| Titanium dioxide (TiO2) is a wide bandgap semiconductor and arewidely applied in environmental, biological research, optical communication,and so forth. Compared with other nanomaterials of TiO2, nanotubes have somesuper properties such as high electron mobility, quantum confinement effects,and show attractive application, for example, photoelectric detector, solar cellsand so on. The structure of the nanotubes paly a very important role in theseproperties.In this article, we synthesized highly ordered and well controlled TiO2nanotubes via anodic oxidation process. High efficient UV photodetector basedon TiO2nanotubes were manufactured to study the connection between theirphotoelectric properties and structure-morphology. A new type CZTS quantumdot sensitized solar cells were manufactured. Some conclusions can be got fromour work:(1) A structure well-controlled and tailored TiO2nanotubes arrays weresynthesized through precise control in anodizing process, andtherefor over etching was avoided. (2) Anatase TiO2was obtained via change the technology of heattreatmen. A precise control in annealing process was applied, and atube-transformation to nanoparticle structure was got, which show a very highactivation and may been widely used in photoelectric device.(3) The front-illuminated ultraviolet photodetectors based on TiO2nanotube arrays were prepared, which exhibit excellent stability and wavelengthselectivity with the photocurrent, photo-to-dark current ratio and responsivity upto1395A,10730and176.3AW-1, respectively, suggesting their verypromising application as efficient photodetectors.(4) CZTS quantum dot were synthesized by“one pot” method. Quantumdot sensitized solar cells based on TiO2nanotubes successfully fabricated, whereCZTS used as light absorber and TiO2nanotubes as the electronic transmissionchannel. Through solar cell testing system, the device show a conversionefficiency0.021%. |
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