Abstract
Using SAM (self-assembly monolayer) to modify the work function of anode in organic solar cells was studied in this research. The SAM material, terminated with fluorine or methyl group, corresponds to the forward or backward dipole. We investigated the influence of SAM length on the I-V characteristics of devices, considering SAM an insulator. Besides, Au was chosen to be the semi-transparent anode because of its good conductivity and easy attachment to alkanethiols, which is the other termination of the SAM. The optimal thickness was calibrated to have contact resistance of 5Ω/cm and optical transmittance of 74%. Finally, we fabricated devices with different SAMs substrates (Au and ITO) and compared the performance.