United Microelectronics Corp.

United Silicon Incorporated

Tse-Wei Liu

Cheng-Chieh Huang

Tang Yu

Li-Wu Tsao

Eddie Chen

Weichi Ting

Tzung-Hua Ying

Jumn-Min Fan

A silicon oxide layer is formed on a semiconductor wafer by performing a high temperature oxidation (HTO) process using dichlorosilane (SiH Cl ) and nitrous oxide (N O), as reacting gases, having a flow rates with a ratio greater than 2:1, respectively. The reacting moles of dichlorosilane to nitrous oxide are in the proportion of 1:2.

Method of forming a silicon oxide layer

A method of increasing the selectivity of silicon nitride deposition. A substrate is provided. A silicon oxide layer is formed over a portion of the substrate. Ammonia NH is passed over the silicon oxide layer and the substrate surface for a definite period to perform a surface treatment. Silicon nitride is subsequently deposited over the substrate and the silicon oxide layer.

Method of increasing selectivity in silicon nitride deposition

The present invention provides a method of fabricating capacitor dielectric layer. A bottom electrode covered by a native oxide layer on a chip is provided. The chip is disposed into a low pressure furnace. A mixture of dichlorosilane and ammonia is introduced into the low pressure furnace to form a nitride layer on the native oxide layer. In the same low pressure furnace, nitrogen monoxide or nitric oxygen is infused to form an oxynitride layer on the nitride layer.

Method of fabricating capacitor dielectric

A method for cleaning a semiconductor wafer which includes the sequential steps of cleaning the wafer in a dilute hydrofluoric acid bath, cleaning the wafer in a first ozone bath, cleaning the wafer in a dilute hydrofluoric acid/hydrogen peroxide/hydrogen chloride bath, followed by cleaning the wafer in a second ozone bath. The method uses the dilute hydrofluoric acid/hydrogen peroxide/hydrochloric acid bath instead of the conventional DHF bath and RCA2 bath. Hence, the amount of chemicals consumed and the number of baths used by the cleaning station are lowered. In addition, ozone is passed into an overflow loath so that the highly reactive ozone can be utilized to clean the wafer without putting additional load on the cleaning station. Therefore, the cleaning operation can be carried out in a smaller cleaning station using somewhat lower temperature and lower concentration chemical solutions. The efficiency is as high as a multi-bath station, but chemicals are not wasted. Furthermore, the throughput is high and stable without causing too many safety and environmental problems.

Method for cleaning a semiconductor wafer

A method of water mark inspection. By forming a pattern on a test wafer, the water mark formed thereon directly reflects the features of a wafer product to be evaluated. The water mark is formed by simulating fabrication process conditions of forming the wafer product of which the performance is to be evaluated. Thus, after scanning the water mark by a defect inspection machine, the performance of the wafer product is evaluated.

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Hsinchu, Taiwan

Tse-Wei Liu