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Means and method for connecting thin metal layers

A thin metal layer and connection method technology, applied in metal processing equipment, welding equipment, laser welding equipment, etc., can solve the problem of not providing solar cell electrode connection

Inactive Publication Date: 2011-02-09
EUROPEAN SPACE AGENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not provide for the connection of solar cell electrodes

Method used

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  • Means and method for connecting thin metal layers
  • Means and method for connecting thin metal layers
  • Means and method for connecting thin metal layers

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Embodiment 1

[0062] The present invention now describes in more detail the joining of a molybdenum thin film to a flexible small copper contact strip by a riveting process. This molybdenum thin film is used on the back contact layer of solar cells, such as CIGS solar cells, such as figure 1 shown. As far as this riveting process is concerned, the upper layer of the solar cell is used as the front contact layer, absorber layer, etc. In order to reveal the metal molybdenum layer, the front contact layer may be removed mechanically or laser ablated until the rear contact layer, such as image 3 (a) shown.

[0063] The polymer base film of the prepared solar cell can be removed by laser ablation method. In order to remove the polymer base film of the solar cell, the front side of the solar cell is closely attached to a holder in the ablated area behind the polymer base film and irradiated by laser light with sufficient pulse energy. To gradually ablate the polymer film (thickness about 25 m...

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Abstract

Disclosed are a configuration for bonding a thin metal layer to two workpieces {B} and {A}, e.g. solar cells and film-backed / reinforced small contact strips as well as a method for the stable production of such a connection, comprising the following steps: (i) the backing film is removed from the solar cell; (ii) the two films / layers are pressed together; and (iii) the two parts are irradiated from the side of the rear contact {} of the thin-film solar cell. According to the invention, preferably two or three laser treatment steps are used for removing the backing film of the thin-film solar cell in an ablation process by means of a short-pulse laser and riveting the first metal layer, e.g. the rear contact of the solar cell, to the second metal layer, e.g. the small contact strip, by irradiating the same by means of a long-pulse laser. The energy density, pulse duration and temporary pulse form, pulse frequency, and wavelength for the ablation process and the welding / riveting processare selected according to the specific materials used. Such a laser riveting process can be used for electrically contacting thin-film solar cells with small flexible contact strips.

Description

technical field [0001] The invention relates to a connecting device and a connecting method of two metal layers applied on a flexible substrate, in particular to the electrical connection of a thin-film solar cell to a flexible circuit board and a manufacturing method. Background technique [0002] Currently, different types of thin-film solar cells that convert sunlight into electricity are under development. figure 1 It is a structural schematic diagram of a battery, which basically includes a front contact layer 5 , a rear contact layer 2 and a semiconductor absorption layer 3 . The front contact layer faces the incident light and consists of a transparent conductive oxide (TOC), and the back contact layer consists of a metal layer. The semiconductor absorber layer 3 for photoelectric conversion may be composed of different materials, for example, amorphous silicon and microcrystalline silicon or polycrystalline silicon, copper indium gallium selenide (CIGS) and other se...

Claims

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Application Information

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IPC IPC(8): H01L31/02B23K26/32
CPCH01L31/02008Y02E10/50
Inventor 克劳兹·齐默亚历山大·布劳恩卡斯滕·奥蒂罗萨·格拉齐
Owner EUROPEAN SPACE AGENCY
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