CN103668361B - A kind of preparation method of the copper and indium zinc selenium thin film of the photovoltaic cell for photovoltaic generating system - Google Patents

A kind of preparation method of the copper and indium zinc selenium thin film of the photovoltaic cell for photovoltaic generating system Download PDF

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CN103668361B
CN103668361B CN201310489974.6A CN201310489974A CN103668361B CN 103668361 B CN103668361 B CN 103668361B CN 201310489974 A CN201310489974 A CN 201310489974A CN 103668361 B CN103668361 B CN 103668361B
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thin film
preparation
copper
indium zinc
deposition
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CN103668361A (en
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裴玉杰
董军
***
张大霖
刘玉民
李颖
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Liaoning Electric Power Co Ltd
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Abstract

The preparation method that the present invention provides the copper and indium zinc selenium thin film of a kind of photovoltaic cell for photovoltaic generating system, does is each constituent content of copper, indium and selenium film Cu? 20.55-20.59%, In? 25.54-25.60%, Zn? 15.62-15.68%, Se? 38.10-38.19%, above-mentioned each component sum is 100%; Its preparation method is as follows: the 1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and adjustment pH value is 2.5-3.0; 2) electro-deposition of thin film: electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, and during electro-deposition, solution is without stirring, ambient operation; 3) selenization of thin film: selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium, with the ramp of 10-15 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling; 4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 15-20 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film. Above-mentioned preparation method not only can low cost, and operate simple and easy, be conducive to large area to produce and the exploitation of environmental requirement and photovoltaic energy.

