Study On Photoelectric Properties Of Graphene Film

Graphene, a single layer of graphite, has an ideal two-dimensional structure of honeycomb. The unique structure and a lot of excellent performance make graphene turn into a hot spot in the study of science. The light quality, strong electrical conductivity, excellent strength, high transparency and significant optical performance make graphene suitable for the use in micro/nano electronic devices photovoltaic field and optoelectronic devices widely. Especially, its high electron mobility is about 100 times than silicon’s. But graphene is concerned as a kind of zero-gap semiconductor and do not show significant optical transition in the visible light range, thus characterization technique were limited. Therefore, the preparation of high quality graphene sheets is a crucial step for graphene photoelectric properties applications due to graphene the characteristic in this article.The best parameters of prerared graphite oxide (RGO) are obtained by single variable exploration methods and X-ray photoelectron spectroscopy (XPS), Optical microscope, Fourier transform infrared spectrum (FT-IR). Such as ultrasonic time of 14 h, ultrasonic power of 60%, solvent of deionized water, concentration of 0.2 mg/ml, graphene oxide (GO) capacity of 0.02 ml, heat treatment temperature of 900℃, electrode thickness of 390nm, and electrode material of Ti-Cu-Ti.The thermal reduction method is used in this paper. With temperature increasing, the reduction samples transmittance after reduction gradually increases, and the coating structure improved greatly from the unreduced. Concluded as follows by using the Optical microscope, XPS, and FT-IR. analysis tools:the O-C=O bond, C-O bond, and the C= O bond content of the reduction graphene oxide (RGO) increases with temperature decrease in order. Carbon-to-oxygen ratios increases in order, and finally reaches 8.9.Finally, the RGO photoelectric response properties and Ⅰ-Ⅴ characteristic curve of graphene films obtained by the optimum process parameters are studied. The results show that the photocurrent generated in the visible light is much larger than the dark current. Generated photocurrent under red light is greater than a photocurrent generated under the green light. The maximum photocurrent is 72uA while dark current up to 43uA under the 3V voltage. Graphene films on visible light absorption characteristics contributing to the development and application of photovoltaic energy conversion.