CN108831955A - A kind of silicon solar cell and preparation method thereof - Google Patents

A kind of silicon solar cell and preparation method thereof Download PDF

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CN108831955A
CN108831955A CN201810586050.0A CN201810586050A CN108831955A CN 108831955 A CN108831955 A CN 108831955A CN 201810586050 A CN201810586050 A CN 201810586050A CN 108831955 A CN108831955 A CN 108831955A
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type silicon
silicon chip
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CN108831955B (en
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张军
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Nantong Construction Engineering Co.,Ltd.
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Suzhou Bao Lan Environmental Protection & Technology Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/1804Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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    • H01L31/0352Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
    • H01L31/035209Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions comprising a quantum structures
    • H01L31/035227Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions comprising a quantum structures the quantum structure being quantum wires, or nanorods
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    • Y02E10/547Monocrystalline silicon PV cells
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Abstract

The present invention relates to a kind of silicon solar cell and preparation method thereof, the silicon solar cell includes rear electrode, backside passivation layer, n type single crystal silicon piece, silicon nanowire array, upper surface passivation layer, Spiro-OMeTAD/ CuPc composite layer, PEDOT from bottom to up:PSS layer and positive gate electrode, the PEDOT:PSS layer contains magnesium elements, by the specific process parameter of optimization silicon solar battery structure and each layer, so that silicon solar cell of the invention has excellent photoelectric conversion efficiency.

Description

A kind of silicon solar cell and preparation method thereof
Technical field
The present invention relates to technical field of solar batteries, more particularly to a kind of silicon solar cell and preparation method thereof.
Background technique
Single crystal silicon solar cell can not be widely applied because its cost is prohibitively expensive, though and organic solar batteries So cost is relatively low, however the efficiency of organic solar batteries is far below inorganic solar cell, can not be also widely applied.? On the basis of this, people increasingly pay close attention to the development process of hybrid inorganic-organic solar battery, hybrid inorganic-organic solar energy Battery can avoid respective defect, in conjunction with the advantage of organic material and inorganic material to obtain higher photoelectric conversion efficiency. Existing Si/PEDOT:The photoelectric conversion efficiency of PSS hybrid inorganic-organic solar battery needs further 10% or so Improve the internal structure of hybrid inorganic-organic solar battery, to improve its photoelectric conversion efficiency.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of silicon solar cell and its preparation side are provided Method.
To achieve the above object, the preparation method of a kind of silicon solar cell proposed by the present invention, includes the following steps:
1) cleaning of N-type silicon chip;
2) silicon nanowire array is prepared on the surface of N-type silicon chip;
3) methylation processing is carried out to the N-type silicon chip that the step 2 obtains;
4) then contain oacetic acid aluminum-diisopropoxide and isopropanol hafnium in the upper surface spin coating of the N-type silicon chip Organic solution, and be heat-treated, further it is passivated the upper surface of the N-type silicon chip;
5) preparation of Spiro-OMeTAD/ CuPc composite layer:The N-type silicon chip that the step 4 obtains front successively Spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc carry out first time annealing, then to form the Spiro-OMeTAD/ CuPc composite layer;
6)PEDOT:The preparation of PSS layer:In PEDOT:A certain amount of magnesium chloride is added in PSS aqueous solution, to be formed PEDOT:PSS mixed solution, the PEDOT described in the positive spin coating for the N-type silicon chip that the step 5 obtains:PSS mixed solution, and It carries out second to make annealing treatment, to form the PEDOT:PSS modified layer;
7) back side of the N-type silicon chip obtained in the step 6 prepares an alumina flake using atomic layer deposition method, In, the rate of deposition of aluminium oxide is 1-2 Ethylmercurichlorendimide/period, and the periodicity of deposition is 3-5;
8) preparation of positive gate electrode;
9) preparation of rear electrode.
The preparation method of silicon solar cell as above further in the step (2), by wet etching or is done Method etching prepares silicon nanowire array on the surface of N-type silicon chip, the length of the single silicon nanowires in the silicon nanowire array It is 1.5-2 microns, the diameter of the silicon nanowires is 300-500 nanometers, and the spacing of adjacent silicon nanowires is 400-800 nanometers.
