ABSTRACT
This chapter describes the strategies to improve the performance of organic solar cells (OSCs). Firstly, we review the history of OSC development and recent research progress. The working mechanism, device structure, and the efficiency of OSCs are explained in the first part. Plasmonic effect is a simple and effective way to enhance the absorption of active layer. The plasmonic nanostructures could be placed in the active layer or the charge transport layer. Interface engineering is another strategy to optimize the energy-level and charge transport property. The interface materials could be metal oxide, graphene oxide, conjugated polymer, or small molecules. In addition, we present the ternary solar cells which increase the absorption regions and improve the device performance through charge transfer, energy transfer, and parallel or alloying working mechanism. Finally, the challenges and opportunities for OSCs in the future are summarized.
