Institute of Solid State Physics
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SS22 WS22 SS23 WS23 SS24 WS24 Guidelines for Master Students
Characterisation of Ph-BTBT-10 Thin Films prepared by Physical Vapor Deposition Recently benzothieno[3,2-b][1] benzothiophene-derivatives gained interest in the scientific community due to their organic semiconducting properties. For example, it has been demonstrated that 2-decyl-7-phenyl-[1] benzothieno[3,2-b][1] benzothiophene (Ph-BTBT-10) shows high FET-mobilities as well as transitions into liquid crystalline phases. In this work, films of varying thicknesses ranging from nominal submonolayers to films of more than 600 Å were prepared by physical vapor deposition (PVD) on Si. Films were investigated in terms of layer morphology and film properties by atomic force microscopy and X-ray reflectometry as well as crystal structure by specular X-ray diffraction and grazing incidence X-ray diffraction. The measurements show that samples with a low nominal thickness can be described by a repeating unit containing two upright standing molecules on top of each other as described by the bulk structure. Starting from a nominal thickness of 300 Å another type of molecular packing appears which arises from an unknown polymorph. |
