The Test On The Photoelectric Performance Of SnO₂Quantum Dots/ZnO Composite Film

Wide band gap semiconductor material is also referred to as third-generationsemiconductor materials, compared with the first-generation and second-generationsemiconductor materials, it has a large band gap, high saturated electron drift velocity,small dielectric constant and conductivity, so it has great prospects in many areas. Zincoxide is a wide band gap semiconductor it’s band-gap and exciton binding energy is3.35eV,60meV at room temperature, tin dioxide is also an important inorganic chemicalraw materials, which belong to the traditional wide band-gap metal oxide semiconductormaterial,It is one of the important novel semiconductor materials used in the field ofintelligent.Specific contents are summarized as follows:1. SnCl4·5H2O and triple distilled water are used for the of synthesis of SnO₂colloidquantum dot and its corresponding powder particles by a simple sol-gel combined withhydrothermal method. The structural and optical properties of these SnO₂particles areinvestigated using X-ray powder diffraction, transmission electron microscopy, UV-visible absorption, and photoluminescence spectroscopy.The size of the quantum dots, theenergy gap, the analyzes of the different synthesis conditions and the fluorescenceluminescence mechanisms are also discussed.2. The laboratory-made nano-ZnO slurry is printed on the alumina ceramic substratewith printed gold electrodes。Then nine kinds of stannic oxide colloidal quantum dots aredripped to the oxidation zinc oxide thin film with low-temperature drying to form theSnO₂quantum dots/ZnO bilayer membrane composite system. The composite flim arecharacterized by FSEM and EDS spectrum3. We use laboratory-made optical test platform to test the photovoltaic performanceof the composite film and the single layer of zinc oxide film with the condition ofdifferent atmosphere, different flow and different bias voltage photocurrent responsecurve.The dynamic mechanism of photocurrent response curve is analyzed under thecondition of dry air and the formaldehyde atmosphere.We try to explore the synergymechanism of tin oxide quantum dots with zinc oxide.