Interface functionalization of photoelectrodes by electrophoretic deposition of graphene quantum dots for high performance dye-sensitized solar cells
| Autor: | Ying-Chun Huang, 黃盈竣 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In the dye-sensitized solar cells (DSSCs), the performance of DSSCs is extremely related to photoelectrodes. Interface of fluorinated-tin oxide (FTO)/TiO2, TiO2/TiO2, and TiO2/electrolyte in the DSSCs directly influence the power conversion efficiency (PCE). In this study, graphene quantum dots (GQDs) synthesized by pyrolyzing citric acid are introduced to modify the interface between FTO and TiO2 so as to suppress charge recombination. The surface morphology of GQDs-decorated FTO is demonstrate by SEM and AFM. In addition, electrochemical impedance spectra (EIS), itensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) are applied to survey the charge recombination. The final PCE of DCCS is enhanced from 8.34% to 9.35%, accompanied by the increase of short-circuit photocurrent density, and overall improvement in PCE is 12.1%. The suppression of charge recombination and increase of charge transfer rate are both evidences of an improvement in PCE. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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