Semiconducting nanocrystal quantum dot (QD) have attracted a lot of attention as a next-generation solar cell material due to possibility of band gap engineering and increasing the power conversion efficiency (PCE) beyond the conventional Shockley-Queisser (SQ) limit utilizing multiple exciton generation (MEG) processes. In recent years, moreover, research related to the various architecture of the solar cell and the surface treatment techniques of QD is reported the development rate of the PCE has also sharply increased. Especially, colloidal QD sample allow the solution process that provide flexibility in engineering design to reduce the manufacturing cost than silicon (Si) solar cells existing.However, aside from low PCE than Si based solar cells, it is still difficult to industrialization of QD solar cells. That is, all solution process that can contribute to the reduction of process costs can be lowered power generation bids to offset the low PCE is still impossible. For typical example, most of the layers comprising QD solar cell except QD layer usually have been prepared by vapor deposition techniques. In particular, some buffer layers such as lithium fluoride or molybdenum oxide have sometimes been employed for well charge separation and transportation in conjunction of QD solar cell with electron or hole accepting electrode, it is not easy to be applied the solution process to form a buffer layer unlike other transparent conductive oxide (TCO) layer on glass substrate. Therefore, it is essential to secure the proper buffer layers which is not only compatible with both QD and carrier accepting electrode but also enabling all solution process that provide in the true meaning of low cost with large area QD solar cell. In this report we demonstrate all solution processed lead sulfide (PbS) QDs solar cell modules having a layered by layered architecture with very large active area. The solution processable p3HT layer was adopted as buffer for electron blocking from QD to silver electrode. In addition, soft polymeric P3HT layer shows good contact with other layers, and also protecting QD layer during coating process of PEDOT:PSS that contains sulfonic acid can lead the degradation of QDs. Flexible solar modules based on these structures exhibit promising power conversion efficiency under AM 1.5 conditions