Organic Semiconductors in Sensor Applications Organic semiconductors offer unique characteristics such as tunability of electronic properties via chemical synthesis compatibility with mechanically flexible substrates low cost manufacturing and facile integration with chemical and biological functionalities. These characteristics have prompted the application of organic semiconductors and their devices in physical chemical and biological sensors. This book covers this rapidly emerging field by discussing both optical and electrical sensor concepts. Novel transducers based on organic light emitting diodes and organic thin film transistors as well as systems on a chip architectures are presented. Functionalization techniques to enhance specificity are outlined and models for the sensor response are described. Organic semiconductors offer unique characteristics which have prompted the application of organic semiconductors and their devices in physical chemical and biological sensors. This book covers this emerging field by discussing both optically and electrically based sensor concepts. Novel transducers based on organic light emitting diodes and organic thin film transistors as well as systems on a chip architectures are presented. Functionalization techniques are also outlined.