Executive Summary : | Medical technology has evolved to utilize various high power sources for diagnosis and treatment, including x-rays, NIR, and UV light beams. UV radiation, particularly in the UV-B region, has potential in skin treatments but must be used in controlled fashion to avoid lethal damage. High precision photodetectors are needed to monitor and signal output variations. Inorganic materials have excellent responsivity in this field, but the modern medical industry seeks flexible, skin-friendly, wearable devices. Organic systems are often recommended due to their ease of fabrication, tailorability, and low material costs. To address issues like improving responsivity, reducing dark current, and narrow band detection, a novel dual layer architecture is proposed. This architecture reduces dark current, improves exciton dissociation, and efficiently collects charges. Three major device engineering concepts are proposed: using dual crystal-thinfilm layers as active medium, dual dielectric layers with low and high dielectric constant combinations, and an metal oxide interlayer between the contact electrode and semiconductor layer. The device will be fabricated on a flexible plastic substrate like PET, making it directly suitable for wearable technologies. The three-terminal phototransistor offers in-device charge transport control and amplification, while the metal oxide interlayer reduces energy mismatch between Au metal contacts and the HOMO of the active medium. |