Effect Of Buffer Layer Based On Green Organic Photodiode On Device Characteristics

Organic photodiodes (OPDs) have many advantages such as organic materials, organic photodetection, image sensing, light control circuit, organic photodetection, organic photodetection, organic photodiodes, OPDs. , Optical communication and so has a good application prospects.The size of the light and dark current of the organic photodiode is a measure of the main parameters of the device, which is a performance index that takes into account the size of the light and dark current.The buffer layer is one of the important factors that affect the size of the device. Therefore, it is necessary to study the influence of the parameters such as the material, structure and thickness of the buffer layer on the optical and dark current of the device.In this paper, ITO / P3HT: PC61BM / A1 as the basic structure, first of all. the buffer layer parameters of the device on the impact of light and dark current.On the basis of studying the material properties,LiF, MoO3 and cCuPc were used as buffer layers for different functions of the anode / cathode, respectively.And its thickness on the device photogenerated current and dark current.Experiments show that the BCP as a cathode barrier layer, the dark current is almost reduced by 2 orders of magnitude, but the photocurrent is also significantly reduced;MoO3, CuPc as the positive buffer layer, LiF cathode buffer, the device's light current has improved, but the dark current also increases.The device's photocurrent has improved, but the dark current also increases. When the photocurrent is increased, the dark current also increases significantly. It is difficult to obtain the ideal light and dark current, to achieve high performance than the detection rate device.Based on the study of the properties and mechanism of the buffer layer, the composite buffer layer research scheme was developed based on the research results. The structure of Mo03 / CuPc, BCP / LiF and BCP / Mo03 composite buffer layers was proposed and studied experimentally.The results show that the dark and dark currents of MoO3 / CuPc and BCP / LiF are lower than those of the three kinds of composite buffer structures, and the detection rate is not improved obviously.BCP / MoO3 cathode composite buffer layer structure, the device under-0.5V bias, 3mw / cm2 green LED light, the dark current from the buffer layer when 2.43 x 10-5A reduced to 1.24×10-6A, lower 94.9%, the photogenerated current increased from 5.95x 10-5A to 2.51×10-4A, an increase of 422%. Than the detection rate from 7.12×109 increased to 1.33×1011Jones, an increase of 18.7 times.BCP / MoO3 can effectively improve the organic photodiode photocurrent, reduce the dark current, get the ideal light and dark current, improve the detection rate. For the development of high-performance organic photodiode provides the idea.