Semiconductor electromechanical sensors are used widely in industry, space technology, environmental monitoring and assessment and many other applications. Therefore, organic semiconductor materials based devices have been the subject of intense investigation in the past few years due to their low cost, simplicity of devices fabrication, and interesting electrical and optical properties. This book is compiled in collaboration by the Tajikistan and Pakistani scientists based on the result of research of organic semiconductors, properties of conductors and devices that are described in order to provide awareness and highlight the importance of this field of technology for future development of electromechanical sensors. This book is devoted to electric properties of organic semiconductors and conductors, organic pressure, displacement and strain sensors based on complexes and composites, including nanomaterials and will be useful to students, teachers, researches, engineers, technicians and to everybody interested in organic solid state electronics.