The preparation method of silicon solar cell as above further in the step (3), first obtains step (2) N-type silicon chip immerse in the chlorobenzene solution of saturation phosphorus pentachloride, impregnate 1-2 hours at 120 DEG C, then by the N-type silicon chip from It is taken out in the chlorobenzene solution of the saturation phosphorus pentachloride, then which is placed in the tetrahydro furan of 1mol/L methyl-magnesium-chloride It mutters in solution, is impregnated 6-9 hours at 85 DEG C, to form Si-CH on the surface of the N-type silicon chip3Key, to be passivated the N-type Silicon wafer.
The preparation method of silicon solar cell as above, it is further, described to contain ethyl in the step (4) The concentration of oacetic acid aluminum-diisopropoxide described in acetic acid aluminum-diisopropoxide and the organic solution of isopropanol hafnium is 0.3- 0.6mg/ml, the concentration of the isopropanol hafnium are 0.3-0.6mg/ml, and the revolving speed of spin coating is 4000-5000 revs/min, spin coating Time is 1-3 minutes, 200-300 DEG C of the temperature of the heat treatment, and the time of the heat treatment is 10-20 minutes.
The preparation method of silicon solar cell as above, further, in the step (5), the Spiro-OMeTAD The revolving speed of the concentration 2-4mg/ml of solution, Spiro-OMeTAD solution described in each spin coating are 1500-2500 revs/min, often The time of Spiro-OMeTAD solution described in secondary spin coating is 1-3 minutes, and the rate of each thermal evaporation CuPc is 1-2 angstroms Meter per second, the time of each thermal evaporation CuPc are 3-6 seconds, and the annealing temperature of the first time annealing is 100-110 DEG C, the annealing time of the first time annealing is 15-25 minutes.
The preparation method of silicon solar cell as above, further, in the step (6), PEDOT:PSS mixed solution In the concentration of magnesium chloride be 0.05-0.5mg/ml, PEDOT described in spin coating:The revolving speed of PSS mixed solution be 1800-2500 turn/ Minute, PEDOT described in spin coating:The time of PSS mixed solution is 2-5 minutes, and the annealing temperature of second of annealing is 110-130 DEG C, the annealing time of second of annealing is 20-30 minutes.
The preparation method of silicon solar cell as above further in the step (8), passes through hot evaporation metallic silver Form the positive gate electrode, the positive gate electrode with a thickness of 180-260 nanometers.
The preparation method of silicon solar cell as above further in the step (9), passes through hot evaporation metallic aluminium Form the rear electrode, the rear electrode with a thickness of 200-300 nanometers.
The present invention also proposes a kind of silicon solar cell, uses the above method to prepare to be formed.
The present invention has following advantages compared with prior art:
To be passivated silicon face, then in the preparation process of silicon solar cell of the invention, methylation processing is carried out first Spin coating contains the organic solution of oacetic acid aluminum-diisopropoxide and isopropanol hafnium, and is further passivated silicon table by heat treatment Face effectively reduces the defect state of silicon face by two step passivation process;It is initially formed on silicon nanowire array surface Spiro-OMeTAD/ CuPc composite layer re-forms PEDOT:PSS layer is effectively kept away with obtaining the organic compound film of high quality The top for exempting from silicon nanowires is exposed to PEDOT:PSS layer, ultra-thin Spiro-OMeTAD/ CuPc composite layer improve silicon nanometer Line and PEDOT:Contact berrier between PSS layer, while PEDOT:PSS layer contains magnesium elements and further improves built in field, N The back side of type silicon wafer is prepared with a ultra-thin alumina flake, has effectively been passivated the back side of silicon wafer, the phase interworking of above-mentioned each structure It closes, and then imitates the photoelectric conversion efficiency for improving silicon solar cell of the invention.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of silicon solar cell of the invention.
Specific embodiment
As shown in Figure 1, the present invention proposes that a kind of silicon solar cell, the silicon solar cell include the back side from bottom to up Electrode 1, backside passivation layer 2, n type single crystal silicon piece 3, silicon nanowire array 4, upper surface passivation layer 5, Spiro-OMeTAD/ phthalocyanine Copper composite layer 6, PEDOT:PSS layer 7 and positive gate electrode 8.
