Improvement of Conversion Efficiency of Inverted Organic Photovoltaic With PEDOT: PSS:WOx by Thermal Annealing

We report the effects of postannealing on the photovoltaic performance of ITO/LZO/P3HT:ICBA/PEDOT:PSS: WO_x/Al. The electrical characteristics of the PEDOT:PSS:WO_x film can be controlled through an annealing treatment, which exhibits a short-circuit current density of 9.37 mA/cm², an open-circuit voltage of 0.86V, and a power conversion efficiency of 5.54% under AM1.5 illumination (100 mW/cm²). By annealing the device at 150°C, a favorable phase separation in the PEDOT:PSS:WO_x is obtained, and the PCE increases by 23.27% compared with that of the nonannealed device. The V_oc increases with the annealing temperature, and it is worth noting that the PEDOT:PSS device only experienced a 2.40% decrease in PCE after 150°C annealing treatment.