CN211480087U - Silicon-based double-sided organic/inorganic heterojunction solar cell - Google Patents

Silicon-based double-sided organic/inorganic heterojunction solar cell Download PDF

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CN211480087U
CN211480087U CN202020205415.3U CN202020205415U CN211480087U CN 211480087 U CN211480087 U CN 211480087U CN 202020205415 U CN202020205415 U CN 202020205415U CN 211480087 U CN211480087 U CN 211480087U
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solar cell
silicon
amorphous silicon
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王璞
王永谦
王岚
李忠涌
苏荣
丁蕾
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Tongwei Solar Meishan Co Ltd
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Abstract

The application provides a silicon-based double-sided organic/inorganic heterojunction solar cell, and relates to the technical field of solar cells. The silicon-based double-sided organic/inorganic heterojunction solar cell comprises a positive metal electrode layer, a wetting additive protection layer, PEDOT, a PSS hole transport layer, a first intrinsic amorphous silicon passivation layer, an n-type silicon substrate layer, a second intrinsic amorphous silicon passivation layer, an n-type amorphous silicon doping layer, a transparent conducting substance oxidation layer and a back metal electrode layer which are sequentially stacked. Which can improve the efficiency of the solar cell.

Description

Silicon-based double-sided organic/inorganic heterojunction solar cell
Technical Field
The application relates to the technical field of solar cells, in particular to a silicon-based double-sided organic/inorganic heterojunction solar cell.
Background
At present, in the market of mass production type solar cells, crystalline silicon solar cells account for more than 85%, double-sided cells are produced in mass production, waste of substrate silicon wafers is reduced, sunlight is fully utilized, and the solar cell has great potential in the aspect of photovoltaic building integration.
How to improve the efficiency of the double-sided battery to obtain the battery becomes a research hotspot of scientific research institutes and photovoltaic enterprises in the world nowadays.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a silicon-based double-sided organic/inorganic heterojunction solar cell, which can improve the efficiency of the solar cell.
The embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a silicon-based double-sided organic/inorganic heterojunction solar cell, which includes a positive metal electrode layer, a wetting additive protection layer, a PEDOT, a PSS hole transport layer, a first intrinsic amorphous silicon passivation layer, an n-type silicon substrate layer, a second intrinsic amorphous silicon passivation layer, an n-type amorphous silicon doping layer, a transparent conductive oxide layer, and a back metal electrode layer, which are sequentially stacked.
In the technical scheme, the main component of the PEDOT/PSS hole transport layer is (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid), the PEDOT/PSS hole transport layer is used as a window layer of incident light of the solar cell, the energy band gap can be adjusted, more photogenerated carriers can be excited, and the parasitic absorption of the incident light is reduced. And the PEDOT/PSS hole transport layer has high mobility, can efficiently transport hole carriers, prevent the passage of electron carriers, play a role in selective transport and improve the efficiency of the solar cell. And the PEDOT and PSS hole transport layer is cheap in raw materials and suitable for large-scale mass production. In addition, the wetting additive protective layer can increase the wetting property of the PEDOT, namely the PSS hole transport layer and the n-type silicon substrate layer, so that the PEDOT and the PSS hole transport layer are contacted more tightly and firmly, the contact resistance of the metal electrode is reduced, and the efficiency of the solar cell is improved.
In one possible embodiment, the wetting additive protective layer comprises aluminum metal particles and a fluoride ion polymer.
In the technical scheme, the fluorine ion polymer has chemical bonds, so that the adhesive force of a PSS hole transport layer and a first intrinsic amorphous silicon passivation layer of PEDOT can be increased; in addition, the aluminum metal particles can increase the activity of the metal surface and increase the surface temperature, thereby being beneficial to increasing the pulling force of the screen printing low-temperature silver paste. Under the action of the wetting additive protective layer containing aluminum metal particles and fluorine ion polymer, the contact between the PEDOT/PSS hole transport layer and the n-type silicon substrate layer is tighter and firmer, the contact resistance of the metal electrode is reduced, and the efficiency of the solar cell is improved.
In one possible embodiment, the aluminum metal particles have a particle size of 800 to 1000 nm.
