Fabrication of high-performance ordered radial junction silicon nanopencil solar cells by fine-tuning surface carrier recombination and structure morphology

Chen, Junyi; Subramani, Thiyagu; Jevasuwan, Wipakorn; Dai, Kotaro; Shinotsuka, Kei; Hatta, Y.; Fukata, Naoki

doi:10.1016/j.nanoen.2018.12.002

Cited by 13 publications

(6 citation statements)

References 41 publications

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“…, microstructures with tapered conical spikes [3]- [5], high aspect ratio nanoscale needles, vertical pores, or columns [6], inverted submicron structures [7]- [9], and highly ordered arrays of nanorods, cones [10], and pencils [10]- [12], as well as micropillars and micropencils [13]. B-Si nanotextures are of particular interest for photovoltaic applications because of their low reflectance and enhanced optical absorption, which could enable higher solar cell efficiencies.…”

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confidence: 99%

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

Scardera

Wang

Khan

et al. 2021

IEEE J. Photovoltaics

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The integration of nanotextured black silicon (B-Si) into solar cells is often complicated by its enhanced phosphorus doping effect, which is typically attributed to increased surface area. In this article, we show that B-Si's surface-to-volume ratio, or specific surface area (SSA), which is directly related to surface reactivity, is a better indicator of reduced sheet resistance. We investigate six B-Si conditions with varying dimensions based on two morphology types prepared using metal-catalyzed chemical etching and reactive-ion etching. We demonstrate that for a POCl 3 diffusion, B-Si sheet resistance decreases with increasing SSA, regardless of surface area. 2-D dopant contrast imaging of different textures with similar surface areas also indicates that the extent of doping is enhanced with increasing SSA. 3-D diffusion simulations of nanocones show that both the extent of radial doping within a texture feature and the metallurgical junction depth in the underlying substrate increase with increasing SSA. We suggest SSA should be considered more readily when studying B-Si and its integration into solar cells. Index Terms-Black silicon, phosphorus doping, silicon nanotexture, surface area, surface-to-volume ratio. I. INTRODUCTIONN ANOTEXTURED silicon often falls under the collective label of black silicon (B-Si) which typically describes surfaces with low reflectance across a wide wavelength range (ultraviolet to near-infrared) and which appear black to the eye. B-Si can be prepared using a myriad of techniques and covers a wide range of surface morphologies and feature dimensions (from nano to micron-scale), including nanoporous layers [1],

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confidence: 99%

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

Scardera

Wang

Khan

et al. 2021

IEEE J. Photovoltaics

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“…Silicon nanotips were prepared by metal-catalyzed electroless etching (MCEE), followed by chemical polishing etching (CPE). 11,35 Panels a−c of Figure 2 show scanning electron microscopic (SEM) images that illustrate the morphology of modified silicon nanotips and the coating of conducting organic materials. The silicon nanoholes are directly fabricated using Figure 2a is a SEM image of the silicon nanotips.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The structure of hybrid solar cells is schematically illustrated in Figure c. Silicon nanotips were prepared by metal-catalyzed electroless etching (MCEE), followed by chemical polishing etching (CPE). , …”

Section: Results and Discussionmentioning

confidence: 99%

Highly Air-Stable Solution-Processed and Low-Temperature Organic/Inorganic Nanostructure Hybrid Solar Cells

Subramani

Chen

Kobayashi

et al. 2019

ACS Appl. Energy Mater.

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Silicon nanostructure-based hybrid solar cells have attracted much attention due to their potential advantages of extremely simple device fabrication and the cost-effectiveness of their hybrid structure. These hybrid solar cells open a new research direction in new-generation photovoltaics. However, the performance of hybrid inorganic/organic solar cells tends to deteriorate because of severe problems with long-term stability. These will need to be solved before hybrid solar cells can be used successfully to harvest solar energy. To solve this issue, we describe a new high-performance hybrid Sinanotip/TEDs (zwitterionic tetrathiafulvalene-extended dicarboxylate radicals) solar cell that shows long-term stability. TED is composed of the only singlecomponent molecule without any doping, thus providing long-lasting chemical stability combined with high conductivity. These Si-nanotips/TED hybrid solar cells are markedly more stable than Si/PEDOT:PSS hybrid solar cells, which, unless encapsulated, rapidly degrade under ambient conditions. This new TED material opens a pathway toward a new generation of organic electronics and optoelectronics devices.

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“…can be used to assist the electrolysis of Si in hydrofluoric acid (HF) solution . Considerable efforts have been made to optimize the desired nanostructures, such as nanowires, nanopillars, nanopencils, and others. − Si nanohole structures that reflect less than 5% of incident light have been reported by our group by using two-step etching . Si nanowires (Si NWs) were also fabricated by one-step etching followed by treatment with tetramethylammonium hydroxide to reduce surface defects on NWs .…”

Section: Introductionmentioning

confidence: 99%

Spectral Downshifting and Passivation Effects Using 2D Perovskite (OAm)₂SnBr₄ Films to Enhance the Properties of Si Nanowire Solar Cells

Abdelbar

Zhang

Abdelhameed

et al. 2023

ACS Appl. Energy Mater.

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Si nanowires (Si NWs) are emerging as a promising candidate for photovoltaics due to their significant light-trapping characteristics. However, Si NWs have a high density of surface traps, which lead to carrier recombination; also, thermalization due to the absorption of high-energy photons causes the dissipation of input solar energy. In this study, Ag/Ti/n+/p-Si NWs/MoO x /Ag solar cells were formed based on Si NWs with MoO x as a hole transport layer. A highly luminescent 2D perovskite (C18H35NH3)2SnBr4 was applied to the front surface of the cell. This 2D perovskite with oleylamine (OAm) spacer passivates the surface of the Si NWs. In addition to the passivation effect, the 2D perovskite (OAm)2SnBr4 causes a downshifting and energy-transfer effect, which reduces the heat loss and raises the conversion efficiency. This effect has often been observed in semiconductor quantum dots and is also evident in 2D perovskite films, resulting in improved J sc, V oc, and fill factor and an increase in the overall cell efficiency to 18%.

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Fabrication of high-performance ordered radial junction silicon nanopencil solar cells by fine-tuning surface carrier recombination and structure morphology

Cited by 13 publications

References 41 publications

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

Highly Air-Stable Solution-Processed and Low-Temperature Organic/Inorganic Nanostructure Hybrid Solar Cells

Spectral Downshifting and Passivation Effects Using 2D Perovskite (OAm)₂SnBr₄ Films to Enhance the Properties of Si Nanowire Solar Cells

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Fabrication of high-performance ordered radial junction silicon nanopencil solar cells by fine-tuning surface carrier recombination and structure morphology

Cited by 13 publications

References 41 publications

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

On the Enhanced Phosphorus Doping of Nanotextured Black Silicon

Highly Air-Stable Solution-Processed and Low-Temperature Organic/Inorganic Nanostructure Hybrid Solar Cells

Spectral Downshifting and Passivation Effects Using 2D Perovskite (OAm)2SnBr4 Films to Enhance the Properties of Si Nanowire Solar Cells

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Spectral Downshifting and Passivation Effects Using 2D Perovskite (OAm)₂SnBr₄ Films to Enhance the Properties of Si Nanowire Solar Cells