Journal ArticleDOI
Determining the material structure of microcrystalline silicon from Raman spectra
C Chiel Smit,van Racmm René Swaaij,H Donker,A.M.H.N. Petit,Wmm Erwin Kessels,van de Mcm Richard Sanden +5 more
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TLDR
In this article, an easy and reliable method to extract the crystalline fractions in microcrystalline films is proposed, in a natural way, the inconsistencies that arise from the regular peak fitting routines.Abstract:
An easy and reliable method to extract the crystalline fractions in microcrystalline films is proposed. The method is shown to overcome, in a natural way, the inconsistencies that arise from the regular peak fitting routines. We subtract a scaled Raman spectrum that was obtained from an amorphous silicon film from the Raman spectrum of the microcrystalline silicon film. This subtraction leaves us with the Raman spectrum of the crystalline part of the microcrystalline film and the crystalline fraction can be determined. We apply this method to a series of samples covering the transition regime from amorphous to microcrystalline silicon. The crystalline fractions show good agreement with x-ray diffraction (XRD) results, in contrast to crystalline fractions obtained by the fitting of Gaussian line profiles applied to the same Raman spectra. The spectral line shape of the crystalline contribution to the Raman spectrum shows a clear asymmetry, an observation in agreement with model calculations reported previo...read more
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Aligned Carbon Nanotube‐Silicon Sheets: A Novel Nano‐architecture for Flexible Lithium Ion Battery Electrodes
Kun Fu,Ozkan Yildiz,Hardik Bhanushali,Yongxin Wang,Kelly L. Stano,Leigang Xue,Xiangwu Zhang,Philip D. Bradford +7 more
TL;DR: Aligned carbon nanotube sheets provide an engineered scaffold for the deposition of a silicon active material for lithium ion battery anodes, allowing uniform deposition of silicon thin films while the alignment allows unconstrained volumetric expansion of the silicon, facilitating stable cycling performance.
Journal ArticleDOI
Impact of front and rear texture of thin-film microcrystalline silicon solar cells on their light trapping properties
TL;DR: In this paper, the effect of front and rear texture of thin-film microcrystalline silicon solar cells on light trapping was evaluated by characterizing solar cell specimens with both superstrate ( p - i - n ) and substrate ( n - i- p ) configurations that have a variety of surface morphologies including intentionally polished flat surfaces.
Journal ArticleDOI
Amorphous, nanocrystalline and crystalline calcium carbonates in biological materials
TL;DR: Raman spectroscopy has been applied to cultured pearls from freshwater (genus Hyriopsis) and marine bivalve species (Pinctada maxima) as well as to shells of Diplodon chilensis patagonicus bivalves as mentioned in this paper.
Journal Article
The one phonon raman spectrum in microcrystalline silicon
H. Richter,Z. P. Wang,Lothar Ley +2 more
TL;DR: In this paper, a relaxation in the q-vector selection rule for the excitation of the Raman active optical phonons was proposed to increase the red shift and broadening of the signal from microcrystalline silicon films.
Journal ArticleDOI
High-rate deposition of microcrystalline silicon p-i-n solar cells in the high pressure depletion regime
TL;DR: In this paper, the presence of hydrogenated crystalline grain boundaries can be detected via the crystalline surface hydrides contribution to the narrow high stretching modes by infrared transmission spectroscopy.
References
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Journal ArticleDOI
The one phonon Raman spectrum in microcrystalline silicon
H. Richter,Z. P. Wang,Lothar Ley +2 more
TL;DR: In this paper, a relaxation in the q-vector selection rule for the excitation of the Raman active optical phonons was proposed to increase the red shift and broadening of the signal from microcrystalline silicon films.
Journal ArticleDOI
The effects of microcrystal size and shape on the one phonon Raman spectra of crystalline semiconductors
TL;DR: In this article, the effect of the exact shape of the microcrystal and the relationship between the width, shift and asymmetry of the Raman line is calculated and is in good agreement with available experimental data.
Journal ArticleDOI
Raman scattering from hydrogenated microcrystalline and amorphous silicon
Z Iqbal,Stan Veprek +1 more
TL;DR: In this paper, Raman scattering measurements on hydrogenated microcrystalline silicon prepared in a hydrogen plasma at deposition temperatures between approximately 65 and 400 degrees C are presented and discussed.
Journal ArticleDOI
Effect of grain boundaries on the Raman spectra, optical absorption, and elastic light scattering in nanometer-sized crystalline silicon
TL;DR: It is suggested that the enhancement of the scattering cross section, which scales with the observed optical-absorption coefficient and diffuse elastic light scattering, is due to enhanced coupling of the electromagnetic field of the incident light to the charge-density fluctuations at the grain boundaries of the quasi-isolated crystallites.