In the technical scheme, the aluminum metal particles in the particle size range are more favorable for increasing the activity of the metal surface, so that the PEDOT/PSS hole transport layer is contacted with the n-type silicon substrate layer more tightly and firmly, and the efficiency of the solar cell is improved.
In one possible embodiment, the fluoride ion polymer is selected from any one of hexafluoropropylene and polytetrafluoroethylene.
In the technical scheme, hexafluoropropylene and polytetrafluoroethylene have chemical bonds and stronger acting force than molecules, and the adhesion force of a PEDOT (polymer ethylene terephthalate) (PSS) hole transport layer and a first intrinsic amorphous silicon passivation layer can be better increased.
In one possible embodiment, the thickness of the wetting additive protective layer is 10 to 30 μm.
In the technical scheme, the thickness of the wetting additive protection layer is set to be 10-30 mu m, so that the function of increasing the wetting property of a PEDOT (PSS) hole transport layer and an n-type silicon substrate layer can be better ensured, and the influence of too thick thickness on the cell efficiency of the solar cell can be avoided.
In one possible embodiment, both the positive metal electrode layer and the back metal electrode layer contain Cu.
In the above technical solution, the positive metal electrode layer and the back metal electrode layer both contain Cu, so that the positive metal electrode layer and the back metal electrode layer have good conductivity, and the collection rate of carriers can be increased.
In one possible embodiment, the positive metal electrode layer further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn, and Ag;
and/or the back metal electrode layer further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn and Ag.
In the above technical solution, the positive metal electrode layer further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn, and Ag, and these metal elements are used together with Cu, which can reduce the cost and ensure the conductivity and the battery efficiency, compared to using Cu alone. In addition, the back metal electrode layer further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn, and Ag, and these metal elements are used together with Cu, so that the cost can be reduced and the conductivity and the battery efficiency can be ensured compared to the case where Cu is used alone.
In one possible embodiment, the thickness of the PEDOT PSS hole transport layer is 300-500 nm.
In the technical scheme, the thickness of the PEDOT/PSS hole transport layer is set to be 300-500 nm, so that the PEDOT/PSS hole transport layer has higher mobility, and the efficiency of the solar cell is improved.
In one possible embodiment, the first intrinsic amorphous silicon passivation layer has a thickness of 10 to 20nm, and the second intrinsic amorphous silicon passivation layer has a thickness of 5 to 10 nm.
In the technical scheme, the thickness setting is more favorable for improving the cell efficiency of the solar cell.
In one possible embodiment, the transparent conductor oxide layer is an indium tin oxide layer.
In the technical scheme, the indium tin oxide layer has better transparency and conductivity, and is more suitable for solar cells.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a silicon-based double-sided organic/inorganic heterojunction solar cell provided in an embodiment of the present application.
Icon: 100-silicon-based double-sided organic/inorganic heterojunction solar cells; 10-a positive metal electrode layer; 20-infiltrating an additive protective layer; 30-PEDOT PSS hole transport layer; 40-a first intrinsic amorphous silicon passivation layer; a 50-n type silicon substrate layer; 60-a second intrinsic amorphous silicon passivation layer; a 70-n type amorphous silicon doped layer; 80-transparent conductive oxide layer; 90-back metal electrode layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is noted that the terms "first", "second", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a silicon-based double-sided organic/inorganic heterojunction solar cell 100.
The silicon-based double-sided organic/inorganic heterojunction solar cell 100 comprises a positive metal electrode layer 10, a wetting additive protection layer 20, a PEDOT (power generation optical transport) PSS hole transport layer 30, a first intrinsic amorphous silicon passivation layer 40, an n-type silicon substrate layer 50, a second intrinsic amorphous silicon passivation layer 60, an n-type amorphous silicon doping layer 70, a transparent conductor oxidation layer 80 and a back metal electrode layer 90 which are sequentially stacked. It should be noted that the n-type silicon substrate layer 50 may be n-type polysilicon or n-type single crystal silicon. Illustratively, the thickness of the n-type silicon substrate layer 50 is 80-120 μm.
