CN106206825B - The multijunction solar cell of Window layer and launch site containing low optical refringence - Google Patents

The multijunction solar cell of Window layer and launch site containing low optical refringence Download PDF

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CN106206825B
CN106206825B CN201610802693.5A CN201610802693A CN106206825B CN 106206825 B CN106206825 B CN 106206825B CN 201610802693 A CN201610802693 A CN 201610802693A CN 106206825 B CN106206825 B CN 106206825B
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window layer
launch site
battery
solar cell
sub
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CN106206825A (en
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李欣益
陆宏波
张玮
杨丞
张梦炎
张华辉
陈杰
郑奕
张建琴
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Shanghai Institute of Space Power Sources
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/544—Solar cells from Group III-V materials

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Photovoltaic Devices (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
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  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Sustainable Energy (AREA)

Abstract

The invention discloses a kind of Window layer containing low optical refringence and the multijunction solar cell of launch site, the multijunction solar cell is by several broad stopbands, middle forbidden band, the sub- battery cascade composition of low energy gap, every sub- battery all has Window layer, launch site, base and back surface field layer, described launch site uses the sub- battery main body material of n-type, Window layer uses n-type material, the window layer material energy gap is more than launch site battery main body material, the window layer material is not less than 0.50eV with launch site battery main body material energy gap difference, light refractive index difference not higher than 0.25 in 500 900nm wave-length coverages.The multijunction solar cell that the present invention is provided, is combined by using low optical refringence Window layer with launch site, and the incident sunshine of reduction lifts the current density of each sub- battery, so as to significantly improve the performance of multijunction solar cell in the reflection of each sub- battery Window layer.

Description

The multijunction solar cell of Window layer and launch site containing low optical refringence
Technical field
The present invention relates to a kind of solar cell.Specifically a kind of Window layer containing low optical refringence and transmitting The multijunction solar cell in area.
Background technology
Multijunction solar cell is realized in wide spectral range too by the different semiconductor absorber material of multilayer energy gap The abundant collection of positive photon energy and efficiently utilization, so as to obtain high photoelectric transformation efficiency.The efficient multi-node of a new generation is too Positive electricity pond, by cascading the sub- battery that the semi-conducting material of multiple a variety of different energy gaps is made, realizes photon energy Efficiently utilize, but because each sub- battery is in series relationship, there is certain difficulty to the abundant collection of solar photon.
Every sub- battery all has the basic structures such as Window layer, launch site, base and back surface field layer.In conventional batteries structure, In order to realize that carrier is efficiently separated, it is to avoid interface, which meets, causes degradation, it is desirable to which window layer material energy gap is much larger than Battery main body (launch site and base) energy gap, while the not extinction that should also try one's best, it is to avoid photon loss, therefore Al0.5In0.5P Material turns into preferable selection.But Al0.5In0.5The middle forbidden band Al of P light refractive indexes and multijunction cellxGa1-xAs materials (x= 0.20~0.37) there is larger difference, incident sunshine is after the sub- battery of prime is penetrated, by the window of the sub- battery of middle forbidden band On layer/launch site interface violent emission phenomena occurs for mouth, incident photon quantity is significantly reduced, so as to have impact on cell performance Energy.Because multijunction cell is complicated, it is more difficult to realize the compensation of incident photon by battery antireflective film layer.
The content of the invention
It is an object of the invention to provide a kind of multijunction solar cell, low optical refringence Window layer and launch site are used Combination reduce reflection of the incident light in the sub- battery Window layer/launch site interface of middle forbidden band.
In order to achieve the above object, the invention provides a kind of Window layer containing low optical refringence and launch site Multijunction solar cell, the multijunction solar cell is made up of several broad stopbands, middle forbidden band, the sub- battery cascade of low energy gap, per height Battery all has Window layer, launch site, base and back surface field layer, and described launch site uses the sub- battery main body material of n-type, Window layer Using n-type material, the window layer material energy gap is more than launch site battery main body material, the window layer material and launch site electricity Tank main body material energy gap difference is not less than light refractive index difference not higher than 0.25 in 0.50eV, 500-900nm wave-length coverages.
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described width The sub- battery energy gap 1.90-2.20eV of forbidden band, the sub- battery energy gap 1.35-1.75eV of described middle forbidden band, described is narrow The sub- battery energy gap 0.60-1.20eV of forbidden band.
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described hair Battery main body material of the area using the Si n-types adulterated is penetrated, thickness is 40-100nm, and doping concentration is 1 × 1017~1 × 1018cm-3。
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described electricity Tank main body material uses AlxGa1-xAs materials, wherein, x=0.20~0.37.
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described window The energy gap of mouth layer material is more than battery main body material, light refractive index and the battery main body material phase of the window layer material Closely.
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described window Mouth layer uses the Al that Si adulteratesxGa1-xAs, wherein, x=0.40~0.70.
The above-mentioned Window layer containing low optical refringence and the multijunction solar cell of launch site, wherein, described window Mouth thickness degree is 10-50nm, and doping concentration is 1 × 1018~5 × 1018cm-3。
The present invention provides the multijunction solar cell combined containing low optical refringence Window layer with launch site, by using Low optical refringence Window layer is combined with launch site, and the incident sunshine of reduction is in the reflection of each sub- battery Window layer, and lifting is respectively The current density of sub- battery, so as to significantly improve the performance of multijunction solar cell.
Brief description of the drawings
Fig. 1 is a kind of multijunction cell structural representation of the invention.
Fig. 2 is preferred for the multijunction solar cell combined containing low optical refringence Window layer with launch site of the present invention The battery structure schematic diagram of embodiment.
Fig. 3 is preferred for the multijunction solar cell combined containing low optical refringence Window layer with launch site of the present invention Embodiment and the quantum efficiency spectrum of traditional multijunction cell are contrasted with reflectance spectrum.
Embodiment
Technical scheme is described further below in conjunction with accompanying drawing.
As shown in figure 1, for the present invention provide it is a kind of containing low optical refringence Window layer combined with launch site it is many Connection solar cell, the multijunction solar cell based on different energy gap III-V group semi-conductor materials, by multiple broad stopbands, in The sub- battery of forbidden band, low energy gap (10,20,30) cascade composition.The launch site 50 of the sub- battery of middle forbidden band of multijunction solar cell uses n The sub- battery main body material of type doping, its thickness is 40-100nm, and doping concentration is 1 × 1017~1 × 1018cm-3；Window layer 40 Using n-type material, the material energy gap is more than battery main body material, and its light refractive index is slightly above battery main body material, its Thickness is 10-50nm, and doping concentration is 1 × 1018~5 × 1018cm-3。
By taking GaInP/GaAs binodes battery (there is a sub- battery in broad stopband and a middle sub- battery of forbidden band) as an example, battery Structure is as shown in Fig. 2 the Al that the Window layer 1 of the sub- batteries of forbidden band GaAs is adulterated using n-type Si in binode battery0.45Ga0.55As materials Replace tradition AlInP materials, window layer thickness 30nm, doping concentration is 2 × 1018cm-3, the launch site 2 of the sub- batteries of GaAs, base Area 3 and back surface field layer 4 use conventional thickness and doping concentration.The binode battery uses low pressure metal organic vapor phase epitaxy (MOCVD) equipment grows on n-type GaAs substrates 5.The quantum efficiency and reflectance spectrum that battery is made are as shown in Figure 3.By to adopting With traditional AlInP Window layers battery (being marked with " △ ") and low optical refringence Al0.45Ga0.55As Window layer batteries are (with "○" Mark) contrast as can be seen that the quantum response characteristic (dotted line in figure of the change influence sub- batteries of GaAs of window layer material It is shown), from 600nm to 950nm, battery surface reflectivity is significantly reduced in spectral region, thus binode battery short circuit current density It is obviously improved, battery efficiency is improved.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (6)

