Preparing highly ordered copper phthalocyanine thin-film by controlling the thickness of the modified layer and its application in organic transistors

Para-sexiphenyl ( p -6P) ultrathin film was utilized as the modified layer to grow copper phthalocyanine (CuPc) thin film. The order of the CuPc thin-film morphology exhibits an obvious dependence on p -6P thickness. A conversion of p -6P growth mode from layer-by-layer to island growth was observed. The highest mobility of CuPc transistor based on p -6P modified layer has been obtained by 0.18 cm 2 /V s with the p -6P thickness of 2.4 molecule layer. Therefore, the thickness of modified layer plays a crucial role in thin film growth of organic semiconductor that results in a remarkable influence on the electric characteristics of devices.