In addition, the material of the transparent conductor oxide layer 80 may be Indium Tin Oxide (ITO) or aluminum-doped zinc oxide (AZO).
The PEDOT/PSS hole transport layer 30 mainly comprises (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid), is used as a window layer of incident light of a solar cell, has adjustable energy band gap, can excite more photogenerated carriers, and reduces parasitic absorption of the incident light. And the PEDOT/PSS hole transport layer 30 has high mobility, can efficiently transport hole carriers, prevents the passage of electron carriers, plays a role in selective transport, and improves the efficiency of the solar cell. The PEDOT PSS hole transport layer 30 is typically 300-500 nm thick, and may be, for example, 300nm, 350nm, 400nm, 450nm, or 500 nm. The thickness enables the PEDOT PSS hole transport layer 30 to have higher mobility, and the efficiency of the solar cell is improved.
The wetting additive protective layer 20 can increase the wettability of the PEDOT/PSS hole transport layer 30 and the n-type silicon substrate layer 50, so that the PEDOT/PSS hole transport layer and the n-type silicon substrate layer are contacted more tightly and firmly, the contact resistance of a metal electrode is reduced, and the efficiency of the solar cell is improved.
In one possible embodiment, wetting additive protective layer 20 contains aluminum metal particles and a fluoride ion polymer. The fluorine ion polymer has chemical bonds and can increase the adhesion force of the PEDOT, the PSS hole transport layer 30 and the first intrinsic amorphous silicon passivation layer 40; in addition, the aluminum metal particles can increase the activity of the metal surface and increase the surface temperature, thereby being beneficial to increasing the pulling force of the screen printing low-temperature silver paste. Under the action of the wetting additive protective layer 20 containing aluminum metal particles and fluorine ion polymer, the PEDOT/PSS hole transport layer 30 is contacted with the n-type silicon substrate layer 50 more tightly and firmly, the contact resistance of a metal electrode is reduced, and the efficiency of the solar cell is improved. It should be noted that, as long as the wetting additive protection layer 20 contains aluminum metal particles and fluorine ion polymer, the efficiency of the solar cell can be improved. The specific ratio of the aluminum metal particles to the fluoride ion polymer is not limited in the embodiments of the present application.
Illustratively, the wetting additive protective layer 20 has a thickness of 10 to 30 μm. The thickness of the wetting additive protection layer 20 is set to be 10-30 mu m, so that the function of increasing the wettability of the PEDOT, PSS hole transport layer 30 and the n-type silicon substrate layer 50 can be well guaranteed, and the influence of too thick thickness on the cell efficiency of the solar cell can be avoided. Optionally, the wetting additive protective layer 20 has a thickness in a range of any one or between any two of 10 μm, 15 μm, 20 μm, 25 μm, and 30 μm.
Optionally, the aluminum metal particles have a particle size of 800 to 1000nm, such as any one of 800nm, 850nm, 900nm, 950nm, and 1000nm or a range between any two. The aluminum metal particles in the particle size range are more beneficial to increasing the activity of the metal surface, so that the PEDOT/PSS hole transport layer 30 is contacted with the n-type silicon substrate layer 50 more tightly and firmly, and the efficiency of the solar cell is improved.
Illustratively, the fluoride ion polymer is selected from hexafluoropropylene and polytetrafluoroethylene. The hexafluoropropylene and the polytetrafluoroethylene have chemical bonds and stronger acting force than molecules, and can better increase the adhesion force of the PEDOT, the PSS hole transport layer 30 and the first intrinsic amorphous silicon passivation layer 40.
Further, in one possible embodiment, both the positive metal electrode layer 10 and the back metal electrode layer 90 contain Cu. Such an arrangement allows the positive metal electrode layer 10 and the back metal electrode layer 90 to have good conductivity, and can increase the carrier collection rate. Illustratively, the positive metal electrode layer 10 and the back metal electrode layer 90 have a height of 20 to 30 μm and a width of 40 to 80 μm.
Optionally, the positive metal electrode layer 10 further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn, and Ag. These metal elements are used together with Cu, and compared with the use of Cu alone, the cost can be reduced, and the conductivity and the battery efficiency can be ensured.
