The Fabrication Of New Carbon-based Nano-materials And Its Research About The Infrared Photodetector

In recent years,the photodetector,based on the new carbon-based nano-materials,has become the hotspot of nano-photodetector,owing to its outstanding photoelectric performance,homogeneity and easy-to-film.And this photodetector fabricated by new carbon-based nano-materials gets the fast response speed,high sensitivity and high detectivity etc..Meanwhile,its wide range applications involve photoelectrics and electro-optics and practical application involve communication,military,illumination,energy,biology and other fields.Because of the advantages of new carbon-based materials,which has the better optical and electric properties and low-cost,the attentation about application on photodetector is more and more.Howerer,the new carbon-based nano-materials still exist many shortcomings today,which the absorption still is low at infrared and mainly covers visible for fullerne-based materials,the absorption is low and dark current is high for single layer graphene and carbon nanotube still have larger pipe diamater,low density and many defects in the tube wall.Thus,this paper takes some deals for those problems,which improving the optical properties of fullerene materials make raise the photoelectrical performance,and the numbers of graphene layer is increased for increasing the absorption and preparation of new mutilayers grahene is for decreasing the dark current and high performance infrared detectors.While the nature of carbon nanotube cause the research materials is just for the fullerene and graphene.The new carbon-based nano-film was prepared by sping coating method in this paper,and its morphology and structure is characterized by transmission electron microscopy(TEM),atomic force microscope(AFM),Leica optical microscope,its molecular structure and chemical bonding analysis is tested by Raman specturmm,fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscope(XPS)etc.,its optical properties is tested by UV-Visible spectrum,fluorescence spectrum(PL?PLE),ellipsometer(EPS),and its electrical performance is characterized by Hall testing.The dominating contents and conclusions are following:(1)By the p type doping in the fullerene with iodine,the photo-energy of motivating the pair of electron-holes is decreased to enhance the absorption at the light with lower energy,the response frequency band is wider and the all absorption and the responsivity for infrared respectively are enhanced by 31.3%and 1.1×104 times;(2)the modulation of hybridization between the graphene quantum films and amorphous carbon can control the optical and electrical properties of new mutilayers graphene,and the high comprehensive performances device was fabricated,its responsivity(R)reaches 400 AW-1,detectivity(D*)reaches up to 8x1015cmHz1/2W-1.