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Effect of Ca interlayer thickness on electron injection of lithium quinolate/Ca/Al cathodes |
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| Authors: | Sung Hyun Kim Jyongsik Jang |
| Affiliation: | a School of Chemical and Biological Engineering, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea b AMOLED Business Team, Samsung SDI, Gongse-dong, Kiheung-gu, Yongin-si, Kyonggi-do 449-577, Republic of Korea c Department of Polymer Science and Engineering, Dankook University, Jukjeon-dong, Suji-gu, Yongin, Kyeonggi 448-701, Republic of Korea |
| Abstract: | Electron injection behavior of lithium quinolate (Liq)/Ca/Al cathode was investigated by using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy (UPS). Interfacial energy barrier lowering of Liq/Ca/Al cathode was dependent on Ca thickness and maximum energy level shift was observed at a Ca thickness of 1 nm. Maximum current density could be obtained in Liq/Ca/Al device at a Ca thickness of 1 nm and it was well correlated with energy level shift from UPS measurement. Power efficiency of Liq/Al device could be improved by more than 70% by inserting Ca layer between Liq and Al. |
| Keywords: | Cathode Power efficiency Energy barrier Ultraviolet photoelectron spectroscopy |
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