(B) and (C) are the schematic bang energy level diagram and charge-transporting processes in conventional and inverted OSCs, respectively. (A) Schematic of the device structures of conventional and inverted single-junction OSCs with an anode interface layer (AIL) and cathode interface layer (CIL). In addition, selecting the appropriate device structure is crucial.įigure 2.9. These electron and hole transport layers also block the carriers to reach the opposite electrodes. 2.9), are generally inserted between the BHJ active layer and electrodes. To reduce the ohmic contact resistance at the electrode (cathode and anode) interfaces, additional carrier transport layers, such as electron transport and hole transport layers with suitable work functions to match the energy levels of donor and acceptor materials ( Fig. They also include interface engineering to enhance the carrier collection probability at the electrodes. Other key factors include the electrical, optical, and structural properties of the organic photoactive materials. Usually, narrow optical bandgap materials have a wider absorption range of solar spectra. Donor/acceptor materials can be divided into three categories based on their optical bandgap: (1) narrow bandgap material (2) medium bandgap material and (3) wide bandgap material. Several key factors influence OPV cell efficiency.
0 kommentar(er)
