Passivation study of multi-crystalline silicon wafer with i-a-Si:H layer deposited by HWCVD

Agarwal, M. K.; Dusane, Rajiv O.

doi:10.1016/j.tsf.2014.10.025

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…The details of the process can be found in our previously published work. 50,51 The a-Si:H film, more often referred to simply as a-Si or Si in the manuscript, was obtained by allowing SiH 4 gas (Matheson, ULSI grade) to pass through the tantalum filament (Kurt J Lesker, 0.5 mm) held at 1600 °C for a duration of 3 min 30 s. A constant flow of 20 sccm of SiH 4 gas at a pressure of 20 mTorr was maintained during the growth process.…”

Section: Methodsmentioning

confidence: 99%

Understanding the Electrolyte Chemistry Induced Enhanced Stability of Si Anodes in Li-Ion Batteries based on Physico-Chemical Changes, Impedance, and Stress Evolution during SEI Formation

Tripathi,

Yesilbas,

Lamprecht

et al. 2023

J. Electrochem. Soc.

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Volume expansion/contraction of Si-based anodes during electrochemical lithiation/delithiation cycles causes loss in mechanical integrity and accrued instability of the solid electrolyte interphase (SEI) layer, culminating into capacity fade. Electrolyte additives like fluoroethylene carbonate (FEC) improve SEI stability, but the associated causes remain under debate. This work reveals some of the roles of FEC via post-mortem observations/analyses, operando stress measurements, and a comprehensive study of the impedance associated with the formation/evolution of SEI during lithiation/delithiation. Usage of 10 vol.% FEC as electrolyte additive leads to significant improvements in cyclic stability and Coulombic efficiency and facilitates smoother/compact/crack-free surface/SEI, in contrast to the cracked/pitted/uneven surface upon non-usage of FEC. Operando stress measurements during SEI formation reveal compressive stress development, followed by loss in mechanical integrity, upon non-usage of electrolyte additive, in contrast to insignificant stress development associated with SEI formation upon usage of FEC. The proposed electrochemical impedance spectroscopy model facilitates good fit with the impedance data at all states-of-charge, with the SEI resistance and capacitance exhibiting expected variations with cycling and the SEI resistance progressively decreasing with cycle number in the presence of FEC. By contrast, in the absence of FEC, severe fluctuations observed with the SEI resistance and capacitance indicate instability.

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Section: Methodsmentioning

confidence: 99%

Understanding the Electrolyte Chemistry Induced Enhanced Stability of Si Anodes in Li-Ion Batteries based on Physico-Chemical Changes, Impedance, and Stress Evolution during SEI Formation

Tripathi,

Yesilbas,

Lamprecht

et al. 2023

J. Electrochem. Soc.

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Implanted dual‐band circular antenna for biomedical applications

Mohamed

Sharawi

Muqaibel

2018

Micro & Optical Tech Letters

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A compact dual‐band circular patch antenna is designed for implanted biomedical data telemetry systems. Several miniaturization techniques were applied to cover dual bands. The antenna has a radius of 7.5 mm, a thickness of 1.92 mm and a total volume of 340 mm3. The antenna covers MedRadio (401–405 MHz), MICS (402–405 MHz), and ISM bands (433.2–434.8 MHz, 2.4–2.5 GHz). The −10 dB bandwidths are 346–460 MHz (114 MHz) and 2.37–2.63 GHz (260 MHz). The designed antenna was fabricated and its performance was tested inside flesh samples.

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Controlling the c-Si/a-Si:H interface in silicon heterojunction solar cells fabricated by HWCVD

et al. 2017

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Passivation study of multi-crystalline silicon wafer with i-a-Si:H layer deposited by HWCVD

Cited by 3 publications

References 9 publications

Understanding the Electrolyte Chemistry Induced Enhanced Stability of Si Anodes in Li-Ion Batteries based on Physico-Chemical Changes, Impedance, and Stress Evolution during SEI Formation

Understanding the Electrolyte Chemistry Induced Enhanced Stability of Si Anodes in Li-Ion Batteries based on Physico-Chemical Changes, Impedance, and Stress Evolution during SEI Formation

Implanted dual‐band circular antenna for biomedical applications

Controlling the c-Si/a-Si:H interface in silicon heterojunction solar cells fabricated by HWCVD

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