Electrodeposition Of Dendritic Pbse Nanostructures And The Performance Of Photodetector

AbStract:Organic-inorganic hybrid devices have unique features and take advantage of both the organic and inorganic materials, making it have broad application in the photodetectors and solar cells. Hierarchical nanostructures have the advantage of high specific surface area, facilitation of the carrier transport and construction of nano functional network and so on, which will bring unique superiority to organic-inorganic devices prepared by mixing nano-dendrite PbSe material with P3HT. Among various preparation approaches, electrochemical self-assembly technique has the advantage of low-cost, high-efficiency and suitable for large-area production. Hence, we report here the reasearch work on the electrochemical self-assembly route of hierarchical dendritic PbSe nanostructures and corresponding characterization of photoelectric properties. The main conclusions obtained are as follows:(1) Hierarchical PbSe nanostructures have been controllable prepared via electrochemical self-assembly approach. Cyclic voltammetry test was used to investigate the electrochemical behavior of Pb-Se electrolyte system, the results indicate that the deposition of lead selenide can occur in a wide potential range and in accordant with the characteristics of induced co-deposition.The effcts of additives and add volume, deposition potential, pH, temperature, and salt concentration on the morphology and composition were also investigated. A possible mechanism for the formation of the dendritic nanostructures was concluded. Besides, the optimal synthesis conditions were taken at the salt concentration of5mmol/L, addition of tartaric acid with80mmol/L, deposition potential of-0.28V, the deposition tempreture of25℃and the deposition time of1800s.(2) Nano-dendrite structured lead selenide was systematic characterized. The morphology is regular hierarchical structure and the composition is ideal stoichiometric ratio. The high purity of the PbSe materials, with cubic structure, show good absorption performance in the range of visible and infrared light, and the bandgap is0.65eV. The organic-inorganic devices prepared by mixing with P3HT can broaden the UV-visible absorption within a short range and can effectively facilitate the separation of the carriers, thus obtaining a good photoelectric detection performance.