Abstract
Using roll-to-roll fabrication process to produce organic solar cells is the future trends. To achieve this goal, an appropriate flexible substrate is needed. Most of the flexible OPVs reported to date have been fabricated on plastic substrate. In our work, we introduced general household aluminum foil as flexible substrate due to their effective protection against penetrating moisture and oxygen as well as formation of low-cost, robustness, and good thermal stability. By insulating and smoothing the surface of aluminum foil substrate, we successfully made a device which used thin silver film as transparent electrode. However, the transmittance of thin silver film is too low, we used transparent electrode ITO instead. For this purpose, we developed lamination process combined with Al-foil and ITO-glass substrate. On the other hand, one critical issue in lamination process is how to choose the conducting polymer layer as electronic glue. In our selectivity of the conducting polymer layer, PCE is obtained 2.59% via the addition of D-sorbitol to PEDOT:PSS(AI4083) firstly. Then, we showed the significant advances in PCE by replacing D-sorbitol with PEDOT:PSS(CPP105D). The optimization of PCE is 3.05%, and achieved 3.2% after electrode treatment. Our research represents a combination of metal-foil substrate and lamination technique which can be used in roll-to-roll manufacturing.