CN101478015A - Light splitting manufacturing process for four-junction solar cell system - Google Patents

Light splitting manufacturing process for four-junction solar cell system Download PDF

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Publication number
CN101478015A
CN101478015A CNA2008102431266A CN200810243126A CN101478015A CN 101478015 A CN101478015 A CN 101478015A CN A2008102431266 A CNA2008102431266 A CN A2008102431266A CN 200810243126 A CN200810243126 A CN 200810243126A CN 101478015 A CN101478015 A CN 101478015A
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solar cell
spectrum
solar
junction
manufacture method
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陆书龙
杨辉
董建荣
石林
熊康林
王亦
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Suzhou Institute of Nano Tech and Nano Bionics of CAS
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Suzhou Institute of Nano Tech and Nano Bionics of CAS
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention discloses the fabrication method of a four-junction solar battery system. The method is characterized in that the solar spectrum is divided into a high-energy region and a low-energy region by a spectrum-dividing device; a single-junction structure is adopted in the high-energy region to match the spectrum in the high-energy region; and a three-junction tandem structure is adopted in the low-energy region to match the spectrum in the low-energy region, so as to achieve absorption and conversion of solar full-spectrum energy. By adopting the spectrum-dividing device and the three-plus-one structure, the battery system can absorb and utilize energy of solar spectral bands matched with the band gap width of the material, thereby reducing thermal loss during photoelectrical conversion, maximally achieving solar full-spectrum absorption and energy conversion and achieving photoelectrical conversion efficiency. The solar battery system can obviate low cost resulting from the adoption of a plurality of different substrates in a mechanical tandem solar battery system, and can effectively solve the problem of lattice mismatch during the growth of single four-junction tandem semiconductor battery material.

