Spontaneous formation of ordered organic thin films can be achieved by self-assembly (SA) technique (chemisorption) that is simpler and more versatile. SA films have higher stabilities towards heat, time, pressure and chemical circumstances and have better structure regularities than Langmuir-Blodgett films. SA films have more possibilities in numerous application, such as molecular electronics, monlinear optics, sensors, biology and the modification of surface properties.