More stringent IPCC guidelines include accounting for CF4 by-product formation and emissions.
The Intergovernmental Panel on Climate Change (IPCC), the United Nations’ body for assessing the science related to climate change, has just released the latest refinement to its 2006 Guidelines. As part of an effort to tackle climate change, the refined regulations tighten control on new greenhouse gases used in semiconductor manufacturing and increase requirements for reporting and accountability for manufacturers.
The IPCC has recognised that there is a gap between the amount of greenhouse gas measured in the atmosphere and the amount calculated from the inventory of known sources of emission. The gap is of particular concern for gases such as perfluoro compounds (PFCs), which not only have extraordinarily high global warming potentials (GWP) but also extremely long lifetimes in the atmosphere, as long as 50,000 years.
Prof. Mike Czerniak, Visiting Industrial Professor, Bristol University, and Environmental Solutions Business Development Manager, Edwards.
Two new mechanisms for PFC formation during semiconductor manufacturing have been identified and emission factors have been added to the latest IPCC refinement:
- CF4 formation when cleaning chemical vapor deposition (CVD) chamber deposits.
- CF4 formation by reaction of fluorine with hydrocarbon fuel in combustion-based abatement in systems that mix the fuel and process chamber effluent.
“For the first time ever, there is a new emission factor for combustion-based abatement of fluorine - direct accountability is now required, in the form of a data-backed certification from the equipment manufacturer that the reaction is minimised,” said Prof. Czerniak. “PFC formation can be minimised by appropriate combustor design.”
Edwards’ inward-fired combustor avoids the mixing of chamber exhaust and fuel that, in other designs, can lead to the production of PFCs where they did not exist in the original exhaust stream. The lower, more uniform temperature profile of the inward-fired combustor ensures a high destruction removal efficiency (DRE), with low NOx generation. Inward-fired combustors have been standard on Edwards’ abatement systems since the company started developing them in the 1990s.
Visit Edwards (booth #750) during SEMICON West to learn more about the latest IPCC guidelines and best practices for reducing greenhouse gases. SEMICON West takes place July 9-11, 2019, in San Francisco, Calif. Further information about Edwards can be found at www.edwardsvacuum.com.
About Edwards
Edwards is celebrating its 100-year birthday in 2019. The founder, FD Edwards, began by providing vacuum equipment from a small office in South London; 100 years later Edwards has over 6,000 employees worldwide engaged in the design, manufacture and support of high technology vacuum and exhaust management equipment.
Edwards’ innovations are integral to manufacturing processes for semiconductors, flat panel displays, LEDs and solar cells. They are also used within an increasingly diverse range of industrial processes including power, glass and other coating applications; steel and other metallurgy; pharmaceutical and chemical; and for scientific instruments in a wide range of R&D applications. Edwards has state-of-the-art manufacturing facilities in Europe, Asia and North America.
About the Intergovernmental Panel on Climate Change (IPCC)
The IPCC is the scientific organization supporting the United Nations Framework Convention on Climate Change (UNFCCC). Organized by the United Nations and the World Meteorological Organization, the IPCC’s reports provide the scientific underpinnings for the international climate negotiations that led to the 1997 Kyoto Protocol and the 2015 Paris Agreement on climate change. The IPCC reviews the state of the science of climate change every 5-7 years. For more information, visit https://www.ipcc.ch.