Organic photodetectors based on transparent electrodes for application in ultraviolet light detection

A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated. A transparent conducting polymer PEDOT:PSS coated quartz substrate instead of ITO coated glass substrate as anode is propitious to detect shorter wavelength ultraviolet light. As a result, the device shows a low dark current density, a high responsivity of 502 mA/W and a detectivity of 2.67×1012 cm Hz1/2/W which is illuminated by a 220 nm ultraviolet light with an intensity of 1.6 mW/cm2. Moreover, the performance of the PEDOT:PSS transparent electrode device is better than the semi-transparent Al electrode device electrode because of the higher transmittance and electrode properties.