The present invention also proposes the preparation method of above-mentioned silicon solar cell, includes the following steps:
1) cleaning of N-type silicon chip;
2) silicon nanowire array is prepared on the surface of N-type silicon chip, by wet etching or is dry-etched in the table of N-type silicon chip Wheat flour is for silicon nanowire array, and the length of the single silicon nanowires in the silicon nanowire array is 1.5-2 microns, and the silicon is received The diameter of rice noodles is 300-500 nanometers, and the spacing of adjacent silicon nanowires is 400-800 nanometers;
3) methylation processing is carried out to the N-type silicon chip that the step 2 obtains, the N-type silicon chip for first obtaining step (2) is soaked Enter to be saturated in the chlorobenzene solution of phosphorus pentachloride, be impregnated at 120 DEG C 1-2 hours, it is then that the N-type silicon chip is phosphoric from the saturation It takes out, is then placed in the N-type silicon chip in the tetrahydrofuran solution of 1mol/L methyl-magnesium-chloride, 85 in the chlorobenzene solution of phosphorus It is impregnated 6-9 hours at DEG C, to form Si-CH on the surface of the N-type silicon chip3Key, to be passivated the N-type silicon chip;
4) then contain oacetic acid aluminum-diisopropoxide and isopropanol hafnium in the upper surface spin coating of the N-type silicon chip Organic solution, and be heat-treated, further it is passivated the upper surface of the N-type silicon chip, wherein described to contain oacetic acid The concentration of oacetic acid aluminum-diisopropoxide described in aluminum-diisopropoxide and the organic solution of isopropanol hafnium is 0.3-0.6mg/ Ml, the concentration of the isopropanol hafnium are 0.3-0.6mg/ml, and the revolving speed of spin coating is 4000-5000 revs/min, and the time of spin coating is 1-3 minutes, 200-300 DEG C of the temperature of the heat treatment, the time of the heat treatment was 10-20 minutes;
5) preparation of Spiro-OMeTAD/ CuPc composite layer:The N-type silicon chip that the step 4 obtains front successively Spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc carry out first time annealing, then to form the Spiro-OMeTAD/ CuPc composite layer, wherein the concentration 2-4mg/ml of the Spiro-OMeTAD solution, Spiro-OMeTAD described in each spin coating The revolving speed of solution is 1500-2500 revs/min, and the time of Spiro-OMeTAD solution described in each spin coating is 1-3 minutes, The rate of each thermal evaporation CuPc is 1-2 angstroms of meter per second, and the time of each thermal evaporation CuPc is 3-6 seconds, and described first The annealing temperature of secondary annealing is 100-110 DEG C, and the annealing time of the first time annealing is 15-25 minutes;
6)PEDOT:The preparation of PSS layer:In PEDOT:A certain amount of magnesium chloride is added in PSS aqueous solution, to be formed PEDOT:PSS mixed solution, the PEDOT described in the positive spin coating for the N-type silicon chip that the step 5 obtains:PSS mixed solution, and It carries out second to make annealing treatment, to form the PEDOT:PSS modified layer, wherein PEDOT:Magnesium chloride in PSS mixed solution Concentration be 0.05-0.5mg/ml, PEDOT described in spin coating:The revolving speed of PSS mixed solution is 1800-2500 revs/min, spin coating The PEDOT:The time of PSS mixed solution is 2-5 minutes, and the annealing temperature of second of annealing is 110-130 DEG C, The annealing time of second of annealing is 20-30 minutes;
7) back side of the N-type silicon chip obtained in the step 6 prepares an alumina flake using atomic layer deposition method, In, the rate of deposition of aluminium oxide is 1-2 Ethylmercurichlorendimide/period, and the periodicity of deposition is 3-5;
8) preparation of positive gate electrode forms the positive gate electrode, the positive gate electrode by hot evaporation metallic silver With a thickness of 180-260 nanometers;
9) preparation of rear electrode forms the rear electrode, the thickness of the rear electrode by hot evaporation metallic aluminium It is 200-300 nanometers.
