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Si Circuits, Optical Fibers, And Alingap And Ingan Light-Emitters

  • J. D. Dow
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)

Fifty years ago, there were three major questions facing the physics of semiconductors: (i) Would Si, having replaced Ge only a few years before, maintain its position as the dominant semiconductor, or would Si be replaced by faster semiconductors, such as III–V semiconductors (e.g., GaAs); (ii) would the direct-gap III–V semiconductors produce efficient light-emitters; and (iii) would optical fibers become sufficiently transparent to make light-wave communications possible?

Si is for circuits. The biggest surprise of the intervening fifty years is that Si became, and still is, the dominant semiconductor for electrical circuits in modern semiconductors. The first transistor was fabricated at Bell Laboratories out of Ge by Bardeen and Brattain, but Shockley showed that Si was better for transistor technology, and Si has remained dominant ever since. Even the future seems likely to be dominated by Si, which is currently being used for three-dimensional circuits. Hopes for faster useful transistors made out of III-V semiconductors, have dimmed in recent years, and so, all but a few of the III–V fabrication lines for electronic devices have been abandoned.

Optical fibers and Urbach's Rule. In the late 1960s there was a question of whether optical fibers were possible, and how long a fiber is compatible with transmission of visible light. At the time, fibers capable of transmitting light about a meter were in existence, and the question was whether this distance could be increased to over one km. The increase has occurred.

III–V light emitters. Si is not a candidate for light emission, since it is an indirect-gap semiconductor. The preferred light-emitting semiconductors are currently Al 1−xy In x GayP or In1−x Ga x N, and cover the visible spectrum from red to violet and white. So now it is possible to compute with Si, to transmit the computed information over optical fibers, and to fabricate light-emitting diodes of most visible colors.

Keywords

optical fibers light emitters 

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Copyright information

© Springer Science + Business Media B.V 2008

Authors and Affiliations

  1. 1.Department of PhysicsArizona State UniversityTempeUSA

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