Resources Contact Us Home
Method for enhancing electrode surface area in DRAM cell capacitors

Image Number 7 for United States Patent #7573121.

Methods for forming the lower electrode of a capacitor in a semiconductor circuit, and the capacitors formed by such methods are provided. The lower electrode is fabricated by forming a texturizing underlayer and then depositing a conductive material thereover. In one embodiment of a method of forming the lower electrode, the texturizing layer is formed by depositing a polymeric material comprising a hydrocarbon block and a silicon-containing block, over the insulative layer of a container, and then subsequently converting the polymeric film to relief or porous nanostructures by exposure to UV radiation and ozone, resulting in a textured porous or relief silicon oxycarbide film. A conductive material is then deposited over the texturizing layer resulting in a lower electrode have an upper roughened surface. In another embodiment of a method of forming the lower electrode, the texturizing underlayer is formed by depositing overlying first and second conductive metal layers and annealing the metal layers to form surface dislocations, preferably structured as a periodic network. A conductive metal is then deposited in gaseous phase, and agglomerates onto the surface dislocations of the texturizing layer, forming nanostructures in the form of island clusters. The capacitor is completed by depositing a dielectric layer over the formed lower electrode, and forming an upper capacitor electrode over the dielectric layer. The capacitors are particularly useful in fabricating DRAM cells.

  Recently Added Patents
Communication terminal device, communication system, and communication control method
Methods and compositions for improving photodynamic therapy through administration of lipids
Fuel cell support structure
Active constant power supply apparatus
Actuators and moveable elements with position sensing
PEGylated, extended insulins
Lithographic apparatus and device manufacturing method
  Randomly Featured Patents
Nd-YAG laser
Flow control method for decontaminating radioactively contaminated nuclear steam generator
Rechargeable hand held vacuum cleaner with electrical connections circuit board with spring contacts
Solid state color imager with on-chip color balance
Process for reducing iron in phosphoric acid solution
Machine tool
Double acting cylinder with integral end position volume chambers
Non-contact shape meter for flatness measurements
Gain monitoring method for optical amplifier and apparatus thereof
Semiconductor memory device and timing control method