A transparent conductive oxide electrode with highly enhanced flexibility achieved by controlled crystallinity by incorporating Ag nanoparticles on substrates
A transparent conductive oxide electrode with highly enhanced flexibility achieved by controlled crystallinity by incorporating Ag nanoparticles on substrates
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DOI：
10.1016/j.jallcom.2014.09.159
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发表时间：
2015-01
影响因子：
6.2
通讯作者：
Ross E. Triambulo;H. Cheong;Gun-hwan Lee;In-Sook Yi;J. W. Park
中科院分区：
文献类型：
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作者：
Ross E. Triambulo;H. Cheong;Gun-hwan Lee;In-Sook Yi;J. W. Park
我们报道了在聚合物基底上合成高度柔性的氧化铟锡（ITO），该聚合物基底的表面由直径小于20 nm的氧化物涂覆的银纳米颗粒（AgNPs）设计。聚酰亚胺（PI）基板上旋涂银离子油墨，随后进行热处理，形成AgNP涂层。通过O2等离子体处理形成Ag氧化物以降低AgNPs的光吸收。ITO是直流磁控溅射沉积在AgNP的顶部。银纳米颗粒上的ITO主要以（2 2 2）晶向生长。这与在聚合物上生长的ITO的典型微结构形成对比，所述微结构是生长的c-ITO成核物嵌入在无定形ITO（a-ITO）基质中，如颗粒复合物。AgNP上的ITO的表面粗糙度与没有AgNP的PI上的ITO一样小。与裸PI上的ITO相比，AgNP涂覆的聚合物上的ITO的结晶性质导致电阻率（ρ）降低65%。此外，AgNP上的ITO的电阻率变化（Δ p）在弯曲半径（rb）低至4 mm时仅为8%，而未涂覆的聚合物上的ITO在anrb为10 mm时由于裂纹数量的急剧增加而变得几乎绝缘。为了验证其在显示器中的潜在应用，在AgNPs上的ITO上制备了柔性有机发光二极管（f-OLED），并与裸PI上的ITO上的f-OLED的性能进行了比较。
We report the synthesis of highly flexible indium tin oxide (ITO) on a polymer substrate whose surface was engineered by oxide-coated Ag nanoparticles (AgNPs) smaller than 20 nm in diameter. Polyimide (PI) substrates were spin coated with Ag ion ink and were subsequently heat treated to form AgNP coatings. The Ag oxide was formed by O2plasma treatment to reduce the light absorbance by AgNPs. ITO was dc magnetron sputter-deposited atop the AgNPs. The ITO on the AgNPs was crystalline grown primarily with (2 2 2) growth orientation. This contrasts to the typical microstructure of ITO grown on the polymer, which is that growingc-ITO nucleates are embedded in an amorphous ITO (a-ITO) matrix like a particulate composite. The surface roughness of ITO on AgNPs was as small as the ITO on PI without AgNPs. The crystalline nature of the ITO on the AgNP-coated polymer resulted in the decrease of electric resistivity (ρ) by 65% compared to that of ITO on the bare PI. Furthermore, an electric resistivity change (Δρ) of the ITO on the AgNPs was only 8% at a bending radius (rb) down to 4 mm, whereas the ITO on the non-coated polymer became almost insulating at anrbof 10 mm, owing to a drastic increase in the number of cracks. To validate the potential application in the displays, flexible organic light emitting diodes (f-OLEDs) were fabricated on the ITO on AgNPs and the performances was compared with the f-OLED on ITO on the bare PI.