Crystalline solar cell and method for producing such solar cell

Abstract

The invention relates to a single-sided or double-sided crystalline solar cell, on the front side of which a first surface passivation layer is arranged over the entire surface directly on the semiconductor interface and above which a first optically non-transparent conductive material is arranged in a first lateral region The first optically transparent conductive material is provided as a front contact and only in the second lateral region. The first optically transparent electrically conductive material is in this case electrically conductively connected to the front contact and to the first region of the semiconductor material. The method according to the invention provides that the first optically transparent electrically conductive material is not applied until after the first optically non-transparent electrically conductive material is applied, so that burn-through of the front contacts is avoided. It is particularly advantageous to apply the first optically transparent conductive material as the doped metal oxide directly before the deposition of the first antireflection layer on the solar cell front side by means of PECVD and in the same apparatus without interrupting the vacuum.

Description

technical field [0001] The invention relates to a crystalline solar cell made of semiconductor material with a transparent conductive layer on the front side between electrical contacts and a method for producing such a solar cell. Background technique [0002] A conventional silicon solar cell consists of two oppositely doped regions of monocrystalline or polycrystalline semiconductor material. In this case by adding a dopant to the semiconductor material or by applying a layer made of the same semiconductor material to a first layer of semiconductor material with the second layer having a doping opposite to that of the first layer, in both A direct pn junction is formed between the regions. Such solar cells are also referred to as homogeneous cells, in contrast to heterogeneous cells which are made of different semiconductor materials or which also have an intrinsic layer (pin junction) between n-layer and p-layer. Another structure of the semiconductor, such as an amorp...

AI Technical Summary

Problems solved by technology

[0007] Burn-through, however, results in a strong thermal load on the layer stack, which can lead not only to undesired effects in the semiconductor material but also to a degradation of the electrically conductive optically transparent material, which in turn limits the electrical contacting of the semiconductor material and the performance of the solar cell. improve

Furthermore, the burn-through step is associated with high cost and time

Additionally, adhesion problems with metals on conductive optically transparent materials have been observed, which lead to reduced long-term stability and ultimately solar cell failure

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