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Laser annealing device and laser annealing method

A technology of laser annealing and laser pulse, which is applied in the direction of laser welding equipment, electrical components, circuits, etc.

Active Publication Date: 2013-04-03
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the time to reach the peak is instantaneous, it is difficult to sufficiently heat the deep region of the annealing object

Method used

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  • Laser annealing device and laser annealing method
  • Laser annealing device and laser annealing method
  • Laser annealing device and laser annealing method

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Experimental program
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Embodiment Construction

[0026] figure 1 A schematic diagram of a laser annealing apparatus based on an embodiment is shown in . The laser light source 12 is driven by the driver 10 . The laser light source 12 uses, for example, a laser diode with an oscillation wavelength of 690 nm to 950 nm. In this embodiment, a laser diode with an oscillation wavelength of 800 nm is used.

[0027] The laser light source 12 has a plurality of horizontally long light emitting points. The plurality of light emitting points are arranged in a row in the direction of the long sides. The size ratio of the major axis direction and the minor axis direction of each light emitting point is, for example, 100:1. The dimension in the long-axis direction of the light-emitting points is almost equal to the interval between two adjacent light-emitting points. In other words, the luminous points and non-luminous regions are alternately arranged at equal intervals.

[0028] Generally, the spread angle of the laser beam in the ...

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Abstract

Provided are a laser annealing device and a laser annealing method. A general pulse waveform rises sharply from a starting time point of oscillation, shows a peak, and thereafter, decreases gently. At the time point when power shows a peak, the surface of an annealing object is sharply heated and reaches a high temperature. Since time showing the peak is an instant, it is difficult to sufficiently heat a deep region of an annealing object. A laser pulse is emitted from a laser diode when a pulse current is input. An optical system that guides a laser beam emitted from the laser diode to an annealing object. A driver supplies a pulse current that has a time waveform of a top flat and a pulse width of 1 [mu]s to 100 [mu]s to the laser diode.

Description

technical field [0001] The invention relates to a laser annealing device and a laser annealing method. Background technique [0002] In the heat treatment of semiconductor wafers, especially silicon wafers, heating in electric furnaces and rapid thermal annealing (RTA) are generally used. The heating time when applying RTA is on the order of milliseconds. In recent years, the application of laser spike annealing with a heating time shorter than 1 μs is also advancing. [0003] In laser spike annealing in which the heating time is shorter than 1 μs, the temperature gradient in the thickness direction of the semiconductor wafer becomes steep due to the short heating time. Therefore, it is difficult to heat the deep region to a desired temperature without excessively raising the surface temperature of the semiconductor wafer. On the other hand, in RTA, since the heating time is long, the temperature of the entire semiconductor wafer rises. Due to the temperature rise of the...

Claims

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Application Information

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IPC IPC(8): H01L21/268B23K26/06H01L21/02H01L21/265H01L21/336H01L29/739H01L29/78
CPCB23K26/0732B23K26/0738B23K26/0622B23K2101/40H01L21/268H01L29/7395H01L21/26
Inventor 若林直木万雅史
Owner SUMITOMO HEAVY IND LTD
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