Fabrication And Optimization Of Organic Solar Cell Based On Novel Organic Cathode Inter Layer

Organic photovoltaic is a green-energy technology which has considerable potentials in the future. Compared to regular inorganic solar cell, they possess the potential advantages, for example, light weight, low cost and large-area production. As an highly important component of the organic solar cell, the cathode inter layer plays a crucial role in the energy band matching, selective collection and effective transport of charge carrier. The present work introduced new cathode inter layer materials.New blending additive. The self-organization of the material in the devices of inverted structure has been performed successfully, ternary blend can directly form films on the surface of substrates by spin coating. During the spin coating, PCBDAN spontaneously migrates and aggregates at the bottom of the active layer. The result of the performance shows the device works well and PCBDAN has formed a reliable and effective cathode inter layer. The contact angle measurement and the result of surface energy of different materials has shown that the difference between the surface energy has been the driving force of the self-organization. The self-organization behaviour has been proved by fabricating devices with separate inter layer and devices using amine-based conjugated polymer as additive. The PCBDAN is considered to be the first additive which can be applied in inverted devices.New n-doped fullerene derivatives. The fullerene derivatives are found to be self n-doped and the films are capable of being highly conductive in high thickness. Early characterization has revealed the materials show good solvent resistance, the films maintain their thickness after being rinsed by solvents and PCBDANI is the best among them. The fullerene derivatives are used as cathode inter layer in inverted devices. When the film made from PCBDANI is82nm thick, the solar cells still show an efficiency of3.48%. It shows good capabilities beyond that of any ever published cathode inter layer.Further tailoring the molecular structure and optimizing the fabricating technology could lead to the success of the manufacturing devices both in wider range of thickness of films and larger size.