半导体材料和应用PPT课件

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The performance of semiconductor
• its conductivity increases with increasing temperature and in the presence of impurities.
• Photovoltaic effect. • photoconductive effect. • Unidirectional Conductivity .
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• When the solar cell surface exposed to the light, making the electrons transition, gathering to form a potential difference on both sides of the P-N junction.
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integrated circuit
• The advantages of integrated circuits as follows: small size,light weight,long life ,high reliability and performance.
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semiconductor laser
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• advantages:
• 1),Solar power is nonpolluting
• 2),The light and energy from the sun is free
• 3),Solar cells require very little maintenance
• 4),solar power is silent powered
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The simple principle of semiconductor materials
• a substance as germanium (锗) or silicon（硅） whose electrical conductivity is intermediate between that of a metal and an insulator.
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LED
•LED converts electrical energy into light. •advantages:led lighting with energy efficient, low-carbon environment, small size, high strength, low voltage drive, high stability of the lamp,high waterproof ,etc
• In 1954,the first solar cell was invented by Chap in Bell labs.
• In1958-1959，a simple integrated circuit came out to the public
• In 1962, Hall invented the first semiconductor laser
• compared to the Ordinary laser ，advantages：
• 1），longer life， • 2），smaller size， • 3），Less consumption of
electricity • 4），Higher efficiency
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Prospects for the development of semiconductor devices
The development and application of semiconductor materials
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Outline
• 1，Background introduction
• 2, The simple principle of semiconductor materials
• 3, The performance of semiconductor materials
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Application and advantages of semiconductor materials
• solar cells • Light Emitting Diode (LED) • integrated circuit (IC) • semiconductor laser
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solar cells
• 4, Application and advantages of semiconductor materials
• 5, Prospects for the development of semiconductor devices
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Background
• In 1947,the first transistor was invented by John Bardeen and Walter Brattain in Bell labs.
• some productions showing the semiconductor used in different areas
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summary
• The simple principle of semiconductor material,Application and advantages of semiconductor material,Prospects for the development of semiconductor devices:Semiconductor street lights,thermometer,air-conditioning