Description

A kind of preparation method of the copper and indium zinc selenium thin film of the photovoltaic cell for photovoltaic generating system
Technical field
The present invention relates to Photovoltaic new energy technical field in the preparation of semiconductive thin film, particularly to the preparation method of the copper and indium zinc selenium thin film of a kind of photovoltaic cell for photovoltaic generating system.
Background technology
Photovoltaic generating system is a kind of energy conversion system directly converting the solar into electric energy, the theoretical basis of its opto-electronic conversion is the photovoltaic effect near semiconductor PN or semiconductor-metal interface, therefore solaode is otherwise known as photovoltaic cells, is called for short photovoltaic cell or light cell. Photovoltaic cell is developed so far, and can be largely classified into three major types, and one is the crystal silicon solar energy battery based on monocrystal silicon and polysilicon silicon chip; Two is silica-base film (amorphous, polycrystalline, crystallite etc.), CIS and cadmium telluride diaphragm solar battery, dye sensitization and other organic solar batteries; Three is still in novel solar batteries such as the SQW of conceptual phase, multipotency band, hot carriers. Current crystal silicon solar energy battery is occupied an leading position, and market share is about 90%, and thin-film solar cells market share only has about 10%.The core of thin-film solar cells is light absorbing zone and the heterojunction semiconductor of another semiconductor layer composition, the thin film such as light-absorption layer, Window layer and dorsum electrode layer organically combine, and substrate is glass or the flexible material of low cost. Owing to light absorbing zone is direct band-gap semicondictor, so the absorption coefficient of light is high, several microns of thickness just can absorb overwhelming majority sunlight, and therefore device gross thickness is smaller than 10 microns. It is also advantageous in that solar energy in large area battery module can entirety be made, and does not need to assemble. Material owing to needing is few, and compared with silion cell, production cost has substantial degradation space.
The thin-film solar cells of China starts from the eighties, wherein copper and indium (gallium) selenium CI (G) S solaode due to transformation efficiency be in thin-film solar cells the highest, and have that band gap is adjustable, radiation resistance good, production process environmental protection, to constituent content nonstoichiometry than tolerance advantages of higher, thus in recent years under the superperformance of copper and indium (gallium) Se solar cell and broad prospect of application, many scientific research institutions and company proceed by research and the production of CIGS solaode. Such as Guangxi Di Kai limited company and Tsing-Hua University's R & D Cooperation CIGS solaode. Blue star company of Weihai in Shandong province has introduced two conversion ratios manufacture of solar cells line more than 8% from TETTASOLAR company of the U.S.. Safe and sound company also contracts in German company, the technology of CIS solaode is prepared in joint development electro-deposition, Shandong Fu limited company has introduced the CIGSSe thin film solar cell technologies of the JOHANNASOLAR of Germany, has built up extensive battery production base.
Copper and indium (gallium) selenium material is the direct band-gap semicondictor of a kind of yellow copper structure, and under room temperature, energy gap is 1.04eV, owing to it has high photoelectric transformation efficiency (18%) and the absorption coefficient of light (α > 10-5cm-1), capability of resistance to radiation is strong, is one of best photovoltaic semiconductors material of absorbent properties known today. Along with the development of solaode industry, CIS (CuInSe2) research be also affected by increasingly focusing on, it is believed that be the important component part of thin-film solar cells, used the aspect such as solaode and some light-sensitive elements both at home and abroad at present.
Summary of the invention
The preparation method of photovoltaic cell thin film is varied, such as methods such as chemical vapour deposition (CVD), SILAR method (SILAR), electrochemical depositions. In these methods, magnetron sputtering technique comparative maturity, but due to appointed condition reason, make the method at preparation large area CuInSe2Thin film aspect is restricted, and relatively costly. Chemical vapour deposition (CVD), SILAR method prepare CuInSe2Thin film has bibliographical information, but all haves much room for improvement in large area preparation and film quality control etc. Electrochemical deposition rule adopts the method for electro-deposition and selenium (sulfur) annealing to prepare high-quality CIGS polycrystal film on the substrate of plating molybdenum electrode. But it is complicated all to there is equipment in various degree in said method, complex operation, and production cost is high, is unfavorable for large-scale production, is unsatisfactory for environmental requirement simultaneously.
The preparation method that it is an object of the invention to provide a kind of copper and indium zinc selenium thin film for photovoltaic cell, not only low cost can prepare copper and indium zinc selenium thin film, and operate simple and easy, is conducive to large area to produce the exploitation with environmental requirement and photovoltaic energy. For achieving the above object, the technical solution used in the present invention is the preparation method of a kind of copper and indium zinc selenium thin film for photovoltaic cell, each constituent content of copper, indium and selenium film is Cu20.55-20.59%, In25.54-25.60%, Zn15.62-15.68%, Se38.10-38.19%, above-mentioned each component sum is 100%;
Its preparation method is as follows:
1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and adjustment pH value is 2.5-3.0;
2) electro-deposition of thin film: electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, and during electro-deposition, solution is without stirring, ambient operation;
3) selenization of thin film: selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium, with the ramp of 10-15 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling;
4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 15-20 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film.
Material added by described electric depositing solution and concentration thereof is: the CuCl of 0.02-0.025mol/L2, 0.05-0.055mol/L InCl3, 0.025-0.03mol/L ZnCl2, the citric acid of 0.8-0.85mol/L, 0.05-0.06mol/L LiCl.
Described electro-deposition is to be placed in container of electrodeposition by the solution of described preparation, is platinized and titanized anode to electrode, and reference electrode is silver/silver chloride electrode, and working electrode is Copper Foil, and area is 3cm × 3cm.
Described selenization also includes the step that noble gas passes into the air displaced in selenizing stove in stove.
The present invention compared with prior art, 1) accurately control each constituent content of thin film, and with the addition of the zinc element Substitute For Partial phosphide element that reserves are abundant and cost is low, not only ensure film performance but also production cost can be reduced;
2) conventional selenization adopts H2Se gas, the present invention adopts solid-state selenium to instead of the H of severe toxicity2Se gas, more environmentally-friendly;
3) after electro-deposition, thin film is carried out heat treatment, further ensure quality and the crystal form of thin film;
4) equipment is simple, and reaction condition is gentle;
5) preparation parameter can be readily changed by change the correlated performance of thin film, such as energy gap, be actually needed to meet.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of the copper and indium zinc selenium thin film of photovoltaic cell.
Fig. 2 CuInZnSe photovoltaic cell structure schematic diagram.
Detailed description of the invention
Embodiment 1:
Each constituent content of copper and indium zinc selenium thin film is Cu20.58%, In25.57%, Zn15.66%, Se38.19%. Its step is as follows:
1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and added material and concentration thereof is: the CuCl of 0.02mol/L2, 0.05mol/L InCl3, 0.025mol/L ZnCl2, the citric acid of 0.8mol/L, 0.05mol/L LiCl, adjust pH value be 2.5;
2) electro-deposition of thin film: the solution of above-mentioned preparation is placed in container of electrodeposition, it is platinized and titanized anode to electrode, reference electrode is silver/silver chloride electrode, working electrode is Copper Foil, and area is 3cm*3cm, and electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, during electro-deposition, solution is without stirring, ambient operation;
3) selenization of thin film: noble gas is passed into the air displacing in stove in selenizing stove, selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium afterwards, and with the ramp of 12 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling;
4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 20 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film.
Embodiment 2:
Each constituent content of copper and indium zinc selenium thin film is Cu20.59%, In25.60%, Zn15.62%, Se38.19%, and its step is as follows:
1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and added material and concentration thereof is: the CuCl of 0.023mol/L2, 0.053mol/L InCl3, 0.028mol/L ZnCl2, the citric acid of 0.84mol/L, 0.056mol/L LiCl, adjust pH value be 2.8;2) electro-deposition of thin film: the solution of above-mentioned preparation is placed in container of electrodeposition, it is platinized and titanized anode to electrode, reference electrode is silver/silver chloride electrode, working electrode is Copper Foil, and area is 3cm*3cm, and electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, during electro-deposition, solution is without stirring, ambient operation; 3) selenization of thin film: noble gas is passed into the air displacing in stove in selenizing stove, selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium afterwards, and with the ramp of 15 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling; 4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 15 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film.
Embodiment 3:
Each constituent content of copper and indium zinc selenium thin film is Cu20.57%, In25.57%, Zn15.64%, Se38.22%, and its step is as follows:
1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and added material and concentration thereof is: the CuCl of 0.025mol/L2, 0.055mol/L InCl3, 0.03mol/L ZnCl2, the citric acid of 0.85mol/L, 0.06mol/L LiCl, adjust pH value be 3.0; 2) electro-deposition of thin film: the solution of above-mentioned preparation is placed in container of electrodeposition, it is platinized and titanized anode to electrode, reference electrode is silver/silver chloride electrode, working electrode is Copper Foil, and area is 3cm*3cm, and electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, during electro-deposition, solution is without stirring, ambient operation; 3) selenization of thin film: noble gas is passed into the air displacing in stove in selenizing stove, selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium afterwards, and with the ramp of 12 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling; 4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 18 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film.

