本文選題：柔性太陽能電池 + 結(jié)構(gòu)化基體��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：柔性電子技術(shù)是一種將電子元件集成在柔性基體上,從而使剛性的電子元件有了較大延展性的新型技術(shù),在近十年來得到了迅速的發(fā)展。柔性太陽能電池就利用此技術(shù),將脆性的GaAs電池模塊粘貼在超彈性材料PDMS上,使整個薄膜電池結(jié)構(gòu)的延展性得到了增加。為了進(jìn)一步增加電池的延展性,并且在不顯著增加薄膜電池總體厚度的情況下,本文提出了一種新的設(shè)計方案,在"單一島體"型柔性太陽能電池基礎(chǔ)之上,將基體的基底與島體之間增加一個方形立柱來隔離基底的變形,使基體形成了"基底-立柱-島體"的結(jié)構(gòu),相當(dāng)于一個"復(fù)合島體"結(jié)構(gòu)。在此結(jié)構(gòu)中,立柱的寬度、厚度以及島體厚度對柔性太陽能電池的延展性有顯著影響。應(yīng)用有限元方法發(fā)現(xiàn)立柱的寬度對界面力和GaAs電池應(yīng)變的影響特別顯著,且立柱寬度小于300μm時基底以上的結(jié)構(gòu)會因立柱失穩(wěn)而傾斜。另外,立柱與島體的厚度對界面力和GaAs電池應(yīng)變的影響程度比立柱的寬度影響要小很多�；椎暮穸鹊挠绊懴啾扔诹⒅膶挾葋碚f可以忽略不計。最后,保護(hù)膜厚度越大對GaAs電池和界面力的影響都會增大。在實際情況中,柔性太陽能電池常常會受到外力的反復(fù)加載,很容易造成軟基底和硬的GaAs電池之間的界面發(fā)生脫粘,從而導(dǎo)致整個結(jié)構(gòu)失效。而此結(jié)構(gòu)的材料間剛度差異非常大,其界面破壞機(jī)理非常復(fù)雜,且至今還沒有關(guān)于柔性太陽能電池界面疲勞方面的研究,因此將重心放在研究"單一島體"與"復(fù)合島體"型太陽能電池在拉伸和彎曲循環(huán)載荷下界面破壞的差異性上�？紤]了包括剪切和拉伸在內(nèi)的內(nèi)聚力模型,并通過采用內(nèi)聚力模型對界面破壞進(jìn)行數(shù)值分析。發(fā)現(xiàn)"單一島體"型柔性太陽能電池界面破壞速率比相同循環(huán)載荷下的"復(fù)合島體"型柔性太陽能電池要快得多。而且,兩種設(shè)計的界面破壞的起始位置顯著不同。例如,在拉伸的循環(huán)加載下,"單一島體"型柔性太陽能電池界面破壞從四個角開始,然后向界面中心逐漸演化。然而,"復(fù)合島體"型柔性太陽能電池界面破壞大致從方形立柱的四個角上的垂直投影開始。此外,循環(huán)載荷越大,"單一島體"型柔性太陽能電池的界面破壞速率越快。另外,兩種設(shè)計都可以忽略導(dǎo)線的影響。最后,所提出的"復(fù)合島體"設(shè)計可延展性能比"單一島體"設(shè)計顯著提高了,變形隔離效果更好。如果電池界面破壞是主要破壞方式,那么"復(fù)合島體"設(shè)計的疲勞壽命將會更長。因此,新設(shè)計的"復(fù)合島體""型柔性太陽能電池疲勞壽命更長。所有這些數(shù)值分析結(jié)果將有助于指導(dǎo)太陽能電池基體的設(shè)計。
[Abstract]:Flexible electronic technology is a new technology which integrates electronic components on flexible matrix and makes rigid electronic components more extensible. It has been developed rapidly in the last ten years.Flexible solar cells use this technology to attach brittle GaAs modules to super-elastic material PDMS, which increases the ductility of the whole thin film cell structure.In order to further increase the ductility of the cell, and without significantly increasing the total thickness of the thin film cell, this paper presents a new design scheme, which is based on the "single island" flexible solar cell.A square column is added between the substrate and the island body to isolate the deformation of the substrate, which makes the matrix form a "base-pillar" structure, which is equivalent to a "composite island body" structure.In this structure, the width, thickness and island thickness of the column have a significant effect on the ductility of flexible solar cells.The finite element method is used to find that the width of the column has a significant effect on the interface force and the strain of the GaAs battery, and that the structure above the base of the column is inclined because of the instability of the column when the width of the column is less than 300 渭 m.In addition, the influence of the thickness of the column and the island body on the interface force and the strain of GaAs battery is much less than that on the width of the column.The effect of the thickness of the base is negligible relative to the width of the column.Finally, the effect of the thickness of the protective film on the GaAs cell and the interface force will increase.In practice, flexible solar cells are often subjected to repeated external loading, which can easily cause the interface between the soft substrate and the hard GaAs cells to be debonded, resulting in the failure of the whole structure.However, the stiffness of the structure is very different, the mechanism of interface failure is very complex, and there is no research on interface fatigue of flexible solar cells.Therefore, the center of gravity is focused on the study of the difference of interface failure between "single island" and "composite island" solar cells under tensile and bending cyclic loading.The cohesive force model including shear and tensile is considered, and the interface failure is analyzed numerically by using cohesion model.It is found that the interface failure rate of the "single island" flexible solar cell is much faster than that of the "composite island" flexible solar cell under the same cyclic load.Moreover, the initial location of the interface failure is significantly different between the two designs.For example, under the cyclic loading of tension, the interface failure of the "single island" flexible solar cell starts at four angles and then evolves to the interface center.However, the interface failure of the composite island type flexible solar cell begins with the vertical projection of the four angles of the square column.In addition, the larger the cyclic load, the faster the interface failure rate of single island flexible solar cell is.In addition, both designs can ignore the influence of wires.Finally the ductility of the proposed "composite island body" design is significantly improved than that of the "single island body" design and the deformation isolation effect is better than that of the "single island body" design.If the battery interface failure is the main failure mode, the fatigue life of the composite island body will be longer.Therefore, the newly designed "composite island" type flexible solar cells have longer fatigue life.All these numerical results will be helpful to guide the design of solar cell matrix.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM914.4

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