The Study Of The Effect Of PEDOT:PSS Doped With Metal Salts On The Performance Of Organic Photovoltaic Cells

Organic photovoltaic cells (OPVs) is considered to be the most potential of photovoltaic devices and one of the main research directions of the field of renewable energy. Because it has many advantages, for example, low cost processing, high visible light transparency, large-area films manufacturing compatibility, simple and flexible fabrication. However, now the power conversion efficiency of the organic photovoltaic cells has big difference with the inorganic photovoltaic cells, and the large-scale commercial production of OPVs is impossible. Therefore,improve the OPVs' power conversion efficiency and stability is the emphasis of the researchers from all over the world. In this paper, the power conversion efficiency of OP Vs based on poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C6i (P3HT:PCBM)was enhanced by the addition of metal salts to poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS), and the effects of PEDOT: PSS doped with different metal salts on the performance of OP Vs, including the different doping concentration, different annealing temperature on the impact of OPVs were studied.1. The importance of PEDOT: PSS as the anodic modified layer was studied firstly,then the doping ratio of the metal salts was optimized, and it turned out that the performance of the device was the best when the ratio of the metal salts to PEDOT: PSS was 0.1:1. In this paper, PEDOT: PSS doped with lithium chloride (LiCl), lithium bromide (LiBr) and lithium iodide (LiI) respectively, When the PEDOT: PSS doped with lithium chloride, the device has the best performance, the power conversion efficiency of the devices, which showed an upward of 34.4%, increased from 2.12% to 2.85%.2. The effects of different doping concentrations on the OPVs were studied. The study used 5 different doping concentration: 0 mg/mL, 5 mg/mL, 10 mg/mL, 15 mg/mL and 20 mg/mL. It turned out that the performance of the device was the best at 10mg/ml where the efficiency of the solar devices were increased from 2.17% to 2.89%,increasing by 33.2%. Then, the film morphology of PEDOT: PSS and P3HT: PCBM were studied. The roughness of PEDOT: PSS film was increased froml.37 nm to 2.78 nm after doping, and the roughness of P3HT: PCBM was decreased from 5.11 nm to 4.86 nm.3. The effects of different annealing temperatures on the performance of OP Vs based PEDOT: PSS doped with lithium chloride was studied. In this paper, the annealing temperature of 50 ?, 100 ?, 150 ?,200 ?,250 ? were used,when the annealing temperature was 150 ?, the power conversion efficiency of solar devices reached the maximum, the power conversion efficiency rose from 2.52% to 2.92%,increased by 15.9%.