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Thin-film solar cell and process for its manufacture

A solar cell, solar-grade technology, applied in final product manufacturing, sustainable manufacturing/processing, circuits, etc.

Inactive Publication Date: 2010-12-29
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass softens at temperatures between 600°C and 700°C, which makes the glass only useful for low-temperature battery processing

Method used

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  • Thin-film solar cell and process for its manufacture
  • Thin-film solar cell and process for its manufacture
  • Thin-film solar cell and process for its manufacture

Examples

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Embodiment Construction

[0033] figure 1 In a cross-sectional view, a first embodiment of the solar cell of the invention is shown.

[0034] The base layer 1 and the emitter layer 1' of the solar cell surround a through hole in the low cost substrate 2. This is achieved by simultaneously depositing said layers of the solar cell on the front surface of the substrate and directly into the vias. The substrate can be highly doped and highly conductive. Thus, the substrate can be used to conduct current laterally to the base contacts, which allows more flexibility in the design of interdigitated contacts. It is also possible to use an insulating substrate, in which case the deposited base should serve to conduct electricity. The rear surface of the substrate can be destroyed without reducing the efficiency of the solar cell, which greatly simplifies the determination of the interdigitated contact pattern. Metal 3 can be deposited over the entire rear surface, and then the base and emitter contact...

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Abstract

The present invention refers to a thin- film solar cell which is contacted from the rear- side. The invention is based on a combination of thin- film solar cells, e.g. wafer equivalents, with the emitter wrap- through (EWT) technology. The present invention also provides a process for manufacturing these solar cells.

Description

technical field [0001] The invention relates to a backside contact thin film solar cell. The present invention is based on the combination of Emitter Wrap-through (hereinafter referred to as: EWT) technology and thin film solar cells such as wafer equivalents. The present invention also provides methods of manufacturing these solar cells. Background technique [0002] It is known from the prior art that thin film solar cells have been developed for many years. The idea is to use a low cost substrate to save material costs. Solar cells are deposited on a substrate, such as epitaxial silicon, and the resulting structure can resemble a standard wafer solar cell. [0003] In the prior art, there are three types of thin film solar cells according to the type of substrate used. [0004] The first type of substrate is glass, which is favored because it can serve a dual purpose as cell encapsulation. However, glass softens at temperatures between 600°C and 700°C, which makes th...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18
CPCH01L31/1804H01L31/022458H01L31/022433Y02E10/547Y02P70/50
Inventor 埃米莉·米切尔斯特凡·勒贝伊夫琳·施米希
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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