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The 1.7 Kilogram Microchip:  Energy and Material Use in the Production of Semiconductor Devices | Environmental Science & Technology
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    The 1.7 Kilogram Microchip:  Energy and Material Use in the Production of Semiconductor Devices
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    United Nations University, 53-67 Jingumae 5-chome, Shibuya-ku, Tokyo, Japan, INSEAD, Boulevard de Constance, Fontainebleau, 77305 Cedex, France, and National Science Foundation, 4201 Wilson Boulevard, Arlington, Virginia 22230
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2002, 36, 24, 5504–5510
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    https://doi.org/10.1021/es025643o
    Published October 25, 2002
    Copyright © 2002 American Chemical Society
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    Abstract

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    The scale of environmental impacts associated with the manufacture of microchips is characterized through analysis of material and energy inputs into processes in the production chain. The total weight of secondary fossil fuel and chemical inputs to produce and use a single 2-gram 32MB DRAM chip are estimated at 1600 g and 72 g, respectively. Use of water and elemental gases (mainly N2) in the fabrication stage are 32 000 and 700 g per chip, respectively. The production chain yielding silicon wafers from quartz uses 160 times the energy required for typical silicon, indicating that purification to semiconductor grade materials is energy intensive. Due to its extremely low-entropy, organized structure, the materials intensity of a microchip is orders of magnitude higher than that of “traditional” goods. Future analysis of semiconductor and other low entropy high-tech goods needs to include the use of secondary materials, especially for purification.

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     Corresponding author phone:  81−3−5467−1352; fax:  81−3−3406−7246; e-mail:  [email protected].

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     United Nations University.

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     INSEAD.

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     National Science Foundation.

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    Section A, discussion comparing data sources on chemical use and emissions in semiconductor fabrication; section B, input/output data on wafer fabrication processes; section C, details of estimation of energy required for production of chemical inputs to fabrication of integrated circuits, and section D, reference tables. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: Environ. Sci. Technol. 2002, 36, 24, 5504–5510
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