Description

The light splitting manufacturing process of four-junction solar cell system
Technical field
The present invention relates to the photovoltaic technology field that solar energy utilizes, relate in particular to the beam-splitting structure design and the making of solar cell.
Background technology
Under the energy crisis that causes in eighties of last century seventies stimulates, also under the demand pull of spacecraft energy resource system, the continuous acquisition of technology breakthrough in photovoltaic technology field.Crystal silicon solar energy battery, non-crystal silicon solar cell, amorphous silicon thin-film solar cell, III-V compound semiconductor solar cell, II-VI compound semiconductor polycrystal film solar cell etc., increasing solar battery technology reaches its maturity.Improving constantly and the lasting reduction of manufacturing cost of photoelectric conversion efficiency makes photovoltaic technology all obtain using widely in space and ground.Look back photovoltaic technology in nearest 10 years development, aspect the efficient raising, the solar battery structure of tying tandem type is the most noticeable more.The average efficiency of InGaP/ (In) GaAs/Ge three knot tandem solar cell large-scale production in 2007 is near 30%.Under 240 times of optically focused, the lab A M1.5D efficient of this multijunction solar cell has surpassed 40%.Multijunction structure can realize the full spectral absorption to sunlight effectively, thereby improves photoelectric conversion efficiency, and in theory, footing is many more, and efficient is high more, and this has been proved to be one of effective way of raising the efficiency.
The most general manufacture method of many at present knot tandem solar cell structures is exactly to prepare sub-batteries at different levels respectively, then they is mechanically stacked up.Yet the method for mechanical cascade itself has very big shortcoming, even for the simplest double-junction solar battery, the same ubiquity of these shortcomings: at first, the top battery must be " transparent " for end battery, and when using thick substrate, doping content can not be too high.Secondly, the bottom electrode Metal Contact of top battery also must be made the grid line configuration as top electrode, and will accurately aim at the top electrode figure of the sub-battery in the two poles of the earth.The sub-battery in the two poles of the earth generally has four outputs, usually will be earlier the sub-cell interconnect of several peers on electricity, go again to be connected with the sub-battery of another grade, externally constitute a two terminal device, interconnected complexity makes mechanical cascade laminated cell be difficult to really drop into large-scale production and application on the electricity.Simultaneously, the at different levels sub-battery of mechanical cascade battery generally all will use substrate separately, and this has also increased manufacturing cost greatly.
With regard to InGaP/ (In) GaAs/Ge three-joint solar cell, its band-gap energy is respectively 1.8,1.4 and 0.67eV.Thereby InGaP is used for absorbing the sunlight generation photo-generated carrier formation photogenerated current of energy greater than 1.8eV, the hot carrier that energy produces after being absorbed greater than the photon of band gap is passed to lattice with unnecessary energy with the form of phonon and is become heat energy, the loss of voltage in the formation opto-electronic conversion.
In addition, the development of the maturation of the gas phase epitaxy of metal organic compound technology of the growth technology of semi-conducting material, particularly III-V compound semiconductor makes the preparation monolithic tie tandem solar cell more becomes possibility.Yet practice up to now shows, is that the photovoltaic technology of representative still can't reach the optimum Match with solar spectrum with InGaP/ (In) GaAs/Ge three knot tandem solar cell; If will mate with solar spectrum to greatest extent, just must in this three knots cascade battery, increase a new knot material.Though band gap width can desirable be arranged in pairs or groups, but owing to be subjected to lattice constant mismatch between different semi-conducting materials and the restriction of the problems such as stress defective brought thus, the above solar cell of growth three knots becomes very difficult, and the growth rate of finished products of material is low simultaneously, cost is expensive.
Summary of the invention
At above-mentioned be that the photovoltaic technology of representative still can't reach the optimum Match with solar spectrum with InGaP/ (In) GaAs/Ge three knot tandem solar cell, and the objective difficulty of making lattice mismatch between the semi-conducting material that the above solar cell of monolithic cascade three knots exists, purpose of the present invention is intended to: the manufacture method that a kind of four-junction solar cell is provided, the mechanical cascade solar cell photoelectric conversion efficiency of three knots was higher relatively in the past inheriting, stable, on the basis of life-span length, raising entire cell system gets the utilization ratio of sunlight, thereby obtains higher open circuit voltage and higher optical output power high conversion rate.
For reaching above-mentioned purpose, the solution that the present invention proposes is:
The manufacture method of four-junction solar cell, it is characterized in that: utilize light-dividing device that solar spectrum is divided into high energy district and low energy district, adopt a unijunction structure matching high-energy section spectrum in the high energy district, and the low energy district realizes the absorption conversion to the full spectrum of sunlight by three knot cascade structure coupling low energy region spectrum.
Further, described light splitting manufacturing process comprises the steps:
Step 1: the epitaxial wafer that utilizes metal-organic chemical vapor deposition equipment method growth for solar battery;
Step 2: on epitaxial wafer, make top electrode, below substrate, make bottom electrode;
Step 3: select for use dichroscope as light-dividing device, utilize the transmission of dichroscope and reflection is divided into solar spectrum long-wave band and short-wave band from the space two-beam;
Step 4: three knot cascades and unijunction solar cell are aimed at corresponding band light beam after the beam split respectively, and the electricity of carrying out battery connects and the installation light focusing unit.
