Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 143, Issue 2, Pages 693-701Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2013.09.055
Keywords
Ceramics; Crystal growth; Electrochemical techniques; Photoluminescence spectroscopy; Powder diffraction
Categories
Funding
- National Science Council of Taiwan [NSC 99-2221-E-155-028]
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Low concentrations of Li in Li-doped ZnO nanofibers prepared using hydrothermal method at low temperature can introduce oxygen vacancies and intrinsic Zn ions into the structure. Photo-luminance (PL) was used to investigate oxygen vacancies in the structure of ZnO nanofibers prepared by lower annealing temperature, and the XPS technique was also employed to satisfy the PL analysis results. PL analysis showed that oxygen vacancies increase in conjunction with Li concentrations. A shift in the lower angle of XRD patterns also demonstrates the defect in ZnO structure related to Li doping. Higher-efficiency DSSCs were obtained from the lower Li concentration of 0.01 M in ZnO nanofibers. Higher concentrations of Li tended to produce large amounts of cross-like nanofibers, which increase the open circuit voltage of the DSSCs. The highest open circuit voltage (V-oc) obtained was 750 my, which was higher than the best reported ZnO nanofibers-based DSSCs. Intensity modulation photocurrent spectroscopy (IMPS) and intensity modulation photo-voltage spectroscopy (IMVS) analysis showed that low amounts of Li-doping improved the electron injection efficiency of ZnO nanofibers in DSSCs. Lower recombination rates with higher electron transfer efficiency for 0.01 M Li-doped DSSCs exhibited higher efficiency of 0.59% than non-doped ZnO nanofibers DSSCs. (C) 2013 Elsevier B.V. All rights reserved.
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