The crystalline structure and surface morphology of TiO2 semiconductor coating play an important role in the conversion efficiency of dye-sensitized solar cells. In order to obtain TiO2 coating with controllable morph...The crystalline structure and surface morphology of TiO2 semiconductor coating play an important role in the conversion efficiency of dye-sensitized solar cells. In order to obtain TiO2 coating with controllable morphology and high porosity, nanoporous TiO2 films were fabricated on conducting glass （FTO） substrates, Ti thin films （1.5-2 gin） were deposited on conducting glass （FTO） substrates via the DC sputtering method, and then electrochemically anodized in NH4F/ethylene glycol solution. The crystalline structure and surface morphology of the samples were characterized by X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM）, respectively. The influences of anodizing potential, electrolyte composition, and pH value on the surface morphology of nanoporous TiO2 films were extensively studied. The growth mechanism of nanoporous TiO2 films was discussed by current density variations with anodizing time. The results demonstrate that nanoporous TiO2 films with high porosity and three-dimensional （3D） networks are observed at 30 V, when the NH4F concentration in ethylene glycol solution is 0.3% （mass fraction） and the electrolyte pH value is 5.0.展开更多
DSSCs （dye sensitized solar cells） are expected to be one of the efficient third generation solar cells that are generating green energy at low production cost since no vacuum systems or expensive equipment are requ...DSSCs （dye sensitized solar cells） are expected to be one of the efficient third generation solar cells that are generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. In this paper, review of the structure, and operation principles of the dye sensitized solar cell DSSC is outlined. Extraction and optical characterization of Curcumin dye are detailed. Preparation procedures, optical and electrical characterization of the DSSC using Curcumin dye, as well as factors limiting the operation of the DSSC are discussed. Open circuit voltage Voc = 430 mV and short circuit current Ise = 0.72 mA from a 3 cm2 curcumin sensitized solar cell is achievable under solar illumination.展开更多
The synthesis of ZnO architecture on a fluorine-doped SnO(FTO) conducting glass pre-coated with nanoporous TiOfilm has been achieved by a one-step hydrothermal method at a temperature of 70℃.The effect of the reactio...The synthesis of ZnO architecture on a fluorine-doped SnO(FTO) conducting glass pre-coated with nanoporous TiOfilm has been achieved by a one-step hydrothermal method at a temperature of 70℃.The effect of the reaction time on the morphology of the ZnO architecture has been investigated,and a possible growth mechanism for the formation of the ZnO architecture is discussed in detail.The morphology and phase structures of the as-obtained composite films have been investigated by field-emission scanning electron microscopy(FE-SEM) and X-ray diffraction(XRD).The results show that the growth time greatly affects the morphology of the obtained ZnO architecture.The photoelectrochemical performances of as-prepared composite films are measured by assembling them into dye sensitized solar cells(DSSCs).The DSSC based on the as-prepared composite film (2 h) has obtained the best power conversion efficiency of 1.845%.展开更多
A novel complex nanostructured TiO2 electrode and fabrication process were proposed and demonstrated to improve the performance of dye-sensitized solar cells(DSSCs).In the proposed process,a nanoporous TiO2 layer was ...A novel complex nanostructured TiO2 electrode and fabrication process were proposed and demonstrated to improve the performance of dye-sensitized solar cells(DSSCs).In the proposed process,a nanoporous TiO2 layer was firstly fabricated on the FTO(fluorine-doped tin oxide) conducting substrate by an anodization process,then a nanoparticulate TiO2 film was deposited on the nanoporous TiO2 layer by the screen printed method to form the complex nanostructured TiO2 electrode.The experiments demonstrated that the nanoporous TiO layer can enhance the light scattering,decrease the contact resistance between TiO2 electrode and FTO,and suppress the recombination of I3-ion with the injected electrons of FTO.The process variables are crucial to obtain the optimized performance of DSSCs.By adopting the optimized process,improved conversion efficiency of DSSCs was achieved at AM 1.5 sunlight.展开更多
基金Projects(21171027,50872014) supported by the National Natural Science Foundation of ChinaProject(K1001020-11)supported by the Science and Technology Key Project of Changsha City,China
文摘The crystalline structure and surface morphology of TiO2 semiconductor coating play an important role in the conversion efficiency of dye-sensitized solar cells. In order to obtain TiO2 coating with controllable morphology and high porosity, nanoporous TiO2 films were fabricated on conducting glass （FTO） substrates, Ti thin films （1.5-2 gin） were deposited on conducting glass （FTO） substrates via the DC sputtering method, and then electrochemically anodized in NH4F/ethylene glycol solution. The crystalline structure and surface morphology of the samples were characterized by X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM）, respectively. The influences of anodizing potential, electrolyte composition, and pH value on the surface morphology of nanoporous TiO2 films were extensively studied. The growth mechanism of nanoporous TiO2 films was discussed by current density variations with anodizing time. The results demonstrate that nanoporous TiO2 films with high porosity and three-dimensional （3D） networks are observed at 30 V, when the NH4F concentration in ethylene glycol solution is 0.3% （mass fraction） and the electrolyte pH value is 5.0.
文摘DSSCs （dye sensitized solar cells） are expected to be one of the efficient third generation solar cells that are generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. In this paper, review of the structure, and operation principles of the dye sensitized solar cell DSSC is outlined. Extraction and optical characterization of Curcumin dye are detailed. Preparation procedures, optical and electrical characterization of the DSSC using Curcumin dye, as well as factors limiting the operation of the DSSC are discussed. Open circuit voltage Voc = 430 mV and short circuit current Ise = 0.72 mA from a 3 cm2 curcumin sensitized solar cell is achievable under solar illumination.
基金Project supported by the National Basic Research Program of China(No.2007CB936300)the Research Foundation for Advanced Talents of Jiangsu University,China(No.10JDG 142)
文摘The synthesis of ZnO architecture on a fluorine-doped SnO(FTO) conducting glass pre-coated with nanoporous TiOfilm has been achieved by a one-step hydrothermal method at a temperature of 70℃.The effect of the reaction time on the morphology of the ZnO architecture has been investigated,and a possible growth mechanism for the formation of the ZnO architecture is discussed in detail.The morphology and phase structures of the as-obtained composite films have been investigated by field-emission scanning electron microscopy(FE-SEM) and X-ray diffraction(XRD).The results show that the growth time greatly affects the morphology of the obtained ZnO architecture.The photoelectrochemical performances of as-prepared composite films are measured by assembling them into dye sensitized solar cells(DSSCs).The DSSC based on the as-prepared composite film (2 h) has obtained the best power conversion efficiency of 1.845%.
基金supported by the National Natural Science Foundation of China (Grant Nos. 60906040,60925015)the Shanghai Nano Project(Grant No. 11nm0500600)
文摘A novel complex nanostructured TiO2 electrode and fabrication process were proposed and demonstrated to improve the performance of dye-sensitized solar cells(DSSCs).In the proposed process,a nanoporous TiO2 layer was firstly fabricated on the FTO(fluorine-doped tin oxide) conducting substrate by an anodization process,then a nanoparticulate TiO2 film was deposited on the nanoporous TiO2 layer by the screen printed method to form the complex nanostructured TiO2 electrode.The experiments demonstrated that the nanoporous TiO layer can enhance the light scattering,decrease the contact resistance between TiO2 electrode and FTO,and suppress the recombination of I3-ion with the injected electrons of FTO.The process variables are crucial to obtain the optimized performance of DSSCs.By adopting the optimized process,improved conversion efficiency of DSSCs was achieved at AM 1.5 sunlight.
