The Synthesis Of Asymmetric Perylene Diimide And Its Application In Photovoltaic Devices

As a new type of green energy with low cost and no pollution,organic solar cells have attracted wide attention.At present,the efficiency of the device prepared by the laboratory has exceeded 10%,which is of great significance for the further industrialization of production.However,there are still some problems in further large-scale application: First,the device of the cathode interface material thickness of about 30 nm in the laboratory,but it is difficult to produce uniform and no defective film through industrial production;Another problem that is that the laboratory's more efficient devices are using fullerene derivatives as electron acceptor materials;However,the fullerene derivatives have high cost.To solve these problems,this paper mainly studies the following two aspects:1.For the first problem,my group proposed the concept of photoconductive cathode interlayer,PBI-H was doped into ZnO at 1% concentration,and the effect of interface thickness on device performance is investigated.In this paper,a novel asymmetric PBI molecule containing both alkyl chains and NH groups is synthesized.The presence of alkyl chains inhibits the self-aggregation of molecules,and the NH groups form ZnO-N and the bond is advantageous for obtaining a homogeneous doping system.The hybrid of ZnO:PBI showed high photoconductivity under visible light irradiation and the thin films were applied as photoconductive cathode interlayers in the inverted PSCs to achieve high performance devices even though the thickness of the interlayer was 100 nm.2.For the second problem,we synthesized a PBI molecule with bay asymmetric,the bay asymmetric molecular side rigid biphenyl group,the other side is phenyl substituents,and imide positions for NH groups,we study the application of asymmetric molecules as non-fullerene acceptor materials in photovoltaic devices.Non-fullerene acceptor material can effectively reduce the cost relative to fullerene materials.Because of the chiral structure of the molecule,the spherical aggregates are formed by the interaction of the intermolecular hydrogen bond with the ?-? interaction.Because of the existence of rigid biphenyl,the energy loss caused by the change of configuration is reduced during the electrons injection and extraction,this is beneficial to improve the efficiency of the device.