Embodiment 1:
The present invention also proposes the preparation method of above-mentioned silicon solar cell, includes the following steps:
1) cleaning of N-type silicon chip;
2) silicon nanowire array is prepared on the surface of N-type silicon chip, by wet etching or is dry-etched in the table of N-type silicon chip Wheat flour is for silicon nanowire array, and the length of the single silicon nanowires in the silicon nanowire array is 1.8 microns, the silicon nanometer The diameter of line is 400 nanometers, and the spacing of adjacent silicon nanowires is 600 nanometers;
3) methylation processing is carried out to the N-type silicon chip that the step 2 obtains, the N-type silicon chip for first obtaining step (2) is soaked Enter to be saturated in the chlorobenzene solution of phosphorus pentachloride, be impregnated at 120 DEG C 1.5 hours, it is then that the N-type silicon chip is phosphoric from the saturation It takes out, is then placed in the N-type silicon chip in the tetrahydrofuran solution of 1mol/L methyl-magnesium-chloride, 85 in the chlorobenzene solution of phosphorus It is impregnated 8 hours at DEG C, to form Si-CH on the surface of the N-type silicon chip3Key, to be passivated the N-type silicon chip;
4) then contain oacetic acid aluminum-diisopropoxide and isopropanol hafnium in the upper surface spin coating of the N-type silicon chip Organic solution, and be heat-treated, further it is passivated the upper surface of the N-type silicon chip, wherein described to contain oacetic acid The concentration of oacetic acid aluminum-diisopropoxide described in aluminum-diisopropoxide and the organic solution of isopropanol hafnium is 0.5mg/ml, institute The concentration for stating isopropanol hafnium is 0.5mg/ml, and the revolving speed of spin coating is 4500 revs/min, and the time of spin coating is 2 minutes, at the heat 240 DEG C of the temperature of reason, the time of the heat treatment are 18 minutes;
5) preparation of Spiro-OMeTAD/ CuPc composite layer:The N-type silicon chip that the step 4 obtains front successively Spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc carry out first time annealing, then to form the Spiro-OMeTAD/ CuPc composite layer, wherein the concentration 3mg/ml of the Spiro-OMeTAD solution, Spiro-OMeTAD described in each spin coating are molten The revolving speed of liquid is 2200 revs/min, and the time of Spiro-OMeTAD solution described in each spin coating is 2 minutes, and heat is steamed every time The rate for sending out CuPc is 1.8 angstroms of meter per seconds, and the time of each thermal evaporation CuPc is 5 seconds, the first time annealing Annealing temperature be 105 DEG C, the annealing time of first time annealing is 20 minutes;
6)PEDOT:The preparation of PSS layer:In PEDOT:A certain amount of magnesium chloride is added in PSS aqueous solution, to be formed PEDOT:PSS mixed solution, the PEDOT described in the positive spin coating for the N-type silicon chip that the step 5 obtains:PSS mixed solution, and It carries out second to make annealing treatment, to form the PEDOT:PSS modified layer, wherein PEDOT:Magnesium chloride in PSS mixed solution Concentration be 0.25mg/ml, PEDOT described in spin coating:The revolving speed of PSS mixed solution is 2200 revs/min, PEDOT described in spin coating: The time of PSS mixed solution is 3 minutes, and the annealing temperature of second of annealing is 125 DEG C, at second of the annealing The annealing time of reason is 25 minutes;
7) back side of the N-type silicon chip obtained in the step 6 prepares an alumina flake using atomic layer deposition method, In, the rate of deposition of aluminium oxide is 1.5 Ethylmercurichlorendimides/period, and the periodicity of deposition is 4;
8) preparation of positive gate electrode forms the positive gate electrode, the positive gate electrode by hot evaporation metallic silver With a thickness of 220 nanometers;
9) preparation of rear electrode forms the rear electrode, the thickness of the rear electrode by hot evaporation metallic aluminium It is 260 nanometers.
The open-circuit voltage of the silicon solar cell of above method preparation is 0.62V, short circuit current 34.2mA/cm2, filling The factor is 0.75, photoelectric conversion efficiency 15.9%.
