18 documents found, page 1 of 2
Bifacial dye-sensitized solar cells: a strategy to enhance overall efficiency b...
Wu, Jihui; Li, Yan; Tang, Qunwei; Yue, Gentian; Lin, Jianming; Huang, Miaoliang; Meng LijianDye-sensitized solar cell (DSSC) is a promising solution to global energy and environmental problems because of its clean, low-cost, high efficiency, good durability, and easy fabrication. However, enhancing the efficiency of the DSSC still is an important issue. Here we devise a bifacial DSSC based on a transparent polyaniline (PANI) counter electrode (CE). Owing to the sunlight irradiation simultaneously from...
Study of vanadium doped ZnO films prepared by dc reactive magnetron sputtering ...
Meng Lijian; Teixeira, Vasco M. P.; Santos, M. P. dosZnO films doped with vanadium (ZnO:V) have been prepared by dc reactive magnetron sputtering technique at different substrate temperatures (RT–500 C). The effects of the substrate temperature on ZnO:V films properties have been studied. XRD measurements show that only ZnO polycrystalline structure has been obtained, no V2O5 or VO2 crystal phase can be observed. It has been found that the film prepared at low su...
Structural modification of TiO2 nanorod films with an influence on the photovol...
Meng Lijian; Li, Can; Santos, M. P. dosTiO2 nanorod films have been deposited on ITO substrates by dc reactive magnetron sputtering technique. The structures of these nanorod films were modified by the variation of the oxygen pressure during the sputtering process. Although all these TiO2 nanorod films deposited at different oxygen pressures show an anatase structure, the orientation of the nanorod films varies with the oxygen pressure. Only a very ...
Effect of annealing temperature on TiO2 nanorod films prepared by dc reactive m...
Meng Lijian; Santos, M. P. dos; Li CanThe anatase TiO2 nanorod films have been prepared on ITO coated glass substrates at room temperature by dc reactive magnetron sputtering technique. The nanorods are highly ordered and are perpendicular to the substrate. XRD measurements show that the anatase nanorods have a preferred orientation along the [110] direction. The prepared nanorods were annealed at different temperatures (200 ºC – 500 ºC) in air for...
Growth and characterization of Bi2Se3 thin films by pulsed laser deposition usi...
Meng Lijian; Meng Hui; Gong Wenjie; Liu Wei; Zhang ZhidongBi2Se3 thin films were deposited on the (100) oriented Si substrates by pulsed laser deposition technique at different substrate temperatures (room temperature – 400 ºC). The effects of the substrate temperature on the structural and electrical properties of the Bi2Se3 films were studied. The film prepared at room temperature showed a very poor polycrystalline structure with the mainly orthorhombic phase. The c...
Sputtered highly ordered TiO2 nanorod arrays and their applications as the elec...
Meng Lijian; Ma Aifeng; Ying Piliang; Feng Zhaochi; Li CanFor the first time, the TiO2 nanorod arrays have been prepared on ITO substrates at room temperature by dc reactive magnetron sputtering technique. These TiO2 nanorods have a preferred orientation along the (220) direction and are perpendicular to the ITO substrate. Both the X-ray diffraction and Raman scattering measurements show that the highly ordered TiO2 nanorod arrays have an anatase crystal structure. Th...
Blocking layer effect on dye-sensitized solar cells assembled with TiO2 nanorod...
Meng Lijian; Li CanThree different thickness dense TiO2 (150 nm, 300 nm and 450 nm respectively) films were deposited on ITO substrates by dc reactive magnetron sputtering technique. These dense TiO2 films were used as the blocking layers. After that, TiO2 nanorod films were deposited on these dense TiO2 films by same technique. Both the dense and nanorod TiO2 films have an anatase phase. The dense TiO2 films have an orientation ...
Effect of the deposition rate on ITO thin films properties prepared by ion beam...
Meng Lijian; Teixeira, Vasco M. P.; Santos, M. P. dosIndium tin oxide (ITO) thin films have been deposited onto glass substrates at room temperature by ion beam assisted deposition technique at different deposition rates (0.1 -- 0.3 nm/s). The effects of the deposition rate on the structural, optical and electrical properties of the deposited films have been studied. The optical constants of the deposited films were calculated by fitting the transmittance spectra...
The control of the diameter of the nanorods prepared by dc reactive magnetron s...
Meng Lijian; Ren Tong; Li CanThe TiO2 nanorod arrays, with about 1.8 μm lengths, have been deposited on ITO substrates by dc reactive magnetron sputtering at different target-substrate distances. The average diameter of these nanorods can be modified from about 45 nm to 85 nm by adjusting the target-substrate distance from 90 mm to 50 mm. These nanorods are highly ordered and perpendicular to the substrate. Both XRD and Raman measurements ...
Structure and optical properties of ZnO:V thin films with different doping conc...
Wang Li-Wei; Meng Lijian; Teixeira, Vasco M. P.; Song Shigeng; Xu Zheng; Xu Xu-RongA series of ZnO thin films doped with various vanadium concentrations were prepared on glass substrates by direct current reactive magnetron sputtering. The results of the X-ray diffraction (XRD) show that the films with doping concentration less than 10 at.% have a wurtzite structure and grow mainly along the c-axis orientation. The residual stress, estimated by fitting the XRD diffraction peaks, increases wit...