Claims (3)

1. the preparation method for the copper and indium zinc selenium thin film of the photovoltaic cell of photovoltaic generating system, it is characterized in that, each constituent content of described copper and indium zinc selenium thin film is Cu20.55-20.59%, In25.54-25.60%, Zn15.62-15.68%, Se38.10-38.19%, above-mentioned each component sum is 100%;
Its preparation method is as follows:
1) preparation of electric depositing solution: electric depositing solution is prepared with deionized water at normal temperatures, and adjustment pH value is 2.5-3.0;
2) electro-deposition of thin film: electro-deposition adopts constant potential-1.0V, solution temperature 25 DEG C, sedimentation time 30min, and during electro-deposition, solution is without stirring, ambient operation;
3) selenization of thin film: selenizing stove put into by the molybdenum box by thin film with equipped with 3g solid selenium, with the ramp of 10-15 DEG C/min to 450 DEG C, the selenizing time is 1h, afterwards furnace cooling;
4) heat treatment of thin film: first heat treatment 10min under 350 DEG C of constant temperature, afterwards with the ramp of 15-20 DEG C/min to 550 DEG C, is incubated 50min, final prepared copper and indium zinc selenium thin film;
Material added by described electric depositing solution and concentration thereof is: the CuCl of 0.02-0.025mol/L2, 0.05-0.055mol/L InCl3, 0.025-0.03mol/L ZnCl2, the citric acid of 0.8-0.85mol/L, 0.05-0.06mol/L LiCl.
2. the preparation method of copper and indium zinc selenium thin film as claimed in claim 1, it is characterized in that described electro-deposition is to be placed in container of electrodeposition by the solution of described preparation, be platinized and titanized anode to electrode, reference electrode is silver/silver chloride electrode, working electrode is Copper Foil, and area is 3cm × 3cm.
3. the preparation method of copper and indium zinc selenium thin film as claimed in claim 1, it is characterised in that described selenization also includes the step that noble gas passes into the air displaced in selenizing stove in stove.
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CN109065722B (en) * 2018-07-12 2020-12-01 西南大学 Solar cell based on hot carriers and preparation method thereof
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