Dissertation > Excellent graduate degree dissertation topics show

Properties of small organic molecules photodiode based on ZnO nanowires

Author: MaWenMing
Tutor: YuJunSheng
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: Chemical hydrothermal technology ZnO Nanowire arrays Organic - inorganic heterojunction Photodiode
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
Read: Download Dissertation

Abstract


Preparation of semiconductor nanomaterials as well as their physical and chemical properties has aroused great concern, and the reason is because such materials generally have very significant quantum effect, surface effect, the size effect and special electronic conduction effect unique properties. Direct band gap semiconductor compounds as a wide band gap materials, zinc oxide (Zinc Oxide, ZnO) band gap of 3.37 eV at room temperature reaches up to 60 meV exciton binding energy, its chemical and physical properties of the fine . Among the research field of semiconductor nanomaterials, ZnO nanomaterials has become one of the largest research hotspot. The past 20 years, organic - inorganic heterojunction has a very attractive prospect in the field of electronics and optoelectronics, causing great concern for researchers in the scientific community. This particular structure, by using an inorganic material having a high carrier mobility and high absorption coefficients of the organic semiconductor material is combined, it will greatly improve the performance of the device. The special structure of the device, on the other hand, can usually be performed by a low-cost solution method to be prepared, which makes the structure have the huge advantage in the cost. The paper in order to make further in-depth study of the hot issues based on ZnO research areas, the use of chemical method, successfully prepared ZnO nanoparticles and ZnO nanowires (Nanowires, NWs) array, and on this basis, based on ZnO nano - Preparation of small organic molecules mixed photodiode (Photodiode) and photoelectric properties. Specific research contents are as follows: (1) the use of chemical hydrothermal technology to prepare high-quality ZnO nanoparticles (Nanoparticles, NPs), and its structure by SEM (Scanning electron microscope, SEM), XRD (X-ray diffraction, XRD) and morphology characterized by UV - visible absorption spectrum (Ultraviolet-visible absorption spectrum, UV-Vis) and photoluminescence spectra (Photoluminescence, PL) test showed that ZnO nanoparticles with good optical properties. (2) the use of chemical hydrothermal and annealing processes were successfully prepared ZnO Nanowire Array on ITO substrate. And does not use any form of the catalyst, in the experiment in order to avoid introducing a new impurity defects. For the preparation of samples, we tested its characterization means of SEM, XRD, PL and UV-Vis, we found from the test results of ZnO nanowire arrays with a very good crystalline quality and morphology Meanwhile, we also found that the ZnO nanowire arrays room temperature emission bands, each with a green and ultraviolet region has unusually excellent optical characteristics. ZnO nanowire arrays grown by chemical hydrothermal technology, and take advantage of the vacuum evaporation technique, small organic molecules deposited on ITO as a substrate of ZnO nanowire arrays using Ag as the anode (3), assemble the most basic organic - inorganic heterojunction structure of ZnO nanowire photodiode. IV characteristics of test instruments produced of ZnO nanowires photodiode IV characteristics test analysis, the results showed that the photodiode good rectifying characteristics to achieve the basic requirements of the photodiode applications.

Related Dissertations

  1. Research on Signal Receiving System of Phase Laser Range Finder,TN249
  2. Study on the Chimisorption Removal of FCC Gasoline Sulfur Compound,TE624.55
  3. Preparation of ZnO -based microemulsion photocatalytic material,O614.241
  4. Influence of Doping Effect on Zinc Oxide by First Principles Studies,O614.241
  5. Fabrication, Defect Manipulation and Optical Properties of ZnO Hybrid Materials,TB33
  6. Preparation and Characterization of Multifunctional Fe3O4/ZnO/SiIO2 Nanocomposites,TB383.1
  7. Hydrogen Evolution Process of Water Electrolysis Assisted by TiO2 Nanotubes and TiO2/ZnO Nanorodes Assembled on Ni Substrate,TQ116.21
  8. Study on a New Novel Avalanche Photodiode for Suppression of Edge Pre-breakdown,TN364.2
  9. Portable spectrophotometer Circuit Design,TH744
  10. Nano- Pd catalytic oxidation of formic acid,O643.32
  11. Sol - gel method p -type ZnO films,O484.1
  12. Synthesis and Characterization of ZnO Films by Ultrasonic Spray Pyrolysis,TB43
  13. Research of ZnO Thin Films for SAW Resonator,TN304.055
  14. Study on the Preparation and Doping Y2O3 of Low-voltage ZnO Varistor Ceramics,TN304.93
  15. Doped ZnO thin film magnetic materials Preparation and magnetic properties at room temperature,O484.1
  16. The Exploration on Electroluminescence of ZnO Thin Films,O484.41
  17. Synthesis of ZnO Crystals by Chemical Vapor Transport Method,O484.1
  18. Preparation, Characterization and Photocatalytic Properties of a Novel Nano-ZnO,X703.1
  19. An Approach to Study the Protective Performance of Nano ZnO, TiO2 Modified Bamboo,TS652
  20. Eutectic ionic liquid solvent-based system to take the study of metallic zinc from zinc oxide,TF813
  21. One-dimensional ZnO semiconductor nanowires and field emission properties of,TB383.1

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile