Porous TiO2 nanoparticles coated on ZnO nanowire arrays(TiO2 NP/ZnO NW) as photoanode for dye-sensitized solar cell(DSSC) has been fabricated and investigated to improve the power conversion efficiency. The TiO2 NP/ZnO NW photoanode consists of single crystalline ZnO NWs synthesized via hydrothermal method and porous TiO2 NP film covered on the sur...
We report the use of a solution-processed ZnO nanoparticle buffer layer in hybrid solar cells based on blends of poly(3-hexylthiophene)(P3HT) and CdSe quantum dots. Depending on the size of the CdSe nanocrystal, these devices exhibit20-70% higher photocurrent output than similar devices without the ZnO nanoparticle layer, which is attributed to a c...
The valence-band offset of the wurtzite ZnO/rutile TiO(2) heterojunction was directly determined by x-ray photoelectron spectroscopy. The wurtzite ZnO (0001) layer was grown on commercial rutile (101) TiO(2) by metal-organic chemical-vapor deposition. The results show that the valence-band offset is 0.14 +/- 0.05 eV, which agrees well with previous...
We performed first-principle total-energy calculations to investigate the mechanism for the realization of high quality p-type ZnO codoped with lithium and nitrogen. We find that the higher hole concentrations measured in the codoped ZnO is related to decreased ionization energy of acceptors and reduction of compensations. The dual acceptor NOLiZn ...
The microstructure and electrical properties of ZnO-Bi2O3-based varistor ceramics prepared by direct high-energy ball milling of the dopants were studied. The varistor ceramics samples were characterized by XRD and SEM analysis, as well as by dc electrical measurements, such as the nonlinearity coefficients, leakage current and threshold voltage. T...
The calculation results of the surface plasmon(SP) energy and Purcell factor of ZnO/NiSi2 demonstrate the possibility of using NiSi2 to enhance the UV emission of ZnO by SP coupling. Experimentally, ZnO films were deposited on NiSi2 layers synthesized by ion implantation, and the roughness of the NiSi2 layers spans a large range from3 to38 nm, prov...
Y(NO3)3·6H2O-doped ZnO-Bi2O3-based varistor ceramics were prepared using a solid reaction route. The microstructure, electrical properties, degradation coefficient(DV), and dielectric characteristics of varistor ceramics were studied in this paper. With increasing amounts of Y(NO3)3·6H2O in the starting composition, Y-containing Bi-rich, Y2O3, and ...
A high concentration of shallow donor defect is formed in P-diffused ZnO single crystals. X-ray photoelectron spectroscopy analysis indicates that P atom occupy different lattice site at different diffusion temperature. Nature of the donor defect has been discussed.
