Chemical Vapor Deposition Synthesis Of Nanostructured CdSe, Sn And Their Performance Study

The application of nanostructured materials in photodetection and energy storage hasbeen investigated in this paper. The1D CdSe nanowires on Si substrate, Sn microspheres oncarbon cloth were synthesized by a facile chemical vapor deposition method, respectively.After the reaction, the two kinds of product were characterized by XRD, SEM, TEM, EDS,exhibiting that they were all pure and single crystal. Then, devices were fabricated and tested.The main contents and conclusions are summarized as follows:(1) Organic-inorganic hybrid photodetectors based on P3HT:CdSe NW film were firstfabricated on rigid substrates. Compared with photodevices fabricated by using only CdSeNW and P3HT films, the hybrid photodetector showed a greatly enhanced photocurrent, afast response and a recovery time shorter than0.1s. The excellent performance results fromthe unique features of organic-inorganic hybrid devices by combining the relatively lowionization potential of the organic molecules and the high electron affinity of inorganicsemiconductors.(2) Flexible hybrid photodetectors were also first fabricated on both PET(poly ethyleneterephthalate) substrates and printing paper. Besides of keeping the good photodetectiveperformance as on Si substrate, flexible hybrid photodetectors shows excellent mechanicalflexibility and electrical stability. The flexible devices are successfully operated underbending up to almost180°and show an extremely high on/off switching ratio(larger than500).(3) Directly configured as a binder-free anode material for lithium-ion batteries, theas-grown three-dimensional tin microspheres/carbon cloth integrated anode exhibitedexcellent performance for lithium storage with high capacity of more than800mAh/g evenafter75cycles, as well as good cycling stability and rate capability. The goodelectrochemical performance can be ascribed to the microsized spheres with appropriate sizeand structural symmetry balancing the force of lithium insertion/extraction process, as wellas the binder-free integrated anode structure enhancing the electrical conductivity andenlarging available reaction surface.(4) Full cells were also fabricated based on the Sn microspheres/carbon cloth integratedanode, which showed similar performance with the half cells. Moreover, full cells exhibited high thermal stability and low self-discharge rate.