Preparation Of Copper Nanowires And Applicantion In Organic Solar Cells

Organic solar cells have obtained considerable attention in the past years because theyhave many advantages, such as low cost, low temperature processable, mechanical flexibility,production by roll-to-roll and vacuum-free coating processes. Usually, the electrode materialin organic photovoltaic device is ITO, which has many limitations such as high cost andfragile. Metal nanowires can realize the advantages of flexibility for mass production withlow cost and easy preparation. Therefore, how to explore a simple synthesis route topreparation of copper nanowires is of great significance. The main contents are as follws:Firstly, using the method of hydrothermal growth Cu NWs in surfactant PVP, structureunder the action of revulsant EDA, through different experimental parameters (temperature,time, concentration of reagents, etc.), the influence of copper nanowires morphology, and theproduct characterization of XRD, SEM and TEM, the resulting Cu NWs length of about10μm, diameter of about200nm. Come to temperature, reactant concentration andstructure-directing agent EDA is a key factor affecting the morphology of the product. Theoptimization of the Cu NWs with PEDOT: PSS mixture as an anode buffer layer devicestructure were prepared: ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al and ITO/PEDOT:PSS:CuNWs/P3HT:PCBM/LiF/Al photovoltaic devices. The results show that compared with thereference device performance has decreased, may be the reason is mainly due to the Cu is itseasy to oxidation, join the PEDOT: PSS after the surface roughness, is not conducive to holetransmission and collection, at the same time easy to capture carrier, make the deviceperformance.Second: in order to solve the Cu is susceptible to oxidation, in hot water preparation ofCu is on the basis of preliminary explored in a layer of nickel, copper surface parcel is thepreparation of copper nanowires (Ni-Cu NWs) to avoid this problem, explores respectivelyusing two step growth method and step of of Ni-Cu NWs, product by observing the SEMfigure, sums up the preparation of length to diameter is larger Ni-Cu NWs method. On thebasis of the preparation of the device structure is respectively: ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al and ITO/PEDOT:PSS:Ni-Cu NWs/P3HT/PCBM/LiF/Al photovoltaic cells,The experimental results show that when mixed with certain concentration of Ni-Cu NWsdevice performance after the overall downward trend, that doped Cu NWs after did not play apositive role in the buffer layer.