Abstract
This thesis uses the high efficiency organic solar materials, which is Poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5- b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2- carboxylate-2-6-diyl)] (PBDTTT EFT). Blade coating is used for the deposition of the active layer as it can achieve high material usage and is scalable to large area OSC in the future. The first part is using multilayered structure on PBDTTT-EFT organic solar cells, we hope we can improve the lifetime for the normal structure organic solar cells by adding interlayer to the top or back of the active layer. After 5832 hours continuous operating, the PCE remains 6.07%. The second part is changing the use of solvents on organic solar cells. In order to more environmental-friendly, the thesis manufactures high-efficiency organic solar cells by halogen-free solvents, such as Toluene, Xylene, NMP. We will observe the initial PCE and the lifetime after using the halogen-free solvents.