Further, described epitaxial wafer is the cascade structure of three knot indium gallium phosphorus/GaAs/germanium; And described epitaxial wafer is unijunction indium gallium N structure or unijunction zinc selenide structure.
A kind of and the corresponding solar battery structure of the described manufacture method of claim 1 is characterized in that: described solar cell is the structure that three knots add a knot.
The manufacture method of the four-junction solar cell of the present invention's design, its beneficial effect is:
(1). by adopting the solar battery structure of light-dividing device and three-plus-one knot, constitute the solar cell of cascade with the different semi-conducting material of multiple band gap width, absorb the solar spectrum that is complementary most with its material gap length, reduce the heat energy loss in the opto-electronic conversion, realize the absorption of the full spectrum of sunlight to a greater extent, improve photoelectric conversion efficiency.
(2). the incident light separated into two parts after adopting light-dividing device to optically focused, respectively by two groups of different absorbed, reduce mechanical tandem type solar cell and used expensive that a plurality of different substrate causes, and effectively avoided the lattice mismatch issue of growth monolithic cascade four pn junction p n solar cell materials.
(3). the application based on the multijunction solar cell of optically focused, beam split has promoted the power of solar cell unit are, and reduced the manufacturing cost of unit power on system level.
Description of drawings
Fig. 1 is the schematic diagram of beam split multijunction solar cell system configuration of the present invention.
Embodiment
For making the above-mentioned purpose of the present invention, feature and advantage can more obvious easy understanding, below special in conjunction with the specific embodiment of the invention, be described in detail below:
The schematic diagram of beam split multijunction solar cell system configuration of the present invention as shown in Figure 1.Can be clear that by accompanying drawing: this multijunction solar cell system configuration comprises: cell panel body, epitaxial wafer and Semiconductor substrate thereof, light-dividing device.Especially, this solar cell system is the configuration of three-plus-one knot, is promptly undertaken making after electricity links to each other by the solar cell 1a~1c of three knot InGaP/ (In) GaAs/Ge cascades and the solar cell 3 of unijunction indium gallium nitrogen or zinc selenide.Three knot InGaP/ (In) GaAs/Ge tandem solar cell 1a~1c are ripe prior aries, and its method for making is described in detail in background technology, does not repeat them here; And the method for making of unijunction solar cell part is also according to this method.As core technology of the present invention, in the manufacture method of this three-plus-one joint solar cell, also comprise a light-dividing device 2.This light-dividing device 2 can be selected dichroscope for use, is used for sunlight A is divided into high energy district A2 and low energy district A1 two parts.Adopt a unijunction InGaN or ZnSe battery structure 3 at high energy district A2, realize absorption the above photon of 2.7ev; And the low energy district still adopts InGaP/ (In) the GaAs/Ge structure 1a~1c of comparative maturity, structure by this three-plus-one knot, the semi-conducting materials different with multiple band gap width constitute tandem solar cell, sub-batteries at different levels absorb the solar spectrum that is complementary most with its material band gap width, thereby reduce current loss and the loss of voltage of each junction battery in photoelectric conversion process, realize the full spectrum effective conversion of sunlight.
The manufacture method of this multijunction solar cell system, its main implementation step is:
1. with metal-organic chemical vapor deposition equipment method growth for solar battery epitaxial wafer.The structure of this battery epitaxial wafer is respectively InGaP/ (In) the GaAs/Ge solar cell of three knots and the InGaN or the ZnSe solar cell of unijunction;
2. be processed into solar cell respectively on two groups of epitaxial wafers.On the epitaxial wafer of sub-batteries at different levels, make top electrode, and below substrate, make bottom electrode;
3. make the dichroscope beam splitting system,, utilize the transmission of this dichroscope and reflection that solar spectrum spatially is divided into long-wave band and short-wave band two-beam, realize efficient decomposition the full spectrum of sunlight as the light-dividing device of this multijunction solar cell.
4. three knot cascades and unijunction solar cell are aimed at corresponding spectrum band light beam after the beam split respectively, battery is carried out the electricity connection and collective optics is installed, realize the integrated of solar cell, optically focused and beam splitter.
The battery of making according to the manufacture method of beam split multijunction solar cell provided by the invention, by adopting the solar battery structure of light-dividing device and three-plus-one knot, constitute the solar cell of cascade with the semi-conducting material of multiple band gap width, absorb the solar spectrum that is complementary most with the material gap length, can increase the utilance of the above solar energy of 2.7eV.By Theoretical Calculation as can be known, this three-plus-one structural type can reduce the heat energy loss in the opto-electronic conversion, realizes the absorption of the full spectrum of sunlight to a greater extent, and with the efficient raising about 6% of solar cell, photoelectric conversion efficiency reaches 47%.
In addition, incident light separated into two parts after adopting light-dividing device to optically focused, respectively by two groups of different absorbed, reduce mechanical tandem type solar cell and used expensive that a plurality of different substrate causes, and effectively avoided the lattice mismatch issue of growth monolithic four knot cascaded semiconductor solar cell materials.Based on the application of the multijunction solar cell of optically focused, beam split, can promote the power of solar cell unit are, and on system level, reduce the manufacturing cost of unit power, have the market using value of extensive reality.
In sum, be detailed description to the present invention's one specific embodiment, this case protection range is not constituted any limitation, all employing equivalents or equivalence are replaced and the technical method of formation, all drop within the rights protection scope of the present invention.

