Trap States Ruling Photoconductive Gain in Tissue‐Equivalent, Printed Organic X‐Ray Detectors

Organic semiconductors are excellent candidates for X-ray detectors that can adapt to new applications, with unique properties including mechanical flexibility and the ability cover large surfaces. Their chemical composition, primarily carbon hydrogen, makes them human tissue equivalent in terms of radiation absorption. This is a highly desirable property dosimeter be employed medical diagnostics therapy, however low-Z composition limits absorption ionizing radiation. The detection efficiency enhanced by considering photoconductive gain (PG) effect, significant contributor mechanism this class materials. In work, process controlled solution deposition nozzle printing crystallization an organic semiconductor thin film demonstrated whereby flexible, arrayed thin-film detector record sensitivities among flexible (S = (9.0 ± 0.4) × 107 µC Gy−1 cm−3) developed. excitonic peaks responsible activation PG effect investigated identified using novel technique called photocurrent spectroscopy optical quenching, analysis changes trap states further demonstrated.