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Schulze, Hans-Joachim; Öfner, Helmut; Niedernostheide, Franz-Josef; Lükermann, Florian; Schulz, Andreas
Physica status solidi. A, Applications and materials science, September 2019, 2019-09-00, Letnik: 216, Številka: 17Journal Article
The use of silicon wafer substrates with a diameter of 300 mm for the manufacturing of electronic devices strongly increases the overall productivity of a device manufacturing line. However, float‐zone (FZ) silicon, which is traditionally used for insulated gate bipolar transistors (IGBTs), is not available for wafer diameters exceeding 200 mm. Therefore, a silicon material fabricated by the magnetic Czochralski (m:Cz) method has to be used for IGBT production on 300 mm wafers. Critical issues of this material are the so‐called crystal originated particles (COPs) and the strong axial variation of the doping level along the crystal. Furthermore, the m:Cz material contains a relatively high concentration of oxygen so that the influence of carbon/oxygen complexes has to be considered. CIOI complexes can be decorated with hydrogen atoms, resulting in donor‐like complexes. In particular, the application of proton irradiation for the doping of the field‐stop zone results in a relatively high concentration of interstitial carbon, which is continuatively associated with the generation of undesired donors. It is shown that the electrical behavior of IGBTs fabricated on FZ substrates can be well reproduced using the m:Cz material if the parameters of the hydrogen implantation are adjusted appropriately. The use of 300 mm silicon wafers strongly increases the productivity of a manufacturing line for insulated gate bipolar transistors. However, 300 mm float‐zone silicon is not available, so that the Czochralski material is required. For this, several critical issues have to be solved: crystal originated particles, the axial‐doping variation along the crystal, and the minimization of the concentration of CIOIH complexes.
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