The 2D materials family has been ever-growing to thousands of members with different electronic properties, from metals, semiconductors, insulators to superconductors. Solution-p rocessable two-dimensional (2D) van der Waals thin films have drawn extensive attention for next-generation printable and flexible electronics due to their superior charge transport properties and cost-effective facile processes. However, the characteristics of solution-processed CMOS circuits and other electronic devices composed of n-type and p-type TFTs with van der Waals films are still in their preliminary stage compared to the great expectations. A better understanding of the transport properties in the intra-flake and inter-flake, and the interface properties between different functional 2D materials in thin films, could offer rational design strategies to realize high-performance devices, and hence for van der Waals integration. Below are a few examples of the current and future research interests of our group: