Study On The Interfacial Electrical Properties Of Thin Film Device Based On Two Kinds Of Organic Materials

With the rapid increase of the world population, energy crisis and environmental pollution are growing seriously worse. Using organic materials with excellent performance and low-cost to fabricate devices with high efficiency is the goal pursue of all scientists for a long time.The paper starting with the characteristics of organic materials, take organic solar cell for example, it introduces the typical structures of the organic solar cell. It elaborates its work principle and process of opto-electrical transformation, including the main parameters and the factors that affect the efficiency of the devices. We then analyze the electrical characteristics of the interfacial between the organic layer and electrodes in the prototype device of organic film device.Theoretically, based on understanding the electrical characteristic of the interfacial between organic layers and electrodes of organic film devices, we simulate the current/voltage curves of some devices with different structures by matlab using Richardson-Schottky (R-S) thermal emission mode、 Fowler-Nordheim (F-N) tunneling model and Space-charge limited conduction (SCLC) model. These devices that we simulate include:use GaIn and Au as their cathodes and anodes respectively, functional layer is4AAPD or CN-4AAPD with thickness of50nm,100nm and150nm, and increase interfacial layer or SAMs between organic layer and electrodes. From the simulation result, we can find that: R-S model and SCLC model can be used to explain the carrier transport principle of4AAPD thin film device in high and low electrical field respectively, but F-N model is not fit to explain the carrier transport principle of4AAPD and CN-4AAPD thin film device.Experimentally, we mostly discuss the preparation method of organic thin film and the fabrication process flow of the device. We fabricate the devices with different structures that using organic materials TZ2and DDME as functional layer. Then measure the I-V curves of devices by electrochemical workstation, and find the switching phenomenon. In addition to, we also measure the UV-Vis absorption spectrum of organic materials in dichloromethane solvent, and characterization the surface morphology of organic thin film by SEM. It was find that, TZ2material can form a relatively dense thin film and switching phenomenonof the devices are quitely obvious, and we can also find switch phenomenon in DDME devices, but it occurs crystallization and agglomeration during the preparation process of thin film. Finally, we analyse the switch mechanism of the devices that fabricated by this experiment.Above all, we study the electrical characteristics of its prototype devices both in theory and in experiments, and obtain some interesting and useful results.It laid the some foundation for subsequent in-depth study...