期刊
NANOTECHNOLOGY
卷 22, 期 28, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/28/285201
关键词
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资金
- National Science Foundation/EPSCoR [0554609, 0903804]
- SD EPSCoR
- EPSCoR
- Office Of The Director [0903804] Funding Source: National Science Foundation
Crack-free TiO2 nanotube (NT) membranes were obtained by short time re-anodization of a sintered TiO2 NT array on Ti foil, followed by dilute HF etching at room temperature. The resulting freestanding TiO2 membranes were opaque with a slight yellow color having one end open and another end closed. The membranes were then fixed on transparent fluorine-tin-oxide glass using a thin layer of screen-printed TiO2 nanoparticles (NPs) as a binding medium. It was found that low temperature treatment of the resulting NT/NP film under appropriate pressure before sintering at 450 degrees C was critical for successful fixation of the NT membrane on the NP layer. The resulting films with open-ends of NT membranes facing the NP layer (open-ends down, OED, configuration) exhibited better interfacial contact between NTs and NPs than those with closed-ends facing the NP layer (closed-ends down, CED, configuration). The cells with an OED configuration exhibit higher external quantum efficiency, greater charge transfer resistance from FTO/TiO2 to electrolyte, and better dye loading compared to CED configurations. The solar cells with the OED configuration gave 6.1% energy conversion efficiency under AM1.5G condition when the commercial N719 was used as a dye and I-/I-3(-) as a redox couple, showing the promise of this method for high efficiency solar cells.
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