Abstract:
Bismuth Oxyiodide (BiOI) has recently gained considerable attention as a non-toxic
sensitizing material in the solar energy conversion process. Usually, in dye-sensitized solar
cells, Ru-based dyes are used as sensitizers and they are high-cost materials. In the present
work, BiOI nanofilms were deposited on TiO2 nanoporous electrodes by the Successive Ionic
The layer Adsorption and Reaction (SILAR) method and the optical and electrical properties have
been studied. BiOI film shows better absorption in the visible region of the solar spectrum. In
order to find the suitable number of SILAR cycles for high-performance BiOI-sensitized solar
cells, FTO/TiO2/BiOI/electrolyte/Pt type solar cells have been fabricated and characterized.
Iodide/triiodide redox couple-based liquid has been used as electrolytes in solar cells. TiO2
electrode fabricated with 15 SILAR cycles of BiOI shows a maximum power conversion
the efficiency of 0.54% while N719 dye-sensitized solar cell shows an efficiency of 3.39% under
the simulated light of 100 mW cm-2 with AM 1.5 spectral filter. However, N719 dye is an
expensive commercial dye and BiOI is a new low-cost alternative sensitizer for dye-sensitized
solar cells.
