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Effect of surface property of polyimide substrate on the formation of pentacene thin-film |
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| Authors: | Chung-Jong Yu Seungmoon Pyo Mihye Yi Kilwon Cho |
| Affiliation: | a Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea b Department of Chemistry, Konkuk University, 1 Hwayangdong, Kwangjin-gu, Seoul, 143-701, Republic of Korea c I & E Polymer Research Center, Korea Research Institute of Chemical Technology, 100 Jangdong, Yuseong, Daejeon, 305-343, Republic of Korea d Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea e Department of Physics, Soongsil University, Seoul 156-743, Republic of Korea |
| Abstract: | We investigated the effect of surface property of polyimide substrate on the formation of pentacene thin-film by using atomic force microscopy (AFM) and X-ray reflectivity (XRR) and diffuse scattering (XDS). Two types of polymer films were prepared: (1) polyimide (PAA-PI) from poly(amic acid) (PAA) (2) polyimide hybrid (PAA-PI-H) prepared by hybridizing the PAA and soluble polyimide (PI) with a octadecyl side chain. The hybridization ratio of PI to PAA was 2/98 in wt%. The water contact angle for PAA-PI-H and PAA-PI were around 80° and 64°, respectively. Morphology of pentacene with a ropelike structure and (1 1 0) peak around 1.4 Å in qz was found when it was deposited on PAA-PI thin-film. Different pentacene morphology was observed when it was deposited on PAA-PI-H thin-film. The different morphology might be due to a 5-6 nm thick additional layer (∼0.95 ρfilm) at the interface between pentacene and PAA-PI-H thin-film caused by a long alkyl side chain introduced to the polymer main chain. |
| Keywords: | 68.37.Ps 68.47.Mn |
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