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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation |
Document Type: | Computer File |
All Authors / Contributors: |
Laurianne Pichon-Balmadier; Pierre Ranson; Université d'Orléans.; Ecole doctorale Sciences et technologies (Orléans).; Groupe de recherches sur l'énergétique des milieux ionisés. UMR 6606 (Orléans / 1996-2011). |
OCLC Number: | 758907412 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Laurianne Pichon-Balmadier ; sous la direction de Pierre Ranson. |
Abstract:
Silicon deep etching is part of microsystems and power microelectronic devices manufacture process.Nowadays, two main processes (Bosch and cryogenic) are used to pattern silicon at a micrometric scale.This work focuses on the study and the optimisation of a process for deep silicon etching, named STiGerprocess. The latter consist in alternating etching and passivation plasmas, as for the Bosch process. Italso comprise a cryogenic process like plasma chemistry, since a SiOxFy passivation film is deposited by aSiF4/02 plasma, the silicon substrate being cooled down to cryogenic temperatures. This work includesthe characterisation of the passivation film, in order to efficiently and rapidly develop STiGer etchingprocesses. The SiOxFy film deposited by SiF4/02 plasma has been characterized by in situ FTIR, by insitu spectroscopic ellipsometry as weil as by experiments, that allowed to evaluate the passivation filmresistance to a SF6 etching plasma. The SiOxFy film growth is enhanced by the presence of 0 and SiOFxradicals in the plasma, when the substrate temperature is less than -80°(. Moreover, the film resistanceto an etching plasma may be due to its thickness. The SiOxFy film grown by a SF6/02 plasma has beencharacterised by in situ XPS in collaboration with IMN. When the substrate is heated up to ambienttemperature, the oxygen containing components desorb first at a temperature of approximately -90°(.Secondly, the desorption of the SiF4 molecule is caused by a rearrangement of the atoms at the surface.Finally, STiGer process has been optimized for two applications: etching of submicronic trenches for 3Dcapacitance production and through wafer etching for interconnexion.
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