This class will give an introduction to organic semiconductor (OSC) materials and pros/cons of each chemistry type: P-type,N-type, Polycrystalline OSCs, Polymeric OSCs and OSC blends. It will also cover the Performance of OSCs/OTFTs over the past 10 years. It will provide a Comparison between OTFTs and inorganic TFTs (α-Si, metal oxide, LTPS). Formulation and printability of OSCs. Some protype examples using OTFT. Finally it will cover Organic Semiconductor Technology roadmap and hurdles to be overcome.