping translates to a record efficiency above 15%. The light absorption can potentially be increased up to 33.8 mA/cm2 by incorporating a back-reflector and improved anti-reflection, for which we estimate a photovoltaic efficiency above 21% for 1 µm thick Si cells.

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“… 51 To obtain spatially resolved PLQY measurements of single nanowires, we used integrating sphere microscopy. 52 , 53 This technique allows us to determine quantitatively the spatially resolved absorptance, by using an integrating sphere to measure all nonabsorbed light and a glass sample holder on a piezo-stage to scan the sample across the laser beam. Additionally, by placing filters in front of the integrating sphere and reflection photodetectors, we can measure the photoluminescence quantitatively, as well.…”

mentioning

confidence: 99%

Perovskite Nanowire Extrusion

et al. 2017

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The defect tolerance of halide perovskite materials has led to efficient optoelectronic devices based on thin-film geometries with unprecedented speed. Moreover, it has motivated research on perovskite nanowires because surface recombination continues to be a major obstacle in realizing efficient nanowire devices. Recently, ordered vertical arrays of perovskite nanowires have been realized, which can benefit from nanophotonic design strategies allowing precise control over light propagation, absorption, and emission. An anodized aluminum oxide template is used to confine the crystallization process, either in the solution or in the vapor phase. This approach, however, results in an unavoidable drawback: only nanowires embedded inside the AAO are obtainable, since the AAO cannot be etched selectively. The requirement for a support matrix originates from the intrinsic difficulty of controlling precise placement, sizes, and shapes of free-standing nanostructures during crystallization, especially in solution. Here we introduce a method to fabricate free-standing solution-based vertical nanowires with arbitrary dimensions. Our scheme also utilizes AAO; however, in contrast to embedding the perovskite inside the matrix, we apply a pressure gradient to extrude the solution from the free-standing templates. The exit profile of the template is subsequently translated into the final semiconductor geometry. The free-standing nanowires are single crystalline and show a PLQY up to ∼29%. In principle, this rapid method is not limited to nanowires but can be extended to uniform and ordered high PLQY single crystalline perovskite nanostructures of different shapes and sizes by fabricating additional masking layers or using specifically shaped nanopore endings.

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Integrating Sphere Microscopy for Direct Absorption Measurements of Single Nanostructures

Cited by 34 publications

References 32 publications

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

Over 65% sunlight absorption in a 1 μm Si slab with hyperuniform texture

Perovskite Nanowire Extrusion

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