ABSTRACT
This chapter explores the investigations on fullerene-based organic photovoltaic (OPV), to elucidate the understanding of fullerene-based OPV regarding working principle, materials, morphology and operation stability. It provides an overview of OPV devices based on fullerene acceptor with the development history, the basic materials and device knowledge, the optimization of the device structure, morphology engineering and stability issue. Although nowadays the new star acceptor materials system is non-fullerene, which presents some advantages such as broad absorption spectrum, low energy loss, and good stability. In OPV, the quasiparticle species involved in the energy conversion process, with different energy states are identified as photon, exciton, interfacial hole–electron pair and free charge carriers. The performance of OPV device is generally evaluated using four parameters: Open-circuit voltage, Short-circuit current density, Fill Factor and power conversion efficiency.
