Abstract
In this study, we have investigated the surface analysis and optoelectronic properties on the synthesis of N-CNT/TiO2 composites thin films, using sol gel method for a dye synthetized solar cell (DSSC) which is found to be simple and economical route. The titanium dioxide based solar cells are an exciting photovoltaic candidate; they are promising for the realization of large area devices. That can be synthetized by room temperature solution processing, with high photoactive performance. In the present work, we stated comparable efficiencies by directing our investigation on obtaining Sol Gel thin films based on N-CNT/TiO2, by dispersing nitrogen (N) doped carbon nanotubes (N-CNTs) powders in titanium tetraisopropoxyde (TTIP). The samples were assessed in terms of optical properties, using UV—visible absorption spectroscopic techniques. After careful analysis of the results, we have concluded that the mentioned route is good and more efficient in terms of optoelectronic properties. The gap of “the neat” 0.00w% N-CNT/TiO2 is of 3eV, which is in a good agreement with similar gap of semiconductors. The incorporated “w%NCNTs” led to diminishing the Eg with increasing N-CNTs amount. These consequences are very encouraging for optoelectronic field.
Highlights
Carbon nanotubes are the subject of many investigations in various areas such as composite materials [1,2,3], in the (Li ion) batteries to increase their performance [4], the storage of the energy [5], optic [6] and photovoltaic [7]
0.00w% nitrogen doped carbon nanotubes (N-CNTs)/TiO2 is of 3eV, which is in a good agreement with similar gap of semiconductors [25]
Increasing the quantity of carriers leads to an augmentation in the visible absorption, increasing the figure of merit (FOM) of the present thin films based on NCNTs/TiO2
Summary
Carbon nanotubes are the subject of many investigations in various areas such as composite materials [1,2,3], in the (Li ion) batteries to increase their performance [4], the storage of the energy [5], optic [6] and photovoltaic [7]. We have shown that the TiO2 and N-CNT composed an active layer, and the electrons recombination procedure may affect the best conversion of DSSCs’ efficiency. Nitrogen doped carbon nanotubes (N-CNTs) are known by their large surface area, high electrical conductivity and chemical stability. These properties have provided to N-CNTs potential applications in NCNT-based composites which are used as candidates for nanoelectronic devices. The synergistic effect of N-CNTs and TiO2 is caused by the improved photocatalytic activity through reducing recombination efficiency of electron-hole pairs
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