Efficient light trapping in tapered silicon nanohole arrays

Zhang, Anjun; Guo, Zhongyi

doi:10.1016/j.ijleo.2015.12.001

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…The cross-sectional image of the graphene/SiNH structures is presented in Figure c, showing that the SiNHs are vertically aligned and the depths of them are about 1–2 μm. Besides, such SiNHs exhibit an inverted taper shape, which enables an excellent light harvesting performance. ,, The surface roughness of the graphene/SiNHs was characterized by AFM (Figure d). It is clear that the conformal graphene/SiNHs is extremely rough, and the root-mean-square roughness ( R rms ) reaches 127 nm, which is also beneficial for reducing reflection and trapping more light.…”

Section: Resultsmentioning

confidence: 99%

Light Trapping in Conformal Graphene/Silicon Nanoholes for High-Performance Photodetectors

Yang

Tang

Luo

et al. 2019

ACS Appl. Mater. Interfaces

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Hybrid graphene/silicon heterojunctions have been widely utilized in photodetectors because of their unique characteristics of high sensitivity, fast response, and CMOS compatibility. However, the photoresponse is restricted by the high reflectance of planar silicon (up to 50%). Herein, an improved graphene/Si detector with excellent light absorption performance is proposed and demonstrated by directly growing graphene on the surface of silicon nanoholes (SiNHs). It is shown that the combination of SiNHs with conformal graphene provides superior interfaces for efficient light trapping and transport of the photoexcited carriers. A high absorption of up to 90% was achieved, and the conformal graphene/SiNH-based photodetectors exhibited a higher photoresponsivity (2720 A/W) and faster response (∼6.2 μs), compared with the counterpart of the planar graphene/Si, for which the corresponding values are 850 A/W and 51.3 μs. These results showcase the vital role of the material morphology in optoelectronic conversion and pave the way to explore novel high-performance heterojunction photodetectors.

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Section: Resultsmentioning

confidence: 99%

Light Trapping in Conformal Graphene/Silicon Nanoholes for High-Performance Photodetectors

Yang

Tang

Luo

et al. 2019

ACS Appl. Mater. Interfaces

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“…[76] Hence, an enhanced light harvesting or a high light absorption can be achieved as these SiNHs exhibit an inverted taper shape. [77][78][79] The reflectance of these SiNHs was found to be only 10−15% in the wavelength range of 400−800 nm as compared to 35−55% for planar-Si. Moreover, the reflectance of the conformal graphene/SiNHs heterostructure was found to be further reduced below 10% due to the additional absorption through graphene.…”

Section: Fabrication Of Cvd-graphene/textured-si Heterostructures For Photodetectorsmentioning

confidence: 99%

CVD Graphene on Textured Silicon: An Emerging Technologically Versatile Heterostructure for Energy and Detection Applications

Khan

Kumar

Cong

et al. 2021

Adv Materials Inter

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Integration of chemical vapor deposited (CVD) graphene with textured‐Si substrates is an emerging research area wide open. Graphene can serve as both a transparent top electrode and a charge‐separating/transport‐active layer. However, its low light absorption capability, and high reflectance of planar‐Si substrate are major concerns for light harvesting required for photovoltaic devices especially solar cells and photodetectors (PDs). Therefore, CVD‐graphene/textured‐Si heterostructure effectively addresses this problem as the textured‐Si provides more surface area for light harvesting by suppressing light reflection and enables the efficient charge separation/transport as well. Recently, CVD‐graphene/textured‐Si Schottky junction based high performance solar cells and PDs have successfully been demonstrated. Moreover, the graphene coating on textured‐Si enhances the conductivity of Si anodes and provides structural stability for lithium‐ion batteries (LIBs). Furthermore, the optoelectronic coupled interfacial properties in such heterostructures suitably construct the platforms for surface enhanced Raman scattering (SERS) based detection and photocathodes for H2‐production, respectively. Hence, in this review, the fabrication of various CVD‐graphene/textured‐Si heterostructures and their applications in solar cells, PDs, SERS, LIBs, and H2‐production are critically analyzed with respect to the synergistic effect of Si‐texturing, electronic/optoelectronic properties of CVD‐graphene, etc. Finally, conclusions and outlook of this rapidly emerging and technologically broad research area are presented.

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“…Due to numerous applications [12] trapping, focusing, and concentration of light at the nanoscale have recently emerged as topics of great interest primarily in regard to various plasmonic devices [13][14][15][16][17][18][19] and photonic band-gap structures [20][21][22][23]. Another promising directions of research is all-dielectric nanophotonics [24,25] which employs subwavelength dielectric objects, such as e.g.…”

Section: Introductionmentioning

confidence: 99%

Light enhancement by quasi-bound states in the continuum in dielectric arrays

Bulgakov¹,

Максимов²

2017

Opt. Express

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The article reports on light enhancement by structural resonances in linear periodic arrays of identical dielectric elements. As the basic elements both subwavelength spheres and rods with circular cross section have been considered. In either case it has been demonstrated numerically that high-Q structural resonant modes originated from bound states in the continuum enable near-field amplitude enhancement by factor of 10-25 in the red-to-near infrared range in lossy silicon. The asymptotic behavior of the Q-factor with the number of elements in the array is explained theoretically by analyzing quasi-bound states propagation bands.

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Efficient light trapping in tapered silicon nanohole arrays

Cited by 14 publications

References 24 publications

Light Trapping in Conformal Graphene/Silicon Nanoholes for High-Performance Photodetectors

Light Trapping in Conformal Graphene/Silicon Nanoholes for High-Performance Photodetectors

CVD Graphene on Textured Silicon: An Emerging Technologically Versatile Heterostructure for Energy and Detection Applications

Light enhancement by quasi-bound states in the continuum in dielectric arrays

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