Abstract
We report a flexible photoresponsive organic field-effect transistor, phototransistor (OPT), based on a fluorinated copperphthalocyanine (F16CuPc) and polymer gate dielectric on a flexible polyimide substrate. Under light illumination, the device exhibited a photoresponsivity of 2.15mA/W at VGS=2V and optical power of 5.66mW/cm2. The current ratio (Iphoto/Idark) of the light to dark states was calculated to be around 300 at VGS=2V. Furthermore, the switching time of the phototransistor was found to be lower than 0.1s. When the substrate was bent outward up to a bending radius of 4.4mm, the device still showed photoresponsive field-effect characteristics. However, the photoresponsivity and Iphoto/Idark ratio decreased with decreasing bending radius. These results indicate that the present flexible OPT could potentially be used in optoelectronic device applications.
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