Ares—µVOC air molecular pollutant monitoring system
It detect continuously @ sub ppb level:
2-Butanone ,Trymethyl.silanol , Acetone ,Ethanol,Isopropanol, Cyclohexane, Ethyl Lactate, N-Hexane, Ethyl benzene,Butanol, Butylacetate, M,p xylene, Styrene , Benzene, Toluene, HMDS, PGMEA…and many others
Airborne molecular contamination (AMC) is a concern for any high technology manufacturing process, especially in the microelectronics industry. Organic contamination may cause adverse effects on production tools and consequently increase costs for high-tech companies.
Contamination -free manufacturing is a viable goal and is achieved by source control and source monitoring in combination with filtration solutions in air handling systems. Permanent monitoring of the AMC level helps identifying sources, stabilizes production and prevents unexpected shortfalls of the service life of filtration units.
uVOC-CAM gives our customers the ability to measureonline over a long period of time without taking specific point-of-time samples like when using a sampler.
The detection limit nevertheless is as low sub ppb level.
The level of AMC contamination in cleanroom environments is predominately created by internal sources of solvents and acetic acid, re-entrainment of exhaust air, aromatic compounds from ambient air and return air as well as material outgassings. Even more important, spills, leaks and mishandling have to be taken into account and can cause serious costs in terms of wafer loss and tool-down time.
Contamination Issues: From the Cleanroom to tool With the increase in complexity and production cost of IC products, airborne molecular contamination monitoring is becoming more important.
Contamination is expanding from the tool to the entire clean room and to an increased number of compounds.
Molecular contamination may originate from many sources. Process chemicals,outgassing by construction materials, cleanroom components, as well as people, are responsible for the in situ generated contamination.
µ-VOC System represents a means to potentially identify the correlation between airborne molecular
contamination and yield and defect issues. The complete range of compounds is analyzed in real time at sub-ppb levels, offering an early detection of contamination and a quick identfication of its cause.
H IGHLIGHTS General Features
•Fully automatic system for on line continuous quality control
•Detection of VOC
•Speciation and identification of organic compounds
•Sub-ppb detection limit
•Integrated PC for instrument control and data acquisition
Tracking the origin of contamination via speciation Many chemicals used in the manufacturing process oten theselves become the cause of contamination. Ammonia is a well known contaminant in the litography process. Among its possible sources is the dissociationof hexamethyldisilazane (HMDS) into trymethylsilanol and ammonia. With the capability to speciate µ-VOC system is instrumental in tracking the time and the origin of the contamination process.
APPLICATIONS
•Cleanroom contamination Monitoring
•Filter status check
•Tool contamination diagnosis via full speciation
Tracking the origin of contamination via speciation Many chemicals used in the manufacturing process oten theselves become the cause of contamination. Ammonia is a well known contaminant in the litography process. Among its possible sources is the dissociationof hexamethyldisilazane (HMDS) into trymethylsilanol and ammonia. With the capability to speciate µ-VOC system is instrumental in tracking the time and the origin of the contamination process.
Cross Contamination represents another key issue in the cleanroom control. In fact, due to the air circulation pattern inside the cleanroom, a solvent used in a specific manufactuirn area could become a dangerous contaminants in another area where a different process is run. Thanks to its capability of identifying the specific organic compound the µ-VOC Sytem offers a unique solution in determining cases of cross contamination.
Checking the filter investment The installation of chemical filters either on the recirculating air system of the cleanroom air or on the tools represents a big economic investment. Filter replacement according to a set maintenance scheme could unnecessarily increase an already high cost if working filters are changed too early or it could cause inadequate protection if exhausted filters are changed too late. With up to 16 channels, the µ-VOC system allows monitoring both upstream and downstream of the filters. The sample point upstream detects when the incoming air is not within the filter specification, while the monitoring point downstream indicates when the absorbing capability is exhausted.
A process tool The µ-VOC system has been designed to be an analytical process tool for continuous unattended operation. It automatically samples up to 16 pointsand for each of them different alarm can be set. Its capability to be transportable, makes of the µ-VOC system a very useful tool to understand contamination monitoring causes.. On board calibration is included, to match the stringen quality control rules. Results are displayed in real time and are expressed as concentration values, with no calculation to be run Remote connection to the customer’s network is provided as standard.
Theory of Operation GC has long been the technology of choice when complex molecules need to be separated and identified. This method depends on the volatilization of a complex sample and an equilibrium of absorption of the various components by the stationary phase of a chromatographic column
As the components elute from the column they are monitored by the change in electrical conductance by a hydrogen/air flame ionization detector (FID). The FID will reflect the presence of organic compounds. The unique purge and trap system of sampling allows sub-ppb detection limits.
Principle of operation: Gas Cromatography with Flame Ionization Detector
Analyser Range: 0-200 ppb
Dimension (HxWxD) 160 cm x 60 cm x 80 cm
Enclosure Nema 12 or IP54 stainless steel console
Operating temperature: 10°C—35 °C
Communication: RS-232, Ethernet, ODBC
Power: 230 Vac, 50/60 Hz 900 watts maximum
Gas Required: CDA 5 l/min H2 130 sccm (optional H2 generator)
Sampling Channels: Up to 16
Resolution: 0,1 ppb
Detected Compounds: Up to 30, user defined