This lecture covers the transport and recombination processes in large area electronic materials, focusing on topics such as recombination in dangling bonds, charge state representation, recombination in doped and undoped a-Si:H, total recombination, dark conductivity, primary and secondary photoconductivity, defect density, trapping conduction, and transient photoconductivity. The instructor discusses various characterization techniques, including steady-state photoconductivity, constant photocurrent measurement, and transient photocurrent spectroscopy, highlighting the importance of understanding recombination mechanisms in different semiconductor materials.