JP2013030583A - 太陽電池用封止膜及びこれを用いた太陽電池 - Google Patents
太陽電池用封止膜及びこれを用いた太陽電池 Download PDFInfo
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- JP2013030583A JP2013030583A JP2011165065A JP2011165065A JP2013030583A JP 2013030583 A JP2013030583 A JP 2013030583A JP 2011165065 A JP2011165065 A JP 2011165065A JP 2011165065 A JP2011165065 A JP 2011165065A JP 2013030583 A JP2013030583 A JP 2013030583A
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- solar cell
- sealing film
- ethylene
- polar monomer
- solar
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Images
Classifications
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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
- H01L31/048—Encapsulation of modules
- H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
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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
- H01L31/048—Encapsulation of modules
- H01L31/049—Protective back sheets
-
- 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
Abstract
【解決手段】太陽電池セル14を封止するために前記太陽電池セル14の裏面側に配置される太陽電池用封止膜13Bであって、エチレン−極性モノマー共重合体、架橋剤及び着色剤を含み、前記着色剤が、260〜360nmの平均粒径を有する白色顔料であることを特徴とする太陽電池用封止膜13B。
【選択図】図1
Description
(1)白色顔料が二酸化チタンである。
(2)白色顔料を、エチレン−極性モノマー共重合体100質量部に対して0.1〜10質量部含む。
(3)エチレン−極性モノマー共重合体がエチレン−酢酸ビニル共重合体である。
本発明において、封止膜に配合する白色顔料は、平均粒径が260〜360nm、好ましくは290〜300nmであるものを使用する。260nmより小さいと長波長領域の反射光を十分に得られない場合があり、360nmより大きいと封止膜の加工性が低下し、また、封止膜が黄色味がかる場合がある。また、この範囲であれば、封止膜に入射する太陽光のうち、700〜1000nmの波長の反射性を向上させることができ、太陽電池、特に結晶シリコン系太陽電池の発電効率の向上に寄与することが可能となる。
本発明においてエチレン−極性モノマー共重合体の極性モノマーは、不飽和カルボン酸、その塩、そのエステル、そのアミド、ビニルエステル、一酸化炭素等を例示することができる。より具体的には、アクリル酸、メタクリル酸、フマル酸、イタコン酸、マレイン酸モノメチル、マレイン酸モノエチル、無水マレイン酸、無水イタコン酸等の不飽和カルボン酸、これら不飽和カルボン酸のリチウム、ナトリウム、カリウムなどの1価金属の塩やマグネシウム、カルシウム、亜鉛などの多価金属の塩、アクリル酸メチル、アクリル酸エチル、アクリル酸イソプロピル、アクリル酸イソブチル、アクリル酸n−ブチル、アクリル酸イソオクチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸イソブチル、マレイン酸ジメチル等の不飽和カルボン酸エステル、酢酸ビニル、プロピオン酸ビニルのようなビニルエステル、一酸化炭素、二酸化硫黄などの一種又は二種以上などを例示することができる。
本発明において架橋剤は、エチレン−極性モノマー共重合体の架橋構造を形成することができるものである。架橋剤は、有機過酸化物又は光重合開始剤を用いることが好ましい。なかでも、接着力、耐湿性、耐貫通性の温度依存性が改善された封止膜が得られることから、有機過酸化物を用いるのが好ましい。
本発明の太陽電池用封止膜は、必要に応じて、さらに架橋助剤を含んでいてもよい。前記架橋助剤は、エチレン−極性モノマー共重合体のゲル分率を向上させ、封止膜の接着性及び耐久性を向上させることができる。