Embodiment 2
The present invention also proposes the preparation method of above-mentioned silicon solar cell, includes the following steps:
1) cleaning of N-type silicon chip;
2) silicon nanowire array is prepared on the surface of N-type silicon chip, by wet etching or is dry-etched in the table of N-type silicon chip Wheat flour is for silicon nanowire array, and the length of the single silicon nanowires in the silicon nanowire array is 1.5 microns, the silicon nanometer The diameter of line is 300 nanometers, and the spacing of adjacent silicon nanowires is 500 nanometers;
3) methylation processing is carried out to the N-type silicon chip that the step 2 obtains, the N-type silicon chip for first obtaining step (2) is soaked Enter to be saturated in the chlorobenzene solution of phosphorus pentachloride, impregnate 2 hours at 120 DEG C, then by the N-type silicon chip from the saturation phosphorus pentachloride Chlorobenzene solution in take out, then the N-type silicon chip is placed in the tetrahydrofuran solution of 1mol/L methyl-magnesium-chloride, at 85 DEG C It is lower to impregnate 9 hours, to form Si-CH on the surface of the N-type silicon chip3Key, to be passivated the N-type silicon chip;
4) then contain oacetic acid aluminum-diisopropoxide and isopropanol hafnium in the upper surface spin coating of the N-type silicon chip Organic solution, and be heat-treated, further it is passivated the upper surface of the N-type silicon chip, wherein described to contain oacetic acid The concentration of oacetic acid aluminum-diisopropoxide described in aluminum-diisopropoxide and the organic solution of isopropanol hafnium is 0.4mg/ml, institute The concentration for stating isopropanol hafnium is 0.5mg/ml, and the revolving speed of spin coating is 4000 revs/min, and the time of spin coating is 3 minutes, at the heat 280 DEG C of the temperature of reason, the time of the heat treatment are 20 minutes;
5) preparation of Spiro-OMeTAD/ CuPc composite layer:The N-type silicon chip that the step 4 obtains front successively Spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc carry out first time annealing, then to form the Spiro-OMeTAD/ CuPc composite layer, wherein the concentration 2mg/ml of the Spiro-OMeTAD solution, Spiro-OMeTAD described in each spin coating are molten The revolving speed of liquid is 1800 revs/min, and the time of Spiro-OMeTAD solution described in each spin coating is 3 minutes, and heat is steamed every time The rate for sending out CuPc is 1 angstrom of meter per second, and the time of each thermal evaporation CuPc is 6 seconds, the first time annealing Annealing temperature is 110 DEG C, and the annealing time of the first time annealing is 15 minutes;
6)PEDOT:The preparation of PSS layer:In PEDOT:A certain amount of magnesium chloride is added in PSS aqueous solution, to be formed PEDOT:PSS mixed solution, the PEDOT described in the positive spin coating for the N-type silicon chip that the step 5 obtains:PSS mixed solution, and It carries out second to make annealing treatment, to form the PEDOT:PSS modified layer, wherein PEDOT:Magnesium chloride in PSS mixed solution Concentration be 0.1mg/ml, PEDOT described in spin coating:The revolving speed of PSS mixed solution is 2500 revs/min, PEDOT described in spin coating: The time of PSS mixed solution is 4 minutes, and the annealing temperature of second of annealing is 110 DEG C, at second of the annealing The annealing time of reason is 30 minutes;
7) back side of the N-type silicon chip obtained in the step 6 prepares an alumina flake using atomic layer deposition method, In, the rate of deposition of aluminium oxide is 2 Ethylmercurichlorendimides/period, and the periodicity of deposition is 5;
8) preparation of positive gate electrode forms the positive gate electrode, the positive gate electrode by hot evaporation metallic silver With a thickness of 200 nanometers;
9) preparation of rear electrode forms the rear electrode, the thickness of the rear electrode by hot evaporation metallic aluminium It is 250 nanometers.
The open-circuit voltage of the silicon solar cell of above method preparation is 0.61V, short circuit current 33.8mA/cm2, filling The factor is 0.73, photoelectric conversion efficiency 15.05%.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as Protection scope of the present invention.

