All-organic thin film flexible photodetector based on C60modified PEDOT:PSS

In organic electronics, the use of self-assembled monolayer dielectric functional groups is considered an effective surface modification strategy that can significantly improve device performance. A flexible polymer (PEDOT:PSS) photodetector on the substrate polyimide with broadband response (450 nm similar to 980 nm) and high response (0.56 A W-1) is reported, which is superimposed on the surface by small molecule (C-60) thermal evaporation. In addition, the planeness of the organic semiconductor and the overall performance of the organic thin film photodetector can be improved significantly by using a small molecule modified polymer thin film; the photocurrent,R(i)and external quantum efficiency were all increased by more than 10%. The response time of the device reached an astonishing 5.87 ms, much faster than that of similar devices. The response of the small molecule modified organic device is improved by an order of magnitude, which provides a guarantee for better application of organic thin films in circuits. Moreover, the device has a strong flexible stability performance, which can meet the requirements of flexible stability for future photoelectric devices.