Solar cell having a plurality of absorbers connected to one another by means of charge-carrier-selective contacts

A technology of solar cells and absorbers, applied in the field of solar cells, can solve problems such as degradation and achieve the effect of minimizing electrical loss

Active Publication Date: 2018-07-31
INST FUR SOLARENERGIEFORSCHUNG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the electrical properties of these heterojunctions are usually severely degraded at temperatures above 200 °C

Method used

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  • Solar cell having a plurality of absorbers connected to one another by means of charge-carrier-selective contacts
  • Solar cell having a plurality of absorbers connected to one another by means of charge-carrier-selective contacts

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Embodiment Construction

[0033] figure 1 A schematic diagram showing a tandem solar cell according to the first of two preferred embodiments of the present invention.

[0034] Such as figure 1 As shown, the tandem solar cell has two different absorbers 104, 108 made of different materials. Alternatively, more than three different absorbent body materials may be used. In either case, according to the invention, the first absorber is made of silicon ( figure 1 108 in).

[0035] The silicon absorber 108 can be, for example, a wafer made of crystalline silicon, in particular monocrystalline or polycrystalline silicon. Saw damage is removed from the surface of the silicon absorber 108 if necessary. The thickness of the silicon absorber 108 is generally in the range of 30-500 μm, preferably 50-300 μm. The horizontal size is usually 0.1×0.1cm 2 up to 200×200cm 2 In the range. The silicon absorber 108 can be p-doped, n-doped or undoped or intrinsic. The silicon absorber 108 preferably has the same d...

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Abstract

A tandem solar cell structure is described, having the following features: (a) a monolithic structure having at least two different absorbers (104, 108) made from different materials for photovoltaicenergy conversion, (b) an absorber (108) consisting of crystalline silicon, (c) a charge-carrier-selective contact on that side of the silicon absorber (108) which is directed to the adjoining absorber (104), (d) a structure of the charge-carrier-selective contact made from a thin interface oxide 107 and an amorphous, semi-crystalline or polycrystalline layer which consists mainly of silicon, is either p-doped (106) or n-doped (201), and is applied to said contact. The charge-carrier-selective contact constructed from the layers 107 and 106 or 201 ensures excellent surface passivation of the crystalline silicon absorber 108 and the selective extraction of a charge carrier type from the latter over the entire surface. A vertical current flow is therefore achieved, with the result that lateral transverse conductivity is not required in each sub-cell. High doping of the layer 106 or 201 may form a tunnel contact with respect to the adjoining layer. The thickness and/or doping of the layer106 or 201 can be used to adjust the generation currents in the individual sub-cells. The temperature stability of the layers 107, 106 or 201 makes it possible to use subsequent production steps at temperatures of > 400 DEG C.

Description

technical field [0001] The present invention relates to solar cells, in particular to tandem solar cells with multiple absorbers. Background technique [0002] Solar cells are used to convert the energy of sunlight into electrical energy using the photoelectric effect. However, depending on the absorber material, only a certain part of the solar spectrum can be effectively used. For example, if the absorber is made of a semiconductor material, photons with energies below the bandgap may not directly contribute to the generation of electron-hole pairs and thus are hardly absorbed. Photons with energies well above the bandgap generate electron-hole pairs, but electrons and holes from excited high-energy states thermalize to low-energy states near the band edge, and therein release the energy difference as heat. [0003] One way to minimize these two loss mechanisms in the high-energy and low-energy photon regions is to use two or more absorbers made of different materials th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/078H01L31/0747H01L31/0725
CPCH01L31/0725H01L31/0747H01L31/078Y02E10/549Y02P70/50H10K30/57H01L31/0328Y02E10/546Y02E10/548Y02E10/50H10K30/10H01G9/20
Inventor 罗比·派博斯特
Owner INST FUR SOLARENERGIEFORSCHUNG
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