No abstract

The present study deals with the effect of the presence of cylindrical aluminum nanoparticles on the parameters of short circuit current density and absorption in the active layer of ITO/PEDOT:PSS/P3HT:PCBM/ZnO/Al organic solar cell by means of the Finite-Difference Time-Domain (FDTD) method. The nanoparticles are located in a hexagonal pattern inside the P3HT:PCBM layer and on its border with ZnO. During the simulation, the AM1.5 standard sun spectral pattern has been used in the spectral range of 300-1200 nm. Calculations have shown that the presence of nanoparticles causes a considerable improvement in the values of the parameters. This increase is especially noticeable in the range of high wavelengths. Given the results, when the nanoparticle height is changed, the optimal thickness is also changed, where the short circuit current density and the absorption have the highest values, in a way that at the heights of 50, 100 and 150 nm for nanoparticles, the P3HT:PCBM layer is optimal in the thicknesses of 150, 200 and 250 nm. These results are independent of the radius of nanoparticles. Comparison of calculation results in different conditions shows that both the short circuit current density and the absorption will have the highest values for 150 nm thickness of P3HT:PCBM layer and for nanoparticles with 50 nm height.

In this work, the effect of changing the dimensions of the layer structure on the collection of electrical charge carriers which been produced in the thin film composed of P3HT 1 and PCBM 2 that is between two electrodes, using the Monte Carlo numerical simulation with Bortez, Callus and Lebowitz algorithms, with checkered structure and different dimensions 60×15×5 sites, 60×30×5 sites, have been the conditions of the layers. At first, the average number of electrons and holes produced on the cathode and anode electrodes in two stages (simultaneous injection of excitons, without and with the presence of deep traps) was calculated and it was concluded that, by increasing layer width, the average number of electrical charge carriers collected on the electrodes has decreased, which has a direct impact on production of layer circuits and solar cell performance. Finally, the amount of external quantum efficiency of the layers was also calculated. In 60×15×5 sites layer, in two stageswithout and with the presence of traps -the average value of external quantum efficiency 52.3% and 42.43% was obtained and in 60×30×5 sites layer, the value of 42.43% and 37.9% was calculated.