Quantum dot (QD) based solar cells have emerged as one of the most promising low cost power generators owing to their easy bandgap tunability and solution processability. Recently, the power conversion efficiency (PCE) of QD solar cells has been expanded to ＞12% by the development of high-quality QD materials and device architectures. However, the fabrication of QD solar cells often includes tedious multiple layer-by-layer deposition (LbL) by solid-state ligand exchange (SSE), which has been a major obstacle to high-throughput processing. Development of pre-exchanged QDs which do not require LbL/SSE procedure will be beneficial for the view point of device fabrication. In this talk, the development of pre-exchanged n-type and p-type QD inks, and the fabrication of QD solar cell devices by direct coating method will be presented. Using these QD inks, the PCE of ~11% was achievable.