Claims (9)

1. a kind of preparation method of silicon solar cell, it is characterised in that:Include the following steps:
1) cleaning of N-type silicon chip;
2) silicon nanowire array is prepared on the surface of N-type silicon chip;
3) methylation processing is carried out to the N-type silicon chip that the step 2 obtains;
4) then contain the organic of oacetic acid aluminum-diisopropoxide and isopropanol hafnium in the upper surface spin coating of the N-type silicon chip Solution, and be heat-treated, further it is passivated the upper surface of the N-type silicon chip;
5) preparation of Spiro-OMeTAD/ CuPc composite layer:In the positive successively spin coating for the N-type silicon chip that the step 4 obtains Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro-OMeTAD solution, thermal evaporation CuPc, spin coating Spiro- OMeTAD solution, thermal evaporation CuPc carry out first time annealing, then to form the Spiro-OMeTAD/ CuPc Composite layer;
6)PEDOT:The preparation of PSS layer:In PEDOT:A certain amount of magnesium chloride is added in PSS aqueous solution, to form PEDOT:PSS Mixed solution, the PEDOT described in the positive spin coating for the N-type silicon chip that the step 5 obtains:PSS mixed solution, and carry out second Annealing, to form the PEDOT:PSS modified layer;
7) back side of the N-type silicon chip obtained in the step 6 prepares an alumina flake using atomic layer deposition method, wherein heavy The rate of product aluminium oxide is 1-2 Ethylmercurichlorendimide/period, and the periodicity of deposition is 3-5;
8) preparation of positive gate electrode;
9) preparation of rear electrode.
2. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (2), lead to It crosses wet etching or is dry-etched in the surface of N-type silicon chip and prepare silicon nanowire array, it is single in the silicon nanowire array The length of silicon nanowires is 1.5-2 microns, and the diameter of the silicon nanowires is 300-500 nanometers, the spacing of adjacent silicon nanowires It is 400-800 nanometers.
3. the preparation method of silicon solar cell according to claim 1, it is characterised in that:It is first in the step (3) The N-type silicon chip that first step (2) is obtained immerses in the chlorobenzene solution of saturation phosphorus pentachloride, impregnates 1-2 hours, connects at 120 DEG C The N-type silicon chip is taken out from the chlorobenzene solution of the saturation phosphorus pentachloride, the N-type silicon chip is then placed in 1mol/L methyl It in the tetrahydrofuran solution of magnesium chloride, is impregnated 6-9 hours at 85 DEG C, to form Si-CH on the surface of the N-type silicon chip3Key, To be passivated the N-type silicon chip.
4. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (4), institute State oacetic acid aluminum-diisopropoxide described in the organic solution containing oacetic acid aluminum-diisopropoxide and isopropanol hafnium Concentration be 0.3-0.6mg/ml, the concentration of the isopropanol hafnium is 0.3-0.6mg/ml, and the revolving speed of spin coating is 4000-5000 Rev/min, the time of spin coating is 1-3 minutes, 200-300 DEG C of the temperature of the heat treatment, and the time of the heat treatment is 10-20 Minute.
5. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (5), institute The concentration 2-4mg/ml of Spiro-OMeTAD solution is stated, the revolving speed of Spiro-OMeTAD solution described in each spin coating is 1500- 2500 revs/min, the time of Spiro-OMeTAD solution described in each spin coating is 1-3 minutes, each thermal evaporation CuPc Rate is 1-2 angstroms of meter per second, and the time of each thermal evaporation CuPc is 3-6 seconds, the annealing temperature of the first time annealing Degree is 100-110 DEG C, and the annealing time of the first time annealing is 15-25 minutes.
6. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (6), PEDOT:The concentration of magnesium chloride in PSS mixed solution is 0.05-0.5mg/ml, PEDOT described in spin coating:PSS mixed solution Revolving speed is 1800-2500 revs/min, PEDOT described in spin coating:The time of PSS mixed solution is 2-5 minutes, described to move back for the second time The annealing temperature of fire processing is 110-130 DEG C, and the annealing time of second of annealing is 20-30 minutes.
7. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (8), lead to Overheat evaporation metal silver forms the positive gate electrode, the positive gate electrode with a thickness of 180-260 nanometers.
8. the preparation method of silicon solar cell according to claim 1, it is characterised in that:In the step (9), lead to Overheat evaporation metal aluminium forms the rear electrode, the rear electrode with a thickness of 200-300 nanometers.
9. a kind of silicon solar cell, which is characterized in that prepare using the described in any item methods of claim 1-8 to be formed.
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