Abstract:
The invention relates to a novel method for production of a memory capacitor, embodied as a trench or laminar condenser and is used, in particular, in a DRAM memory cell. Said method comprises the following steps: a lower metallic condenser electrode (13), a storage dielectric (14) and an upper condenser electrode (15) are formed, whereby the lower metallic condenser electrode (13) is formed in a self-justified manner on a silicon base material (1), then a free silicon region is formed in those positions where the lower condenser electrode is to be formed and then metal silicide (13) is formed selectively on the free silicon.
Abstract:
The invention relates to a trench condenser for use in a DRAM memory cell and a method for production of said trench condenser. Said trench condenser comprises a lower condenser electrode (10), a memory dielectric (12) and an upper condenser electrode (18), at least partly arranged in a trench (5), whereby the lower condenser electrode (10) lies adjacent to a wall of the trench in the lower region of the trench, whilst in the upper region of the trench, a spacer layer (9), made from an insulating material, is provided adjacent to the wall of the trench. The upper electrode (18) comprises at least two layers (13, 14, 15), of which at least one is metallic, with the proviso that the upper electrode does not comprise two layers of which the lower is tungsten silicide and the upper doped polymeric silicon, whereby the layers (13, 14, 15) of the upper electrode run along the walls and the floor of the trench (5) at least as far as the upper edge of the spacer layer.
Abstract:
Es wird ein Halbleiterbaustein beschrieben, der im wesentlichen aus einem Siliziummaterial aufgebaut ist und eine Isolationsschicht beispielsweise in Form einer Gate-Isolationsschicht für einen MOS-Transistor oder in Form einer Isolationsschicht einer Speicherzelle für einen dynamischen Speicherbaustein aufweist. Die Isolationsschicht besteht vorzugsweise aus einem dielektrischen Material, dessen Bandlücke grösser als die Bandlücke von SiO2 ist. Zum Aufbau der Isolationsschicht werden Materialien verwendet, die eine Metall-Fluorverbindung wie z.B. Lithiumfluorid aufweisen. Durch das beschriebene Material werden besonders dünne Isolationsschichten bereit gestellt.
Abstract:
The invention relates to a method for the production of a capacitor electrode (11) with a barrier structure (14.1) arranged beneath it. Said method comprises producing the barrier structure (14.1) by means of introducing a barrier support layer (16) and applying a CMP (chemical mechanical polishing) process.