Formation of Si thin films by electrodeposition in ionic liquids for solar cell applications

Tsuyuki, Yasuhiro; Takai, Hidenori; Fukunaka, Yasuhiro; Homma, Takayuki

doi:10.7567/jjap.57.08rb11

Cited by 12 publications

(8 citation statements)

References 47 publications

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“…Owing to its favorable physical properties, this material is an indispensable component for solar energy conversion and electronic industry. The possibility to form reversible Si–Li alloys and to boost the energy density of the next-generation rechargeable batteries provides a new important perspective for the development of advanced energy storage. − However, the industrial production of pure silicon is highly energy-consuming since the chemical reduction of SiO 2 , which is involved in this process, is performed at 2000 °C. Furthermore, depending on its application, refining of the metallurgical silicon is afterward necessary .…”

Section: Introductionmentioning

confidence: 99%

“…Since the first report on this topic, silicon electrodeposition at room temperature has been performed in different electrolytes, involving as a solvent propylene carbonate (PC), ,− dichloromethane, acetonitrile, ,, tetrahydrofuran, ,,, and a few types of different ILs. ,,,− However, the obtained Si layers contain large amounts of decomposition products of the corresponding electrolytes. ,,, Additionally, the high volatility and flammability of the conventional organic solvents are serious disadvantages when applied in electrolytes. In contrast, ILs do not share the latter problems and, moreover, they offer a large electrochemical window of stability, which enables their safe and effective application .…”

Section: Introductionmentioning

confidence: 99%

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Electrogravimetry and Structural Properties of Thin Silicon Layers Deposited in Sulfolane and Ionic Liquid Electrolytes

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Dimitrova

Krischok

et al. 2020

ACS Appl. Mater. Interfaces

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Potentiostatic deposition of silicon is performed in sulfolane (SL) and ionic liquid (IL) electrolytes. Electrochemical quartz crystal microbalance with damping monitoring (EQCM-D) is used as main analytical tool for the characterization of the reduction process. The apparent molar mass (M app ) is applied for in situ estimation of the layer contamination. By means of this approach, appropriate electrolyte composition and substrate type are selected to optimize the structural properties of the layers. The application of SL electrolyte results in silicon deposition with higher efficiency compared to the IL 1-butyl-1methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, [BMP][TFSI]. This has been associated with the instability of the IL in the presence of silicon tetrachloride and the enhanced incorporation of IL decomposition products into the growing silicon deposit. X-ray photoelectron spectroscopy (XPS) analysis supports the results about the layer composition, as suggested from the microgravimetric experiments. Attention has been given to the impact of practically relevant substrates (i.e., Cu, Ni, and vitreous carbon) on the reduction process. An effective deposition can be carried out on the metal electrodes in both electrolytes due to accelerated reaction kinetics for these types of substrates. However, on vitreous carbon (VC), a successful reduction of SiCl 4 can only be accomplished in the IL, while the electroreduction process in SL is dominated by the decomposition of the electrolyte. For short deposition times, the scanning electron microscopy (SEM) images display rough morphologies in the nanometer range, which evolve further to structures with increased length scale of the surface roughness. The development of a rough interface during deposition, resulting in QCM damping at advanced stages of the process, is interpreted by a model accounting for the resistive force caused by the interaction of the liquid with a nonuniform layer interface. By using this approach, the individual contributions of the surface roughness and viscoelastic effects to the measured damping values are estimated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrogravimetry and Structural Properties of Thin Silicon Layers Deposited in Sulfolane and Ionic Liquid Electrolytes

Link

Dimitrova

Krischok

et al. 2020

ACS Appl. Mater. Interfaces

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“…A relevant example is the deposition from ionic liquids (ILs) – room temperature molten salts. As will be discussed in section , only very thin Si layers were deposited from ILs due to insulating properties of the deposits at room temperature. − …”

Section: Voltammetry and Basic Reactions Of Silicon As An Electrode I...mentioning

confidence: 99%

“…Recently, an innovative approach was proposed by Tsuyuki et al, which is based on the formation of Si thin films in ILs under light irradiation conditions . The process has been studied in N -trimethyl- N -hexylammonium bis(trifluoromethanesulfonyl)imide (TMHA-TFSI) as an ionic liquid and SiCl 4 as a Si source.…”

Section: Thin Si Filmsmentioning

confidence: 99%

“…Recently, an innovative approach was proposed by Tsuyuki et al, which is based on the formation of Si thin films in ILs under light irradiation conditions. 19 The process has been No Si deposit was obtained using ethyl alcohol as a solvent and SiF 4 as a precursor. 72 A mixture of silicon, carbon, and fluorine was deposited from K 2 SiF 6 dissolved in acetone with the addition of HF.…”

Section: Electrodeposition Of Si From Ionic Liquids and Organic Solventsmentioning

confidence: 99%

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Silicon Electrochemistry in Molten Salts

Juzeliūnas

Fray

2019

Chem. Rev.

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Silicon electrochemistry has the potential to advance sustainable energy solutions by offering environmentally friendly and secure technologies that can contribute to the low-carbon economy. Electrochemical methods use electrons directly as reducing agents, eliminating the need for harmful chemicals and offering simpler, one-step, process control. Silicon itself is the second most abundant element in the earth's crust, is nontoxic, and is a robust material offering high efficiencies in solar photovoltaics. As such, silicon currently dominates the solar energy market and could continue to do so for the next few decades. This review summarizes recent achievements in the molten salt electrochemistry of silicon, highlighting subjects of technological significance such as the production of silicon by silica electro-deoxidation, the formation of photoactive layers, silicon electrorefining, and the synthesis of semiconductors as well as nanostructures for energy storage applications. The review highlights future opportunities and challenges such as the production of highly pure silicon, the creation of carbon-free anodes for oxygen production, and silicon electrodeposition from gaseous precursors.

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Silicon Electrowinning and Electrodeposition of Thin Layers

2022

Silicon

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Formation of Si thin films by electrodeposition in ionic liquids for solar cell applications

Cited by 12 publications

References 47 publications

Electrogravimetry and Structural Properties of Thin Silicon Layers Deposited in Sulfolane and Ionic Liquid Electrolytes

Electrogravimetry and Structural Properties of Thin Silicon Layers Deposited in Sulfolane and Ionic Liquid Electrolytes

Silicon Electrochemistry in Molten Salts

Silicon Electrowinning and Electrodeposition of Thin Layers

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