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TiO2 nanotube arrays for quantum dots sensitized solar cells

Vertically oriented, highly ordered TiO2 nanotube arrays have attracted considerable attention because of their impressive competence in a variety of applications including solar cells, chemical sensing, photocatalysis and biomedical industry. However, only a few papers reported on the solar cells prepared by combining TiO2 nanotubes and semiconductor quantum dots (QDs) based on composite structures. This paper presents the preparation of TiO2 nanotube arrays for the solar cells based on TiO2 nanotubes and CdSe QDs. The fabrication routes of highly organized TiO2 nanotube arrays synthesized by anodization of Ti foil in electrolyte were described, the performance of TiO2 nanotube arrays on the CdSe QDs sensitized TiO2 nanotube arrays photoelectrodes was investigated, too. The work herein details the effect of fabrication variables anodization time and examines the crystalline nature of the annealed (initially amorphous) samples. The nanotubes have an average inner diameter of 50 nm and a tube thickness of 12 nm. The maximum length of the TiO2 Nanotube we achieved is 9.75 μm. In QDs-sensitized TiO2 nanotube solar cells, CdSe QDs were used as the antenna layer (an absorber material) coating on the surface of titanium foil. Application of nanotube arrays to quantum dot solar cells under sunlight is discussed and compare to the dye sensitized solar cell. The quantum dots (QDs) sensitized solar cell's efficiencies can not match dye sensitized solar cell, but it will be a novel way to utilize solar energy in the future.