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KMID : 1039220150250020202
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Journal of Korean Society of Occupational and Environmental Hygiene
2015 Volume.25 No. 2 p.202 ~ p.210
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Clean Room Structure, Air Conditioning and Contamination Control Systems in the Semiconductor Fabrication Process
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Choi Kwang-Min
Lee Ji-Eun
Cho Kwi-Young
Kim Kwan-Sick
Cho Soo-Hun
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Abstract
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Objectives: The purpose of this study was to examine clean room(C/R) structure, air conditioning and contamination control systems and to provide basic information for identifying a correlation between the semiconductor work environment and workers`` disease.
Methods: This study was conducted at 200 mm and 300 mm semiconductor wafer fabrication facilities. The C/R structure and air conditioning method were investigated using basic engineering data from documentation for C/R construction. Furthermore, contamination parameters such as airborne particles, temperature, humidity, acids, ammonia, organic compounds, and vibration in the C/R were based on the International Technology Roadmap for Semiconductors(ITRS). The properties of contamination control systems and the current status of monitoring of various contaminants in the C/R were investigated.
Results: 200 mm and 300 mm wafer fabrication facilities were divided into fab(C/R) and sub fab(Plenum), and fab, clean sub fab and facility sub fab, respectively. Fresh air(FA) is supplied in the plenum or clean sub fab by the outdoor air handling unit system which purifies outdoor air. FA supply or contaminated indoor air ventilation rates in the 200 mm and 300 mm wafer fabrication facilities are approximately 10-25%. Furthermore, semiconductor clean rooms strictly controlled airborne particles(≤ 1,000 #/ft³), temperature(23±0.5℃), humidity(45±5%), air velocity(0.4 m/s), air change(60-80 cycles/hr), vibration(≤ 1 cm/s²), and differential pressure(atmospheric pressure + 1.0-2.5 mmH2O) through air handling and contamination control systems. In addition, acids, alkali and ozone are managed at less than internal criteria by chemical filters.
Conclusions: Semiconductor clean rooms can be a pleasant environment for workers as well as semiconductor devices. However, based on the precautionary principle, it may be necessary to continuously improve semiconductor processes and the work environment.
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KEYWORD
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air conditioning, clean room structure, contamination control system, semiconductor work environment
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