本発明の太陽電池用封止膜は、太陽電池内部の封止性能を考慮すると、優れた接着力を有するのが好ましい。そのために、接着向上剤をさらに含んでいても良い。接着向上剤としては、シランカップリング剤を用いることができる。これにより、優れた接着力を有する太陽電池用封止膜を形成することが可能となる。前記シランカップリング剤としては、γ−クロロプロピルメトキシシラン、ビニルエトキシシラン、ビニルトリス(β−メトキシエトキシ)シラン、γ−メタクリロキシプロピルトリメトキシシラン、ビニルトリアセトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、γ−グリシドキシプロピルトリエトキシシラン、β−(3,4−エポキシシクロヘキシル)エチルトリメトキシシラン、ビニルトリクロロシラン、γ−メルカプトプロピルトリメトキシシラン、γ−アミノプロピルトリエトキシシラン、N−β−(アミノエチル)−γ−アミノプロピルトリメトキシシランを挙げることができる。これらシランカップリング剤は、単独で使用しても、又は2種以上組み合わせて使用しても良い。なかでも、γ−メタクリロキシプロピルトリメトキシシランが特に好ましく挙げられる。
本発明の太陽電池用封止膜は、膜の種々の物性(機械的強度、光学的特性、耐熱性、耐光性、架橋速度等)の改良あるいは調整のため、必要に応じて、可塑剤、アクリロキシ基含有化合物、メタクリロキシ基含有化合物及び/又はエポキシ基含有化合物などの各種添加剤をさらに含んでいてもよい。
上述した本発明の太陽電池用封止膜を形成するには、公知の方法に準じて行えばよい。例えば、上述した各成分を含む組成物を、通常の押出成形、又はカレンダ成形(カレンダリング)等により成形してシート状物を得る方法により製造することができる。また、前記組成物を溶剤に溶解させ、この溶液を適当な塗布機(コーター)で適当な支持体上に塗布、乾燥して塗膜を形成することによりシート状物を得ることもできる。尚、製膜時の加熱温度は、架橋剤が反応しない或いはほとんど反応しない温度とすることが好ましい。例えば、50〜90℃、特に40〜80℃とするのが好ましい。本発明の太陽電池用封止膜の厚さは特に制限されないが、0.05〜2mmである。
本発明の太陽電池の構造は、本発明の太陽電池用封止膜を、太陽電池セルの裏面側に配置してその太陽電池セルを封止する構造を有していれば、特に制限されない。太陽電池において、太陽電池セルを十分に封止するには、例えば、図1に示す結晶シリコン系太陽電池では、表面側透明保護部材11、表面側封止膜13A、太陽電池セル14、本発明の裏面側封止膜13B及び裏面側保護部材12を積層し、加熱加圧など常法に従って、封止膜13A、13Bを架橋硬化させればよい。表面側封止膜13Aとしては、太陽光を透過可能な透明封止膜であれば特に制限されない。
表1に示す配合で各材料をロールミルに供給し、70℃において混練して太陽電池用封止膜組成物を調製した。前記太陽電池用封止膜組成物を、70℃においてカレンダ成形し、放冷後、太陽電池用封止膜(厚さ0.6mm)を作製した。
1.光線反射率
ガラス板(3.2mm)/離型PET(0.1mm)/上記太陽電池用封止膜/遮蔽シート(0.6mm:VT−50 黒、ニチバン製)の順となるように積層し、真空ラミネーターを用いて、145℃、真空時間5分、プレス時間15分にて加熱圧着した後、離型PET、ガラスを取り外した。太陽電池用封止膜の離型PETが接着していた面について、JIS K7105に準拠して、分光光度計(日立製作所製:U−4100)を用いて光線反射スペクトルを測定し、700〜1000nmの光線反射率の平均値を光線反射率(%)とした。
ガラス板(3.2mm)/上記太陽電池用封止膜/ガラス板(3.2mm)となるように積層し、真空ラミネーターにて、真空下、100℃で10分間圧着した後、155℃のオーブン中で45分間圧着することにより、太陽電池用封止膜を架橋させた。この積層体の黄変度(YI)を、JIS−K−7105−6(1981)に準拠して、色差計(SHカラーコンピューター;スガ試験機株式会社製)を用いて測定した。
表1から分かるように、二酸化チタンの平均粒径が260〜360nmである実施例1〜5の封止膜の700〜1000nmの光線反射率は、他の粒径の酸化チタンを配合した比較例の封止膜と比較して高いことが示された。また、二酸化チタンの平均粒径が大きい比較例5及び6は黄色度が高いことが認められた。
12、22 裏面側保護部材
13A、13B、23 太陽電池用封止膜
14、24 太陽電池セル
Claims (7)
- 太陽電池セルを封止するために前記太陽電池セルの裏面側に配置される太陽電池用封止膜であって、
エチレン−極性モノマー共重合体、架橋剤及び着色剤を含み、
前記着色剤が、260〜360nmの平均粒径を有する白色顔料であることを特徴とする太陽電池用封止膜。 - 前記白色顔料が二酸化チタンであることを特徴とする請求項1に記載の太陽電池用封止膜。
- 前記白色顔料は、前記エチレン−極性モノマー共重合体100質量部に対して0.1〜10質量部含むことを特徴とする請求項1又は2に記載の太陽電池用封止膜。
- 前記エチレン−極性モノマー共重合体が、エチレン−酢酸ビニル共重合体であることを特徴とする請求項1〜3の何れか1項に記載の太陽電池用封止膜。
- 請求項1〜4の何れか1項に記載の太陽電池用封止膜を用いたことを特徴とする太陽電池。
- 結晶シリコン系太陽電池であることを特徴とする請求項5に記載の太陽電池。
- 薄膜型太陽電池であることを特徴とする請求項5に記載の太陽電池。
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