Claims (6)

1. the manufacture method of four-junction solar cell system, it is characterized in that: utilize light-dividing device that solar spectrum is divided into high energy district and low energy district, mate high-energy section spectrum in the high energy district with a single junction cell, and the low energy district realizes the absorption conversion to the full spectrum of sunlight by three knot cascade structure coupling low energy region spectrum.
2. the manufacture method of four-junction solar cell system according to claim 1, it is characterized in that: described manufacture method comprises the steps:
Step 1: the epitaxial wafer that utilizes metal-organic chemical vapor deposition equipment method growth for solar battery;
Step 2: on epitaxial wafer, make top electrode, below substrate, make bottom electrode;
Step 3: select for use dichroscope as light-dividing device, utilize the transmission of dichroscope and reflection is divided into solar spectrum long-wave band and short-wave band from the space two-beam;
Step 4: three knot cascades and unijunction solar cell are aimed at corresponding band light beam after the beam split respectively, and the electricity of carrying out battery connects and the installation light focusing unit.
3. the manufacture method of four-junction solar cell system according to claim 2 is characterized in that: described epitaxial wafer is the cascade structure of three knot indium gallium phosphorus/GaAs/germanium.
4. the manufacture method of four-junction solar cell system according to claim 2, it is characterized in that: described epitaxial wafer is a unijunction indium gallium N structure.
5. the manufacture method of four-junction solar cell system according to claim 2, it is characterized in that: described epitaxial wafer is a unijunction zinc selenide structure.
One kind with the corresponding solar battery structure of the described manufacture method of claim 1, it is characterized in that: described solar cell system be three the knot add one the knot structure.
CNA2008102431266A 2008-12-01 2008-12-01 Light splitting manufacturing process for four-junction solar cell system Pending CN101478015A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976690A (en) * 2010-08-23 2011-02-16 北京工业大学 Four-junction semiconductor solar photovoltaic cell chip
CN106206849A (en) * 2016-08-24 2016-12-07 中山德华芯片技术有限公司 It is applied to temperature monitoring method prepared by the joint solar cell containing dbr structure six
CN110174772A (en) * 2019-06-24 2019-08-27 北京大学深圳研究生院 A kind of optical spectroscopic device and light splitting photovoltaic system
CN110190147A (en) * 2019-06-24 2019-08-30 北京大学深圳研究生院 A kind of concentration photovoltaic system based on beam splitter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976690A (en) * 2010-08-23 2011-02-16 北京工业大学 Four-junction semiconductor solar photovoltaic cell chip
CN106206849A (en) * 2016-08-24 2016-12-07 中山德华芯片技术有限公司 It is applied to temperature monitoring method prepared by the joint solar cell containing dbr structure six
CN110174772A (en) * 2019-06-24 2019-08-27 北京大学深圳研究生院 A kind of optical spectroscopic device and light splitting photovoltaic system
CN110190147A (en) * 2019-06-24 2019-08-30 北京大学深圳研究生院 A kind of concentration photovoltaic system based on beam splitter

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