Review of TiO_2 Nanowires in Dye Sensitized Solar Cell

摘要

Dye sensitized solar cell is an alternative option for silicon solar cell, because of their flexibility, transparency and low cost. The need for DSSC to absorb far more of the incident light was the driving force for the development of mesoscopic semiconductor materials with an enormous internal surface area. The major breakthrough in DSSC was the use of a high surface area nanoporous TiO_2 layer. In order to obtain a high conversion yield in solar cells, it is necessary to collect ion carriers produced by photons as electrical current before their re-combination. The collection of ion carriers must be carried out significantly faster than the re-combination. This review deals with 1D TiO_2 nanowires with TiO_2 nanoparticles with different pho-toanode modification technique core shell, bilayer and doping which can suppress the recombination rate and electron loss. The introduction of such a structure can build an energy barrier at the semiconductor/electrolyte interface to retard the electron transfer to the electrolyte and reduce the density of surface traps, which are considered to be the recombination centers.