Institute of Solid State Physics
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SS22 WS22 SS23 WS23 SS24 WS24 Guidelines for Master Students
Thermal gradient crystallization of Ph-BTBT-10 Ph-BTBT-10 gained interest, because it is an organic semiconductor and shows high charge carrier mobilities in OTFTs. In this thesis, drop-casted samples of Ph-BTBT-10 were treated with the thermal gradient technique. The thermal gradient technique is a method to perform crystallization from the melt. The samples pass through a gradient that is formed by two heating stages that are separated by a small gap, where one stage is held at a temperature above the melting point and the other stage beneath the crystallization temperature. During movement through the gradient the films were investigated with a polarized optical microscope. The produced films were characterized by X-ray diffraction and Grazing Incidence X-ray diffraction. With the X-ray diffraction data Williamson-Hall plots were created. Williamson-Hall is a method to obtain the crystallite size and the micro strain. All Bragg peaks should lie on one line but the gradient treated samples show a separation of the odd and even 00l peaks. The even 00l peaks are sharp and the odd 00l peaks are broad. The first approach to explain this behavior is that the molecules deviate from the perfect alignment and are tilted against each other. This approach is supported by simulations. |
