DE102009056129A1 - Rear side layer system for thin-film solar module, has transition or border region arranged between adaptation layer and rear layer and having additional roughness value of greater than certain percent related to nominal layer thickness - Google Patents
Rear side layer system for thin-film solar module, has transition or border region arranged between adaptation layer and rear layer and having additional roughness value of greater than certain percent related to nominal layer thickness Download PDFInfo
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- DE102009056129A1 DE102009056129A1 DE102009056129A DE102009056129A DE102009056129A1 DE 102009056129 A1 DE102009056129 A1 DE 102009056129A1 DE 102009056129 A DE102009056129 A DE 102009056129A DE 102009056129 A DE102009056129 A DE 102009056129A DE 102009056129 A1 DE102009056129 A1 DE 102009056129A1
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- 239000010409 thin film Substances 0.000 title claims abstract description 20
- 230000006978 adaptation Effects 0.000 title claims abstract description 9
- 230000007704 transition Effects 0.000 title claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000004518 low pressure chemical vapour deposition Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000003486 chemical etching Methods 0.000 claims description 3
- 238000001020 plasma etching Methods 0.000 claims description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 27
- 239000011787 zinc oxide Substances 0.000 abstract description 13
- 239000006096 absorbing agent Substances 0.000 description 14
- 229910021417 amorphous silicon Inorganic materials 0.000 description 7
- 229910021424 microcrystalline silicon Inorganic materials 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910006404 SnO 2 Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
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- 230000011218 segmentation Effects 0.000 description 2
- 241000887125 Chaptalia nutans Species 0.000 description 1
- 241000409201 Luina Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1884—Manufacture of transparent electrodes, e.g. TCO, ITO
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor 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
- H01L31/04—Semiconductor 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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/0445—PV modules or arrays of single PV cells including thin film solar cells, e.g. single thin film a-Si, CIS or CdTe solar cells
- H01L31/046—PV modules composed of a plurality of thin film solar cells deposited on the same substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor 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
- H01L31/04—Semiconductor 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 adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/056—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means the light-reflecting means being of the back surface reflector [BSR] type
-
- 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
- Y02E10/52—PV systems with concentrators
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- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Rückseitenschichtsystem für Dünnschichtsolarmodule, ein Dünnschichtsolarmodul und ein Verfahren zur Herstellung eines Rückseitenschichtsystems für Dünnschichtsolarmodule.The present invention relates to a backsheet system for thin film solar modules, a thin film solar module, and a method of manufacturing a backsheet system for thin film solar modules.
Dünnschichtsolarmodule sind aus dem Stand der Technik bekannt. In der Regel bestehen sie aus monolithisch verschalteten Solarzellen.
Im Bereich der silizium-basierten Dünnschichtphotovoltaik existieren zur Zeit vor allem zwei Lösungsansätze, um die besagte Rückreflexion zu verwirklichen. Lösungsansatz A (Variante A) ist in
In Variante A wird standardmäßig Zinkoxid (ZnO) als Rückkontaktschicht
Lösungsmöglichkeit B (Variante B) ist in
Beide Varianten haben Nachteile. Der Hauptnachteil bei Variante A ist die Separation von elektrischen und optischen Anforderungen in zwei Schichten, wobei sich die reflektierende Schicht
Dadurch kann das Potential der Weitwinkel-Rückstreuung im dielektrischen Rückreflektor nur unzureichend genutzt werden. Darüber hinaus wird vor allem das schräg-rückreflektierte Licht in der TCO-Schicht
Hauptnachteil bei Variante B ist die geringe Streuwirkung des Rückreflektorsystems, da die entstehenden Grenzflächen aus z. B. gesputterten ZnO oder Silber alle relativ glatt sind und eine Weitwinkel-Rückstreuung nur in Folge der dem Schichtsystem zugrunde liegenden Frontkontaktrauhigkeit hervorgerufen wird. Zudem wachsen Absorber und Rückkontakt eher konformal auf, wie in
Ausgehend vom vorgenannten Stand der Technik ist es daher Aufgabe der vorliegenden Erfindung, ein Rückseitenschichtsystem für Dünnschichtsolarmodule bereitzustellen, das eine bessere Streuung der Reflexion erreicht und damit zu einem höheren Wirkungsgrad der Dünnschichtsolarmodule führt. Weitere Aufgaben der Erfindung sind die Bereitstellung eines Dünnschichtsolarmoduls mit einem erfindungsgemäßen Rückseitenschichtsystem und die Angabe eines Verfahrens zur Herstellung eines erfindungsgemäßen Rückseitenschichtsystems.Based on the aforementioned prior art, it is therefore an object of the present invention to provide a back layer system for thin-film solar modules, which achieves a better dispersion of the reflection and thus leads to a higher efficiency of the thin-film solar modules. Further objects of the invention are the provision of a thin-film solar module with a back-side layer system according to the invention and the disclosure of a method for producing a back-side layer system according to the invention.
