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On the material structure of hydrogenated nanocrystalline silicon Schmidt, Kathrin Jessica


The dependence of the crystalline volume fraction on the mean crystallite size, for three hydrogenated nanocrystalline silicon-based photovoltaic solar cells, is examined. For each photovoltaic solar cell considered, X-ray diffraction and Raman spectra are determined. Through the application of Scherrer's equation, the X-ray diffraction results are used in order to determine the corresponding mean crystallite sizes. Through peak decomposition, the Raman results are used in order to estimate the corresponding crystalline volume fraction. By plotting the crystalline volume fraction as a function of the mean crystallite size, it is found that larger mean crystallite sizes tend to favor reduced crystalline volume fractions. The ability to randomly pack smaller crystallites with a greater packing fraction than their larger counterparts is suggested as a possible explanation for this observation.

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