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Applied Science and Convergence Technology 2012; 21(1): 12-16

Published online January 1, 2012

Copyright © The Korean Vacuum Society.

Nano-size Study of Surface-modified Ag Anode for OLEDs

Joo Young Kim , Soo In Kim , Kyu Young Lee , Hyeong Keun Kim , Jae Hyeok Jun , Yun Jong Jeong , Mu Chan Kim , Jong Rim Lee , Chang Woo Lee


Although silver is used for T-OLED (Top emitting organic Light-Emitting Diode) as reflective anode, it is not an ideal material due to its low work function. Thus, we study the effect of annealing and atmospheric pressure plasma treatment on Ag film that increases its work function by forming the thin silver oxide layer on its surface. In this study, we deposited silver on glass substrate using RF sputtering. Then we treated the Ag samples annealing at 300oC for 30 minutes in atmosphere or treating the atmospheric plasma treatment for 30, 60, 90, 120s, respectively. We measured the change of the mechanical properties and the potential value of surface with each one at a different treatment type and time.
We used nano-indenter system and KPFM (Kelvin Probe Force Microscopy). KPFM method can be measured the change of surface potential. The nanoindenter results showed that the plasma treatment samples for 30s, 120s had very low elastic modulus, hardness and Weibull modulus. However, annealed sample and plasma treated samples for 60s and 90s had better mechanical properties. Therefore, plasma treatment increases the uniformity thin film and the surface potential that is very effective for the performace of T-OLED.

Keywords: 나노트라이볼로지,나노인덴터,Ag 전극,와이불 분포,Nanotribology,Nano-indenter,Ag anode,Weibull distribution

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