Die Lösung der Aufgabe der Erfindung erfolgt mit einem Rückseitenschichtsystem gemäß Anspruch 1. Die weiteren Aufgaben werden durch ein Dünnschichtsolarmodul gemäß Anspruch 4 und ein Herstellungsverfahren gemäß Anspruch 5 erfüllt. Vorteilhafte Ausgestaltungen und bevorzugte Ausführungsformen der Erfindung sind in den Unteransprüchen angegeben.The object of the invention is achieved with a backsheet system according to claim 1. The further objects are achieved by a thin-film solar module according to claim 4 and a manufacturing method according to claim 5. Advantageous embodiments and preferred embodiments of the invention are specified in the subclaims.
Das erfindungsgemäße Rückseitenschichtsystem für Dünnschichtsolarmodule umfasst einen Rückkontakt, wobei der Rückkontakt eine leitfähige, lichtreflektierende Rückschicht und eine an die Rückschicht auf der Seite des Lichteinfalls angrenzende Anpassungsschicht aufweist. Das Rückseitenschichtsystem zeichnet sich dadurch aus, dass ein Grenzbereich zwischen der Anpassungsschicht und der Rückschicht einen zusätzlichen Rauhigkeitswert (RMS-Wert) von 25% bezogen auf die nominale Schichtdicke ermittelt durch das Messverfahren AFM (atomic force microscope) aufweist, die zudem per Nachbehandlung (Plasmaätzen bzw. chemisches Ätzen) weiterhin deutlich erhöht werden kann.The backsheet system according to the invention for thin-film solar modules comprises a back contact, wherein the back contact has a conductive, light-reflecting back layer and an adaptation layer adjoining the back layer on the side of the light incidence. The backsize layer system is characterized in that a boundary region between the matching layer and the back layer has an additional roughness value (RMS value) of 25% relative to the nominal layer thickness determined by the AFM (atomic force microscope) measuring method, which is further enhanced by post-treatment (plasma etching or chemical etching) can be further increased significantly.
Durch den erhöhten Rauhigkeitswert wird eine diffuse Reflexion des Lichtes erreicht. Damit ist die Streuung an der reflektierenden Grenzfläche verbessert. Aufgrund des schrägen Reflexionswinkels verlängert sich der optische Weg des reflektierten Lichtes durch den Absorber erheblich. Das erfindungsgemäße Rückseitenschichtsystem kann vorteilhaft bei dünnen Absorberschichten eingesetzt werden, besonders für im nahen infraroten Spektralbereich schwach absorbierende mikrokristalline Zellen. Aufgrund der relativ geringen Depositionsrate dieser Absorberschicht erfolgt damit einhergehend eine deutliche Reduzierung der Herstellungskosten der Solarzellen.Due to the increased roughness value, a diffuse reflection of the light is achieved. This improves the scattering at the reflecting interface. Due to the oblique angle of reflection, the optical path of the reflected light through the absorber increases considerably. The backsize layer system according to the invention can advantageously be used with thin absorber layers, especially for microcrystalline cells which absorb weakly in the near infrared spectral range. Due to the relatively low deposition rate of this absorber layer is accompanied by a significant reduction in the manufacturing cost of solar cells.
Vorzugsweise ist die Anpassungsschicht eine als Diffusor wirkende LPCVD-ZnO-Schicht, welche mittels einer chemischen Gasphasenabscheidung bei niedrigen Drücken (Low Pressure chemical vapour deposition) aufgebracht wurde.Preferably, the matching layer is a diffuser-acting LPCVD-ZnO layer deposited by low pressure chemical vapor deposition.
