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Multiple station scan displacement invariant laser ablation apparatus

A technology of laser beam and scanning path, which is applied in laser welding equipment, photovoltaic power generation, sustainable manufacturing/processing, etc., and can solve problems such as large contact size

Inactive Publication Date: 2008-05-28
PALO ALTO RES CENT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, however, low-cost fabrication methods such as screen printing can easily make contact sizes that are larger than necessary

Method used

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  • Multiple station scan displacement invariant laser ablation apparatus
  • Multiple station scan displacement invariant laser ablation apparatus
  • Multiple station scan displacement invariant laser ablation apparatus

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Embodiment Construction

[0071] The present invention relates to improvements in photovoltaic devices, such as solar cells, which are used, for example, to convert solar energy into electrical energy. The description given below is intended to enable one of ordinary skill in the art to make and use the invention within the scope of its particular application and its requirements. As used herein, directional terms such as "above", "below", "side", "front", "rear" are intended to provide relative positional relationships for descriptive purposes and are not intended to identify absolute reference structures . Various modifications to the preferred embodiment will be apparent to those skilled in the art, so the general principles presented here can be applied to other embodiments as well. Thus, the present invention is not limited to the specific embodiments shown and described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0072] FI...

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Abstract

A laser scanning mechanism and multiple processing stations are circumferentially disposed around a central axis. The laser scanning mechanism includes a rotating member driven by a motor to rotate around the central axis, and an optical system fixedly mounted on the rotating member and arranged to redirect input laser beam pulses from the central axis along a circular scan path. Each station including a mechanism for moving a corresponding target object radially across the circular scan path. The laser beam pulses output from the scanning mechanism can be used to process (e.g., ablate material from) multiple target objects simultaneously. The laser scanning mechanism redirects the input laser beam pulses such that the laser beams remain on-axis and in focus as they are scanned along the circular (curved) scan path. A system for producing photovoltaic devices utilizes the laser ablation apparatus and a direct-write metallization apparatus.

Description

technical field [0001] The present invention relates to the conversion of light radiation into electrical energy, and more particularly, the invention relates to methods and tools for the manufacture of photovoltaic devices (solar cells) that convert solar energy into electrical energy. Background technique [0002] Solar cells are typically photovoltaic devices that directly convert sunlight into electricity. Solar cells typically include semiconductors (eg, silicon) that absorb optical radiation (eg, sunlight) in a manner that generates free electrons that are in turn induced to flow by a built-in electric field to generate direct current (DC) power. The DC power generated by several PV cells is gathered on a grid placed on the cells. The current flowing from multiple PV cells is then combined into higher currents and higher voltages through series and parallel combinations. The DC power thus harvested is then routed through wires, often dozens or hundreds of wires. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/06B23K26/08H01L31/18
CPCB23K26/067Y02E10/50H01L31/1876B23K26/0635B23K2201/40B23K26/0624B23K2101/40Y02P70/50H01L31/04H01L31/18
Inventor D·N·柯里
Owner PALO ALTO RES CENT INC