Conducting AFM and 2D GIXD studies on pentacene thin films.
Among all organic semiconductors, pentacene has been shown to have the highest thin film mobility reported to date. The crystalline structure of the first few pentacene layers deposited on a dielectric substrate is strongly dependent on the dielectric surface properties, directly affecting the charge mobility of pentacene thin film OTFTs. Herein, we report that there is a direct correlation between the crystalline structure of the initial submonolayer of a pentacene film and the mobility of the corresponding 60-nm-thick films showing terrace-like structure, as confirmed by 2D grazing-incidence X-ray diffraction and atomic force microscopy. Specifically, multilayered pentacene films, grown from single crystal-like faceted islands on HMDS-treated surface, have shown much higher charge mobility (mu = 3.4 +/- 0.5 cm2/Vs) than those with polycrystalline dendritic islands (mu = 0.5 +/- 0.15 cm2/Vs) on OTS-treated ones.
Yang
Hoichang
H
Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Shin
Tae Joo
TJ
Ling
Mang-Mang
MM
Cho
Kilwon
K
Ryu
Chang Y
CY
Bao
Zhenan
Z
D003460:Crystallization; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force / Q000379:methods*; D017646:Organosilicon Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D014961:X-Ray Diffraction / Q000379:methods
D008567:Membranes, Artificial; D017646:Organosilicon Compounds; D012822:Silicon Dioxide