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High work function of Al-doped zinc-oxide thin films as transparent conductive anodes in organic light-emitting devices |
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| Authors: | T.W. Kim D.C. Choo W.K. Choi |
| Affiliation: | a Research Institute of Information Display, Division of Electronics and Computer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea b Thin Film Material Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-701, Republic of Korea c Charged Particle Beam and Plasma Laboratory/PDP Research Center, Department of Electrophysics, Kwangwoon University, Seoul 139-701, Republic of Korea |
| Abstract: | Deposition of Al-doped ZnO (AZO) films with various film thicknesses on glass substrates was performed to investigate the feasibility of using AZO films as anode electrodes in organic light-emitting devices (OLEDs). The electrical resistivity of the AZO films with a 180-nm thickness was 4.085 × 10−2 Ω cm, and the average optical transmittance in the visible range was 80.2%. The surface work function for the AZO films, determined from the secondary electron emission coefficients obtained with a focused ion beam, was as high as 4.62 eV. These results indicate that AZO films grown on glass substrates hold promise for potential applications as anode electrodes in high-efficiency OLEDs. |
| Keywords: | 68. 55.jk 72 15.Eb 73. 20.At |
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