1. a kind of Window layer containing low optical refringence and the multijunction solar cell of launch site, it is characterised in that many knots Solar cell is made up of several broad stopbands, middle forbidden band, the sub- battery cascade of low energy gap, and every sub- battery all has Window layer, hair Area, base and back surface field layer are penetrated, described launch site uses the sub- battery main body material of n-type, and Window layer uses n-type material, the n-type material Expect that energy gap is more than launch site battery main body material, the n-type material and launch site battery main body material energy gap difference be not small In light refractive index difference not higher than 0.25 in 0.50eV, 500-900nm wave-length coverages.
2. the Window layer as claimed in claim 1 containing low optical refringence and the multijunction solar cell of launch site, it is special Levy and be, the sub- battery energy gap 1.90-2.20eV in described broad stopband, the sub- battery energy gap 1.35- of described middle forbidden band 1.75eV, the sub- battery energy gap 0.60-1.20eV of described low energy gap.
3. the Window layer as claimed in claim 1 containing low optical refringence and the multijunction solar cell of launch site, it is special To levy and be, described launch site is using the battery main body material of the Si n-types adulterated, and thickness is 40-100nm, doping concentration is 1 × 1017~1 × 1018cm-3。
4. the Window layer as claimed in claim 3 containing low optical refringence and the multijunction solar cell of launch site, it is special Levy and be, described battery main body material uses AlxGa1-xAs materials, wherein, x=0.20~0.37.
5. the Window layer as claimed in claim 1 containing low optical refringence and the multijunction solar cell of launch site, it is special Levy and be, described Window layer uses the Al that Si adulteratesxGa1-xAs, wherein, x=0.40~0.70.
6. the Window layer as claimed in claim 5 containing low optical refringence and the multijunction solar cell of launch site, it is special Levy and be, described window layer thickness is 10-50nm, doping concentration is 1 × 1018~5 × 1018cm-3。
CN201610802693.5A 2016-09-05 2016-09-05 The multijunction solar cell of Window layer and launch site containing low optical refringence Active CN106206825B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101083290A (en) * 2006-06-02 2007-12-05 昂科公司 Metamorphic layers in multijunction solar cells
CN104576799A (en) * 2015-01-23 2015-04-29 浙江大学 Solar cell with phase grating nanostructure

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US20090272430A1 (en) * 2008-04-30 2009-11-05 Emcore Solar Power, Inc. Refractive Index Matching in Inverted Metamorphic Multijunction Solar Cells

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101083290A (en) * 2006-06-02 2007-12-05 昂科公司 Metamorphic layers in multijunction solar cells
CN104576799A (en) * 2015-01-23 2015-04-29 浙江大学 Solar cell with phase grating nanostructure

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