Progress in the synthesis of poly(3-hexylthiophene) -- Morphology of P3HT in Thin Films in Relation to Optical and Electrical Properties -- Epitaxy: a versatile method to orient and nanostructure P3HT -- P3HT and other polythiophene field-effect transistors -- Morphology and charge transport in poly(3-hexylthiophene): A theorist's Perspective -- P3HT-based solar cells: Structural properties and photovoltaic performance.