The development of high performance, thin and flexible light and radiation sensors for real-time detection of ionizing radiation at affordable cost is of interest in many application areas, ranging from medical diagnostics and therapy to astrophysics, high energy physics and industrial testing, including civil radiation protection.The use of organic semiconductor technology could meet the requirements of large area, conformability and portability, light weight and low power operation.In the field of organic photodetectors, phototransistors (OPT) have gained significant attention due to their ability to combine high sensitivity, switching function, and intrinsic amplification without noise problems in a single device, thus allowing significant simplification of the external signal conditioning circuitry [1].The operation of an OPT under light illumination is governed by the trapping of minority carriers, resulting in a reduction of the …