On the tendency of temperature and electric field dependences of interface recombination in a P3HT:PCBM organic bulk heterojunction solar cell

摘要

We demonstrate theoretical explanation of tiie temperature and electric field dependences of recombination coefficients in an organic P3HT:PCBM bulk heterojunction solar cell. Based on the model of interface recombination, two analytical formulas describing the relative ratio of the interface (yi) to the Langevin (j_l) recombination coefficients have been derived. Our analysis indicates that the sign of parameters Φr and ΦF determines the increasing or decreasing of yi/Yl with temperature and electric field. We have obtained satisfactory agreement between theoretical calculations and experimental data. Additionally, the presented model is capable of explaining, for the first time, the fact that the ratio of the experimental recombination coefficient with sum of charge carrier mobilities increases with electric field.