Study Of Zno Nanotetrapods Based Solar Cell

Nowdays, The rapid development of science and technology, it also brought a lot of unfavorable factors, Nonrenewable resources (fossil fuel) will be depleted gradually, ecological environment was destroyed. So it is imperative to solve the problem of energy shortage by developing and utilizing clean and renewable energy. Solar energy, as one of the most abundant natural resource, is the preferred energy to solve the energy crisis. Dye sensitized solar cell (DSSCs) and inorganic/organic polymer heteroj unction solar cells are new type of solar cell. Because they have the advantages of simple preparation method, low cost and so on. More and more people pay close attention to them, It is of great significance to develope vigorously the research of dye-sensitized solar cell and inorganic/organic polymer solar cell for solving the energy crisis and environmental issues.In this thesis, ZnO nano-tetrapods which have three-dimensional structure with special performance were prepared by using chemical vapor transport deposition. A dye-sensitised cells based on ZnO nano-tetrapods, N719dyes as sensitizers and homemade Pt as anticathode were assembled, characterized and studied the performance. Inorganic/organic polymer heterojunction solar cell based on ZnO nano-tetrapods with the uniform and smallest size of arms and conjugate polymer poly(1-methoxy-4-(2-ethylhexyloxy)-p-pheny-lenevinylene)(MEH-PPV) were also assembled, characterized and studied the performance.The follows are the main research work and conclusions:First, ZnO nano-tetrapods were controllable prepared using chemical vapor transport method by changing the process parameters. Structure and morphology of ZnO nano-tetrapods were characterized with X ray powder diffraction (XRD) and scanning electron microscopy(SEM)and other instruments. Optimal process parameters of preparation of ZnO nano-tetrapods were obtained. The results indicated that zinc vapor pressure, temperature, oxygen concentration, regional temperature of collection, regional temperature of oxygen leading and nitrogen flowing rate play important roles in ZnO nano-tetrapods formation and size, morphology. Mechanism of ZnO nano-tetrapods nucleation and growth were also studied.Second, DSSCs based on ZnO nano-tetrapods of smaller size, regular shape, uniform distribution exhibited a higher efficiency than DSSCs based on ZnO nano-tetrapods of larger size and irregular, uneven distribution. DSSCs based on ZnO nano-tetrapods with minimum size have short circuit current up to9.5mA·cm-2, open circuit voltage up to0.65V, fill factor up to0.52, photoelectric conversion efficiency up to3.21%.Third, Traditional inorganic/organic solar cell with device structure of FTO/PEDOT:PSS/ZnO nano-tetrapod:MEH-PPV/Al were assembled. When the active layer was composited with ZnO nano-tetrapods crystal and MEH-PPV with the ratio of7:3, device have the best photoelectric performance with short circuit current up to60.35μA·cm-2, open circuit voltage up to0.37V, fill factor up to0.29,conversion efficiency up to0.00645%. Photoelectric performance of inversion type cells with structure of ITO/ZnO nano-tetrapods:MEH-PPV/EDOT:PSS/Au was superior to the solar cell device of the traditional structure. For inversion type device, the influence of the heating treatment temperature on device performances was investigated. The results showed that photocurrent density achieved52.19μA·cm-2, open circuit voltage up to0.58V, fill factor up to0.24, photoelectric conversion efficiency reached0.00737%with the heat treatment temperature of130℃. In addition, the results showed that photocurrent density and photoelectric conversion efficiency device are optimal with heat treatment temperature of130℃and heat treatment time of15min.