We present an overview of opto-electronic characterization techniques for third-generation solar cells, including photo-induced charge extraction by linearly increasing voltage, impedance spectroscopy, transient photovoltage, charge extraction and more. Guidelines for the interpretation of experimental results are derived based on charge drift-diffusion simulations of solar cells with common performance limitations. We discuss nonidealities like charge injection barriers, traps and low mobilities among others and their signatures in each of the studied cell characterization techniques. Moreover, comprehensive parameter extraction for an organic bulk-heterojunction solar cell comprising PCDTBT:PC70BM is demonstrated., Presenter: Martin Neukom