Correlating Light Absorption with Various Nanostructure Geometries in Vertically Aligned Si Nanowire Arrays

Park, Yiseul; Lee, Jin Seok

doi:10.1021/acsphotonics.7b01018

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…Ultraviolet-visible (UV-Vis) relative differential reflectance spectra analysis in SI Appendix, Fig. S20 shows that GaN NWs enhance the sunlight absorption of the n + -p silicon junction in a wide wavelength range, due to the light trapping effect (57). In addition, as shown in the energy diagram in SI Appendix, Fig.…”

Section: Synthesis and Characterization Of The Binary Cufe Electrocatmentioning

confidence: 96%

Highly efficient binary copper−iron catalyst for photoelectrochemical carbon dioxide reduction toward methane

Zhou

Pant

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

119

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A rational design of an electrocatalyst presents a promising avenue for solar fuels synthesis from carbon dioxide (CO2) fixation but is extremely challenging. Herein, we use density functional theory calculations to study an inexpensive binary copper−iron catalyst for photoelectrochemical CO2 reduction toward methane. The calculations of reaction energetics suggest that Cu and Fe in the binary system can work in synergy to significantly deform the linear configuration of CO2 and reduce the high energy barrier by stabilizing the reaction intermediates, thus spontaneously favoring CO2 activation and conversion for methane synthesis. Experimentally, the designed CuFe catalyst exhibits a high current density of −38.3 mA⋅cm−2 using industry-ready silicon photoelectrodes with an impressive methane Faradaic efficiency of up to 51%, leading to a distinct turnover frequency of 2,176 h−1 under air mass 1.5 global (AM 1.5G) one-sun illumination.

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Section: Synthesis and Characterization Of The Binary Cufe Electrocatmentioning

confidence: 96%

Highly efficient binary copper−iron catalyst for photoelectrochemical carbon dioxide reduction toward methane

Zhou

Pant

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

119

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“…To understand this difference, we studied the morphology of the etched structures. Even minor changes in morphology are known to significantly affect the optical absorption of NWs. − Thus, we performed SEM on NWs after forcing In 2 O 3 /SiNWs to lay horizontally on the substrate for a thorough inspection of morphology. Detailed SEM images of such In 2 O 3 -coated SiNWs are provided in the Supporting Information Figure S9.…”

Section: Resultsmentioning

confidence: 99%

Electrostatically Doped Silicon Nanowire Arrays for Multispectral Photodetectors

Solanki

Jayaraman

et al. 2019

ACS Nano

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Nanowires have promising applications as photodetectors with superior ability to tune absorption with morphology. Despite their high optical absorption, the quantum efficiencies of these nanowire photodetectors remain low due to difficulties in fabricating a shallow junction using traditional doping methods. As an alternative, we report nonconventional radial heterojunction photodiodes obtained by conformal coating of an indium oxide layer on silicon nanowire arrays. The indium oxide layer has a high work function which induces a strong inversion in the silicon nanowire and creates a virtual p−n junction. The resulting nanowire photodetectors show efficient carrier separation and collection, leading to an improvement of quantum efficiency up to 0.2. In addition, by controlling the nanowire radii, the spectral responses of the In 2 O 3 /Si nanowire photodetectors are tuned over several visible light wavelengths, creating a multispectral detector. Our approach is promising for the development of highly efficient wavelength-selective photodetectors.

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“…Up to now, the evaluation of light absorption of single micro/nanowires relies either on indirect measurement or theoretical models, which can only provide qualitative values 28 – 35 . Experimental methods for probing light absorption such as monitoring the photocurrent generated within single wire devices are time-consuming and require complicated microelectrodes fabrication process 36 – 41 . In addition, we have shown that the real nanowire absorption deviates significantly from the theoretical prediction calling for caution in using these equations or simulation results.…”

Section: Resultsmentioning

confidence: 99%

Directly Probing Light Absorption Enhancement of Single Hierarchical Structures with Engineered Surface Roughness

Wang

Shi

Cai

et al. 2018

Sci Rep

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Hierarchical nanostructures are ideal architectures to harvest solar energy. The understanding of light absorption in single hierarchical structures is emergently important and greatly helpful in enhancing multiscale optical phenomena and light management. However, due to the geometrical complexity of hierarchical architectures, theoretical and experimental studies of light absorption have faced significant challenges. Here, we directly quantify light absorption in single hierarchical structures for the first time by utilizing VO2-based near field powermeter. It is found that light trapping is significantly enhanced in rough microwires when the roughness amplitude is comparable to the incident light wavelength. The roughness enhanced light absorption is verified as a general phenomenon on both VO2 and Si hierarchical structures. Therefore, our work not only provides a simple and quantitative method of measuring light absorption upon single geometrically complex structures in micro/nanoscale, but also contributes a general rule to rationally design of hierarchical structures for enhanced performance in photoelectric and photochemical applications.

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Correlating Light Absorption with Various Nanostructure Geometries in Vertically Aligned Si Nanowire Arrays

Cited by 9 publications

References 46 publications

Highly efficient binary copper−iron catalyst for photoelectrochemical carbon dioxide reduction toward methane

Highly efficient binary copper−iron catalyst for photoelectrochemical carbon dioxide reduction toward methane

Electrostatically Doped Silicon Nanowire Arrays for Multispectral Photodetectors

Directly Probing Light Absorption Enhancement of Single Hierarchical Structures with Engineered Surface Roughness

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