High response organic deep ultraviolet photodetector with PEDOT:PSS anode

We have fabricated an organic deep ultraviolet photodetector (PD) using PEDOT:PSS (PH 1000) as a transparent anode. NPB and PBD were employed as electron donor and acceptor, respectively. The PD exhibits a dark current of 0.0829 μA/cm2 and a photocurrent of 85.3 μA/cm2 at −12 V under 280 nm light illumination with an intensity of 0.488 mW/cm2. A high response at 248–370 nm with its peak of 0.18 A/W at 280 nm and a detectivity of 1.1×1012 cm Hz1/2 W−1 were achieved. The more detailed mechanism of harvesting high performance and the dependence of photocurrent density on illumination intensity are also discussed.