Optionally, the back metal electrode layer 90 further contains at least one of Mo, W, Ti, Ni, Al, Mg, Ta, Sn, and Ag. These metal elements are used together with Cu, and compared with the use of Cu alone, the cost can be reduced, and the conductivity and the battery efficiency can be ensured.
To increase the open circuit voltage and cell efficiency of the solar cell, in one possible embodiment, the first and second intrinsic amorphous silicon passivation layers 40 and 60 are each SiH4And H2Is deposited as a gas source to obtain SiH4And H2The volume ratio of (A) to (B) is 2-4: 1. Illustratively, the Deposition method is a Plasma Enhanced Chemical Vapor Deposition (PECVD). Illustratively, the first intrinsic amorphous silicon passivation layer 40 has a thickness of 10 to 20nm, and the second intrinsic amorphous silicon passivation layer 60 has a thickness of 5 to 10 nm. Such a thickness setting is more advantageous for improving the cell efficiency of the solar cell.
The embodiment of the present application further provides a method for manufacturing a silicon-based double-sided organic/inorganic heterojunction solar cell 100, which includes:
(1) a first intrinsic amorphous silicon passivation layer 40 and a second intrinsic amorphous silicon passivation layer 60 are formed on opposite surfaces of the n-type silicon substrate layer 50, respectively.
Exemplarily, the n-type silicon substrate layer 50 is placed in a PECVD film preparation device, and SiH with the volume ratio of 2-4: 1 is introduced into the PECVD film preparation device4And H2Source of gas in n-typeThe first and second intrinsic amorphous silicon passivation layers 40 and 60 are deposited on opposite surfaces of the silicon substrate layer 50, respectively.
Illustratively, the n-type silicon substrate layer 50 is cleaned and textured prior to forming the first intrinsic amorphous silicon passivation layer 40 and the second intrinsic amorphous silicon passivation layer 60, wherein the n-type monocrystalline silicon substrate layer forms a surface textured structure pyramid shape on the n-type silicon substrate layer 50 using a NaOH solution, and the n-type polycrystalline silicon substrate layer forms a surface textured structure pyramid shape using HCl/HNO3The solution forms a surface textured structure pyramid shape on the n-type silicon substrate layer 50.
(2) Forming a PEDOT, PSS hole transport layer 30 on the surface of the first intrinsic amorphous silicon passivation layer 40; an n-type amorphous silicon doped layer 70 is formed on the surface of the second intrinsic amorphous silicon passivation layer 60.
Illustratively, the PEDOT: PSS hole transport layer 30 may be formed by spraying PEDOT: PSS onto the surface of the first intrinsic amorphous silicon passivation layer 40 using an inkjet device.
Illustratively, the PH will be3And SiH4And depositing a gas source on the surface of the second intrinsic amorphous silicon passivation layer 60 by PECVD equipment according to the ventilation ratio of 4:1 by volume ratio to form an n-type amorphous silicon doped layer 70.
(3) A wetting additive protection layer 20 is formed on the surface of the PEDOT/PSS hole transport layer 30, and a transparent conductive substance oxidation layer is formed on the surface of the n-type amorphous silicon doping layer 70.
Illustratively, the wetting additive may be sprayed on the surface of the PEDOT: PSS hole transport layer 30 by spraying to form the wetting additive protection layer 20.
Illustratively, a transparent conductor oxide layer may be formed on the surface of the n-type amorphous silicon doped layer 70 by magnetron sputtering.
(4) A positive metal electrode layer 10 is formed on the surface of the wetting additive protection layer 20, and a back metal electrode layer 90 is formed on the surface of the transparent conductive oxide layer.
Illustratively, both the positive metal electrode layer 10 and the back metal electrode layer 90 may be formed by screen printing.
The silicon-based double-sided organic/inorganic heterojunction solar cell 100 of the present application is described in further detail below with reference to examples.
