Manuel Mencarelli
Investigation of low temperature SiGe epitaxy with high order precursors.
Rel. Matteo Cocuzza. Politecnico di Torino, Corso di laurea magistrale in Nanotechnologies For Icts (Nanotecnologie Per Le Ict), 2021
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Abstract
Since the strain technology was introduced at the 90nm node, Silicon-Germanium (SiGe) is the most widely used p-MOS Source/Drain (S/D) material. With the continuous down-scaling of transistors, the contact resistance (Rc) at the S/D-metal interface is becoming a major part of the parasitic resistance in the device. Rc depends on two factors: it is directly proportional to the contact resistivity (ρc) and inversely proportional to the contact area between electrodes and S/D. In order to decrease the Rc impact, different approaches have been studied in the last years. Complex doping engineering allows achieving ultra-low ρc, while a higher contact area can be guaranteed by implementing a wrap around contact (WAC).
An increase of germanium concentration of SiGe S/D layers driven by increasing strain in the Si channel requires a decrease of epitaxial deposition thermal budget
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