Die Rückschicht besteht vorzugsweise aus einem Metall. Durch das Metall wird eine gute elektrische Leitfähigkeit der Rückschicht erreicht.The backing layer is preferably made of a metal. The metal achieves good electrical conductivity of the backing layer.
Weiterhin umfasst die Erfindung ein Dünnschichtsolarmodul, das ein erfindungsgemäßes Rückseitenschichtsystem umfasst.Furthermore, the invention comprises a thin-film solar module which comprises a back-side layer system according to the invention.
Darüber hinaus umfasst die Erfindung ein Verfahren zur Herstellung eines erfindungsgemäßen Rückseitenschichtsystems für Dünnschichtsolarmodule mit einem Rückkontakt, wobei der Rückkontakt eine leitfähige, lichtreflektierende Rückschicht und eine an die Rückschicht auf der Seite des Lichteinfalls angrenzende Anpassungsschicht aufweist. Das erfindungsgemäße Verfahren ist durch den Schritt des Aufwachsens einer Anpassungsschicht mit zusätzlichem Rauhigkeitswert (RMS-Wert) von 25% bezogen auf die nominale Schichtdicke, ermittelt durch ein Messverfahren mittels AFM (atomic force microscope), gekennzeichnet. Durch Nachbehandlung (Plasmaätzen bzw. chemisches Ätzen) kann der Rauhigkeitswert nochmals deutlich erhöht werden.In addition, the invention includes a method of making a backsheet system of the invention for thin film solar modules having a back contact, the back contact having a conductive light reflective backing layer and an alignment layer adjacent to the backing layer on the side of the light incident. The method according to the invention is characterized by the step of growing an adaptation layer with an additional roughness value (RMS value) of 25% based on the nominal layer thickness, determined by a measurement method by means of AFM (atomic force microscope). By aftertreatment (plasma etching or chemical etching), the roughness value can be significantly increased again.
Vorzugsweise erfolgt das Aufwachsen durch ein LPCVD-Verfahren. Hierbei wird die natürliche Wachstumsmorphologie des durch das LPCVD-Verfahren abgeschiedenen ZnO als Streugrenzfläche ausgenutzt.Preferably, growth is by an LPCVD method. Here, the natural growth morphology of the ZnO deposited by the LPCVD method is utilized as the scattering surface.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Zuhilfenahme der Schnittdarstellung nach
Es folgt eine dünne selbststrukturierte Anpassungsschicht aus Zinkoxid, die bevorzugt mittels eines LPCVD-Verfahrens aufgetragen wurde. Die LPCVD-ZnO-Schicht
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102009056129A DE102009056129A1 (en) | 2009-10-27 | 2009-11-27 | Rear side layer system for thin-film solar module, has transition or border region arranged between adaptation layer and rear layer and having additional roughness value of greater than certain percent related to nominal layer thickness |
Applications Claiming Priority (3)
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DE102009050791.4 | 2009-10-27 | ||
DE102009050791 | 2009-10-27 | ||
DE102009056129A DE102009056129A1 (en) | 2009-10-27 | 2009-11-27 | Rear side layer system for thin-film solar module, has transition or border region arranged between adaptation layer and rear layer and having additional roughness value of greater than certain percent related to nominal layer thickness |
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DE102009056129A1 true DE102009056129A1 (en) | 2011-04-28 |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6593522B2 (en) * | 2000-03-29 | 2003-07-15 | Sanyo Electric Co., Ltd. | Solar cell device |
US20090242020A1 (en) * | 2008-04-01 | 2009-10-01 | Seung-Yeop Myong | Thin-film photovoltaic cell, thin-film photovoltaic module and method of manufacturing thin-film photovoltaic cell |
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2009
- 2009-11-27 DE DE102009056129A patent/DE102009056129A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6593522B2 (en) * | 2000-03-29 | 2003-07-15 | Sanyo Electric Co., Ltd. | Solar cell device |
US20090242020A1 (en) * | 2008-04-01 | 2009-10-01 | Seung-Yeop Myong | Thin-film photovoltaic cell, thin-film photovoltaic module and method of manufacturing thin-film photovoltaic cell |
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Effective date: 20111005 |