- 學位論文
PEDOT:PSS薄膜鍍於ITO基板之撓曲破壞對光電效能與機械性質的影響
The Impact Of Bending Damage Of PEDOT:PSS Thin Film Coated On ITO Substrate On The Optical/Electrical Performance And Mechanical Properties
摘要
目前可撓曲顯示器發展尚在起步，相關研究主要在探討基板薄膜層之發光效率為多，針對基板薄膜層撓曲之研究較少。而基板薄膜層撓曲的相關文獻中，大部分探討金屬膜和單一高分子薄膜的拉伸與單次灣曲，並未在光電與機械性質做整合性探討。因此本研究用製作發光元件基本材料的ITO薄膜和PEDOT:PSS薄膜，將含有ITO薄膜的塑膠基板和PEDOT:PSS鍍於ITO塑膠基板，作多次反覆的撓曲，來探討其撓曲前後之間光電效能與機械性質的變化。 本研究將ITO基板，和PEDOT:PSS薄膜旋轉塗佈法於ITO基板，使用自製自動化可撓曲機構，分別作0、500、1000、3000、5000、7000、10000次撓曲之加速破壞。接著量測撓曲後，電阻率變化、光穿透率和光反射率、表面形變SEM圖、表面形變光學顯微鏡圖、楊氏系數和硬度，來分析撓曲後產生的裂縫，對光電效能與機械性質的影響，並將光電效能與機械性質的之間關係作連接。 研究結果顯示，ITO基板撓曲一萬次後，電阻阻抗非常高，甚至毀壞不導電。在多了一層PEODT:PSS薄膜在ITO基板上時，PEDOT:PSS薄膜會降低已經升高的ITO電阻阻抗，並發現PEDOT:PSS具有修補ITO裂縫，穩定ITO導電率。並且由PEODT:PSS薄膜鍍於ITO基板之撓曲至二千次時的電阻率變化，可推測PEDOT:PSS薄膜撓曲後，會與ITO薄膜產剝離現象。最後，本研究發現撓曲後產生的裂縫，會造成基板薄膜光散射，使光穿透率下降。
並列摘要
The development of flexible display technology is still in an early stage. So far, most studies focus on luminous efficiency of the substrate film layer. For few studies on the bending study of the substrate film layer, they are limited to the tensile and single bending of metallic membrane and single polymer film without any integrated investigation on photoelectric and mechanical properties. This study conducted bending test for basic light emitting layers including ITO substrate and PEDOT:PSS coated on ITO substrate to explore the impact of repeated bending on photoelectric performance and mechanical properties. This researcher employed a self-made automatically bending machine to conduct accelerated bending destruction. A sequence of 0, 500, 1000, 3000, 5000, 7000, 10000 bending cycles were conducted on ITO subtrate and PEDOT:PSS spin coated on ITO substrate. The resistivity changes, transmittance and reflectance, SEM images and optical microscope of the surface deformation, and Young's modulus and hardness were measured to analyze the impact of cracks after bending on photoelectric performance and mechanical properties and made a correlation with the two. The results showed that the resistance of ITO substrate is extremely high due to severe destruction of the ITO thin film on the ITO substrate after ten thousand bending cycles. However, the ITO substrate with PEDOT:PSS thin film coating displays the ability to repair the cracks on ITO substrate and stabilize the conductivity of ITO layer. The resistivity change of PEODT:PSS thin film coated on ITO substrate up to two thousand bending cycles indicate that the PEDOT:PSS thin film coating may debond from the ITO substrate. Finally, the cracks on the substrate film layer due to bending will lead to light scattering and degrade light transmittance.