Titanium tetrachloride (TiCl4) treatment was employed to TiO2 coating deposited on fluoride-doped tin oxide (FTO) conducting glass and indium oxide doped tin oxide (ITO) conducting glass, respectively. The nano-crysta...Titanium tetrachloride (TiCl4) treatment was employed to TiO2 coating deposited on fluoride-doped tin oxide (FTO) conducting glass and indium oxide doped tin oxide (ITO) conducting glass, respectively. The nano-crystalline TiO2 coating was deposited using a composite powder composed of polyethylene glycol (PEG) and 25 nm TiO2 particles by vacuum cold spraying (VCS) process. A commercial N-719 dye was used to adsorb on the surface of TiO2 coating to prepare TiO2 electrode, which was applied to assemble dye-sensitized solar cell (DSC). The cell performance was measured under simulated solar light at an intensity of 100 mW·cm-2. Results show that with an FTO substrate the DSC composed of a VCS TiO2 electrode untreated by TiCl4 gives a short-circuit current density of 13.1 mA·cm-2 and an open circuit voltage of 0.60 V corresponding to an overall conversion efficiency of 4.4%. It is found that after TiCl4 treatment to the VCS TiO2 electrode with an FTO substrate, the short circuit current density of the cell increases by 31%, the open-circuit voltage increases by 60 mV and a higher conversion yield of 6.5% was obtained. However, when an ITO substrate is used to deposit TiO2 coating by VCS, after TiCl4 treatment, the conversion efficiency of the assembled cell reduces slightly due to corrosion of the conducting layer on the ITO glass by TiCl4.展开更多
Dye-sensitized solar cells(DSCs)are promising photochemical solar cells owing to their high efficiency and low cost.In this study,the influence of cell geometry,electrolyte composition,and counter electrode(CE)charact...Dye-sensitized solar cells(DSCs)are promising photochemical solar cells owing to their high efficiency and low cost.In this study,the influence of cell geometry,electrolyte composition,and counter electrode(CE)characteristics on the performance of DSCs was investigated to aim at improving the cell efficiency.Using an U-type cell geometry proposed decreased the internal resistance of DSCs and therefore increased the fill factor and energy conversion efficiency.The addition of DMPII to the I-/I3-based electrolyte increased the open-circuit voltage by decreasing the dark current.Compared to the DSCs with the Pt CE prepared by the thermal decomposition of H2PtCl6,the DSCs with the sputtered Pt CE showed a higher fill factor and short-circuit current density,owing to the high electrical conductivity and enhanced light-reflecting ability of the mirror-like sputtered Pt CE.Based on these results,the energy conversion efficiency of the DSC with the TiO2 porous films fabricated by a room temperature cold spray method was increased from 3.93%to 5.11%.The relatively high efficiency shows that the room temperature cold spray is a prospective method in fabricating nanocrystalline TiO2 films for flexible DSCs.展开更多
文摘Titanium tetrachloride (TiCl4) treatment was employed to TiO2 coating deposited on fluoride-doped tin oxide (FTO) conducting glass and indium oxide doped tin oxide (ITO) conducting glass, respectively. The nano-crystalline TiO2 coating was deposited using a composite powder composed of polyethylene glycol (PEG) and 25 nm TiO2 particles by vacuum cold spraying (VCS) process. A commercial N-719 dye was used to adsorb on the surface of TiO2 coating to prepare TiO2 electrode, which was applied to assemble dye-sensitized solar cell (DSC). The cell performance was measured under simulated solar light at an intensity of 100 mW·cm-2. Results show that with an FTO substrate the DSC composed of a VCS TiO2 electrode untreated by TiCl4 gives a short-circuit current density of 13.1 mA·cm-2 and an open circuit voltage of 0.60 V corresponding to an overall conversion efficiency of 4.4%. It is found that after TiCl4 treatment to the VCS TiO2 electrode with an FTO substrate, the short circuit current density of the cell increases by 31%, the open-circuit voltage increases by 60 mV and a higher conversion yield of 6.5% was obtained. However, when an ITO substrate is used to deposit TiO2 coating by VCS, after TiCl4 treatment, the conversion efficiency of the assembled cell reduces slightly due to corrosion of the conducting layer on the ITO glass by TiCl4.
文摘Dye-sensitized solar cells(DSCs)are promising photochemical solar cells owing to their high efficiency and low cost.In this study,the influence of cell geometry,electrolyte composition,and counter electrode(CE)characteristics on the performance of DSCs was investigated to aim at improving the cell efficiency.Using an U-type cell geometry proposed decreased the internal resistance of DSCs and therefore increased the fill factor and energy conversion efficiency.The addition of DMPII to the I-/I3-based electrolyte increased the open-circuit voltage by decreasing the dark current.Compared to the DSCs with the Pt CE prepared by the thermal decomposition of H2PtCl6,the DSCs with the sputtered Pt CE showed a higher fill factor and short-circuit current density,owing to the high electrical conductivity and enhanced light-reflecting ability of the mirror-like sputtered Pt CE.Based on these results,the energy conversion efficiency of the DSC with the TiO2 porous films fabricated by a room temperature cold spray method was increased from 3.93%to 5.11%.The relatively high efficiency shows that the room temperature cold spray is a prospective method in fabricating nanocrystalline TiO2 films for flexible DSCs.
