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Film materials capacitor dielectrics

Since the early suggestion that ferroelectric thin film materials could be the high dielectric layer in the capacitor of the ultra large scale integrated dynamic random access memory devices (ULSI DRAMS) made by Parker and Tasch, there has been a great deal of research effort to deposit multi-component ferroelectric oxide thin films as well as more recent industrial activity. The term ferroelectric indicates the property of certain materials that have remnant... [Pg.205]

Before the metal-organic CVD (MOCVD) process of the BST film is discussed, the reasons for using the CVD process, despite its difficulties should be described. The storage node size of the capacitors in the current state-of-the-art DRAMs is about 0.15 x 0.35 x 1.0 pm with minimum spacing of about 0.15 pm between the nodes when the dielectric layer is a SiO/SijN bi-layer or Ta O, and the electrode materials are poly-Si. Here 1 pm is the height of the nodes. Even smaller lateral dimensions are expected when DRAMs use a BST thin film as the capacitor dielectric layer. Even though the BST films have a much smaller t value, which... [Pg.206]

Both AC and DC PDFs have been used to produce fuU-color, flat-panel large area dot-matrix devices. PDP systems operate in a memory mode. Memory operation is achieved through the use of a thick-fihn current-limiting series capacitor at each cell site. The internal cell memory capability eliminates the need for a refresh scan. The cell memory holds an image until it is erased. This eliminates flicker because each cell operates at a duty cycle of one. The series cell capacitor in an AC-PDP is fabricated using a thick-film screen-printed dielectric glass, as illustrated in Fig. 7.41. The gap separation between the two substrates is typically 4 mil. The surface of the thick-fihn dielectric is coated with a thin-film dielectric material such as magnesium oxide. [Pg.574]

Polyvinylidene fluoride, is a fluorinated semi-crystalline thermoplastic which has a continuous use service temperature of up to 150 °C and a very low dielectric constant. Current manufacturers include Arkema which has become legally separated from its former owner. Total. PVDF applications include its use as fuel cell membrane material, film material in capacitors and as electrolyte material in sodium sulfur batteries. In the US, NASA has employed a crosslinked polystyrene sulfonic acid (PSSA)/PVDF composite as a PEM. [Pg.21]

Early capacitors were usually made with paper or mica. Paper was used for large capacitance values and mica was used for high-frequency capacitors. With the advent of commercial polymer film production, these increasingly available materials became popular as capacitor dielectrics. Polymer films are ideally suited for capacitor manufacture because they ... [Pg.333]

Many polymer films have been examined as capacitor dielectrics but those principally used are polyethylene terephthalate, polystyrene, polycarbonate, polytetrafluoroethylene, polyimides and polypara-xylylene. A number of these materials are more familiar by their trade names ... [Pg.333]

The properties of inorganic materials with dielectric constants less than 12 are described in this section under the headings of Ceramics, Glasses, Micas, Substrates, Glass-Ceramics, and Thick Films. Since micas and glasses are also used as dielectrics, the properties associated with capacitor applications are discussed in the section on Dielectrics. [Pg.69]

Dielectrics used to satisfy the first and the second requirements are electric insulators with relatively low dielectric constants (less than 15). Capacitor dielectrics with dielectric constants greater than 20 are used as charge storage devices. Thus, thick-film dielectric formulations can be broadly categorized as either insulator or capacitor dielectrics. Insulator dielectric materials can be further categorized as sealing glasses, crossover dielectrics, and multilayer dielectrics. [Pg.592]


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Capacitors

Capacitors dielectrics

Dielectric films

Dielectrics, thick-film capacitor materials

Film materials

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