Example 1
The embodiment of the application provides a silicon-based double-sided organic/inorganic heterojunction solar cell 100 which comprises a positive metal electrode layer 10, a wetting additive protection layer 20, a PEDOT (power system stabilizer) hole transport layer 30, a first intrinsic amorphous silicon passivation layer 40, an n-type silicon substrate layer 50, a second intrinsic amorphous silicon passivation layer 60, an n-type amorphous silicon doping layer 70, a transparent conductor oxidation layer 80 and a back metal electrode layer 90 which are sequentially stacked. The wetting additive protection layer 20 is 20 μm thick, and contains aluminum metal particles and hexafluoropropylene in a weight ratio of 1:3, wherein the aluminum metal particles have a particle size of 900 nm. In addition, the first and second intrinsic amorphous silicon passivation layers 40 and 60 are both made of SiH4And H2Is deposited as a gas source to obtain SiH4And H2Is 4: 1. The positive metal electrode and the back metal electrode are both Cu.
Example 2
This example is substantially the same in structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of example 1, except that the weight ratio of the aluminum metal particles to the hexafluoropropylene in example 2 is 3: 1.
Example 3
This embodiment has substantially the same structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of embodiment 1, except that the first intrinsic amorphous silicon passivation layer 40 and the second intrinsic amorphous silicon passivation layer 60 of embodiment 3 are both made of SiH4And H2Is deposited as a gas source to obtain SiH4And H2Is 2: 1.
Example 4
The present embodiment has substantially the same structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of embodiment 1, except that the positive metal electrode and the back metal electrode in embodiment 4 are both formed of Cu and Ti.
Example 5
The present embodiment has substantially the same structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of embodiment 1, except that the positive metal electrode and the back metal electrode in embodiment 5 are both formed of Cu and Al.
Comparative example 1
The solar cell of the present comparative example has substantially the same structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of example 1, except that comparative example 1 is not provided with the wetting additive protection layer 20.
Comparative example 2
The solar cell of this comparative example has substantially the same structure as the silicon-based double-sided organic/inorganic heterojunction solar cell 100 of example 1, and is different from the hole transport layer of comparative example 2 only in that Cadmium sulfide (hereinafter, referred to as Cadmium sulfide) is used as a raw material.
Test examples
The conversion efficiencies of the silicon-based double-sided organic/inorganic heterojunction solar cells 100 prepared in examples 1 to 5 and the solar cells prepared in comparative examples 1 to 2 were tested at 25 ℃ under the conditions of AM 1.5 and 1 standard sun using a halm online I-V test system, and the results are shown in table 1.
TABLE 1 test results of conversion efficiency of solar cells of examples 1 to 5 and comparative examples 1 to 2
Figure BDA0002391121600000091
Figure BDA0002391121600000101
As can be seen from the results in table 1, in example 1, the wetting additive protection layer 20 is provided more than in comparative example 1, and the cell efficiency is greatly improved. In addition, compared with the comparative example 2, the hole transport layer of the embodiment 1 adopts PEDOT and PSS hole transport layer 30, and the battery efficiency is greatly improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. A silicon-based double-sided organic/inorganic heterojunction solar cell is characterized by comprising a positive metal electrode layer, a wetting additive protection layer, PEDOT, a PSS hole transport layer, a first intrinsic amorphous silicon passivation layer, an n-type silicon substrate layer, a second intrinsic amorphous silicon passivation layer, an n-type amorphous silicon doping layer, a transparent conducting material oxidation layer and a back metal electrode layer which are sequentially stacked.
2. The silicon-based double-sided organic/inorganic heterojunction solar cell of claim 1, wherein the thickness of the wetting additive protection layer is 10-30 μm.
3. The silicon-based bifacial organic/inorganic heterojunction solar cell of claim 1, wherein both the positive metal electrode layer and the back metal electrode layer contain Cu.
4. The silicon-based double-sided organic/inorganic heterojunction solar cell of claim 1, wherein the thickness of the PEDOT/PSS hole transport layer is 300-500 nm.
5. The silicon-based double-sided organic/inorganic heterojunction solar cell of claim 1, wherein the thickness of the first intrinsic amorphous silicon passivation layer is 10-20 nm, and the thickness of the second intrinsic amorphous silicon passivation layer is 5-10 nm.
6. The silicon-based bifacial organic/inorganic heterojunction solar cell of claim 1, wherein said transparent conductor oxide layer is an indium tin oxide layer.
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