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MxP+: A new dielectric etcher with enabling technology, high productivity, and low cost‐of‐consumables

 

作者: Hongching Shan,   Evans Lee,   Michael Welch,   Bryan Pu,   James Carducci,   Kuang‐Han Ke,   Hua Gao,   Paul Luscher,   Gerard Crean,   Rynn Wang,   Richard Blume,   James Cooper,   Robert Wu,  

 

期刊: Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena  (AIP Available online 1996)
卷期: Volume 14, issue 2  

页码: 716-723

 

ISSN:1071-1023

 

年代: 1996

 

DOI:10.1116/1.588703

 

出版商: American Vacuum Society

 

关键词: INTEGRATED CIRCUITS;ETCHING;THIN FILMS;DIELECTRIC MATERIALS;SILICON COMPOUNDS;COST ESTIMATION;BPSG;TEOS

 

数据来源: AIP

 

摘要:

Dielectric etch accounts for more than half of all the dry etches used in integrated circuit (IC) fabrication, and plays a very important role in fulfilling strict requirements of volume‐manufacturing of IC circuits whose feature size is progressively decreasing. The challenge of meeting volume manufacture requirements is what MxP+ has achieved through a series of hardware and process innovations. By Pareto analysis of the wet clean time of the MxP chamber, we were able to define six major drivers to address three key issues: (1) reduce wet clean time, (2) eliminate system complexity, and (3) achieve technical excellence. Key components of the MxP+ that allow us to address them include a quartz gas distribution plate which prevents the aluminum particle formation, and the electrostatic chuck which eliminates the mechanical clamp system while reducing the particle contamination and wafer edge exclusion. The unique chamber liners of the MxP+ not only shield chamber walls, but also provided a wide process window. Process characterizations have been done for contact, via, nitride, mask open and self‐aligned contact etches, and results show that the etcher is capable of etching dielectric films of 0.35 μm features of either high or low aspect ratios. Extended runs proved the process window of the chamber was very wide, the stability and the uniformity of the process were superior, and particle addition was very low. The etch rates of BPSG and TEOS are about 7500 and 4700 Å/m, respectively, when running at 1000 W on MxP+, which is about 30% to 40% higher than that of MxP. Also, through hardware and process innovations, no periodic dry cleans are needed for the MxP+ to maintain excellent particle performance. Furthermore, the cost‐of‐consumables is dramatically reduced and the new design of process kits extends its lifetime by a factor of 2 for a much reduced cost.

 

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