This book explores the required characteristics of the components present in an organic photovoltaic device, such as transparent electrodes, electron- and hole-conducting layers, and electron donor and electron acceptor materials. It discusses the design, preparation, and evaluation of these materials targeting the highest performance. Taking into account the necessity to optimize many interdependent parameters, the text describes the integration of various components using existing as well as innovative device architectures suitable for mass production. Finally, it assesses the technical feasibility and economic viability of the large-scale manufacture of materials and resulting devices.