Abstract
In the future commercialization and development of organic solar cells, in addition to the improvement of power conversion efficiency, it is more important in terms of mass production and cost and stability. This thesis uses blade-coating process that not only can be combined with roll-to-roll process,but also applied on the device with active area of 216 cm2 and this feature is not necessary modularize a plurality of OSCs but complete the large-area OSCs in one process,therefore, the time and cost are greatly reduced. In addition to the large area of solar cells, this thesi successfully applied the solution- processed interlayer, achieving a high power conversion efficiency of 4.76% under the device structure ITO/PEDOT:PSS/PBDTTT-EFT:PC71BM/Liq/Al/Ag . In addition, the stability of the device has been greatly improved through the use of suitable interlayers Liq and ZrOx, and remained 65.8% and 68% of the initial PCE at a high temperature of 80°C for one month. In contrast, the traditionally thermal evaporated LiF interlayer has already declined to half of the initial PCE after three days at 80°C high temperature. Finally, we tried ZrOx doped by Liq. This purpose was to increase the initial PCE by the characteristics of the doped material, and the Voc was raised from 11.45 (V) to 12.2 (V) when the Liq was 3% of the ZrOx molar concentration, FF from 0.41 to 0.45 and PCE from 3.6% to 4.17%. Good results are also obtained in terms of stability, and 70% of the initial PCE is remained at a high temperature of 80°C for one month.