Fabrication of Novel High Potential Chromium-Doped TiO2 Nanoparticulate Electrode-based Dye-Sensitized Solar Cell (DSSC)

در اين مقاله نانوذرات TiO2و تيتيانيوم دي اكسيد دوپ شده با كروم با روش سل-ژل سنتز شده و به عنوان الكترود در سلول خورشيدي حساس به رنگ به كار گرفته شده اند. نتايج نشان داد كه نمونه هاي سنتز شده شامل فاز آناتاز با اندازه متوسط 15-10 نانومتر مي باشد. تيتانيوم دي اكسيد دوپ شده با كروم جذب ناحيه مريي بهتري از خود نشان داد كه به دليل پديده پلاسمون مي باشد. براي سلول خورشيدي حساس به رنگ ساخته شده با تيتانيوم دي اكسيد دوپ شده با كروم جريان بالاتري نيز مشاهده شد كه ثابت مي شود مي توان از اين نلنوساختار براي بالا بردن بازده در اين سلول خورشيدي بهره برد.

In the current study, pure TiO2 and Cr-doped TiO2 (Cr@TiO2) nanoparticles were synthesized via sol-gel method and the resulting materials were applied to prepare the porous TiO2 electrodes for dye-sensitized solar cells (DSSCs). It is hypothesized that the advantages of the doping of the metal ions into TiO2 lattice are the temporary rapping of the photogenerated electron-hole (charge carriers) by the metal dopants and the retarding charge recombination during electron migration from TiO2 to the electrode surface. Spectroscopic and microscopic findings showed that all the prepared samples consist of only anatse phase with average size of 10-15nm. In addition, relative to the bare TiO2, Cr@TiO2 absorption in visible light region was considerably improved due to the surface Plasmon phenomenon. Current-voltage (I-V) curves exhibited that the solar cells made of Cr@TiO2 nanoparticles results in higher photocurrent density than the cells made of bare TiO2. The large improvement of photovoltaic performance of the Cr-doped TiO2 cell stems from negative shift of TiO2 conduction band and retarding charge recombination. Finally, it is concluded that the proposed route in the current study is an effective way to enhance the energy conversion efficiency and overall performance of DSSC.