Structural and Chemical Investigations of Adapted Siemens Feed Rods for an Optimized Float Zone Process

Influence of Slim Rod Material Properties to the Siemens Feed Rod and the Float Zone Process

“…3 top). In the latter case, no oxide layer was observed, as published in [2]. The grain growth of the first layers of deposited silicon in the Siemens process becomes visible at the Siemens rod cross sections as a contrast region in the secondary electron image from the SEM analysis (see fig.…”

“…3). For the round shaped slim rods either epitaxial growth behavior (up to ~65 µm) can be observed for the first deposited silicon grains [2] or the directly growth of small silicon grains for a thickness of about 10-20 µm (see fig. 3 top).…”

“…To optimize process steps for the material production of photovoltaic applications, limiting influence factors have to be identified [2]. In order to get suitable float zone feed silicon, the commonly used Siemens feed rods need to be of high purity of <1 ppb [3].…”

“…FT-IR measurements of recrystallized drilled cores of different positions from a Siemens rod produced with float zone optimized deposition rate[2]. The drilled cores includes different quantities of circular slim rod material FT-IR analyses of the recrystallized drilled cores each on a top and a bottom sample positions are performed.…”

Diffusion and mass transfer of boron in molten silicon during slag refining process of metallurgical grade silicon

“…The solar-grade polysilicon used as solar cell materials is mainly produced by the chemical methods including the Siemens process and the Fluidized Bed Reactor [1][2][3]. As a result of some disadvantages such as high cost and heavy environmental pollution, the chemical route is being substituted by some other techniques [4,5].…”