✍ Scribed by Hidetoshi Taura; Hirofumi Daiguji
No coin nor oath required. For personal study only.
This study aimed to investigate the effect of pyridine in electrolyte on the photocurrent density-photovoltage (J-V) characteristics in dye-sensitized solar cells. When the concentration of pyridine (c p ) in an electrolyte (0.1 M LiI and 0.05 M I 2 in acetonitrile) is increased from 0 to 0.4 M, the opencircuit voltage (V oc ) increased by 0.14 V, whereas the short-circuit photocurrent density (J sc ) decreased by 3.0 mA cm -2 . The optimum c p for the maximum cell performance was around 0.1-0.2 M. The model calculation predicted that by increasing c p from 0 to 0.4 M, the electron diffusion coefficient (D) decreases by more than one order of magnitude and the lifetime of conduction band-free electrons ( ) increases by more than one order of magnitude, implying that the electron diffusion length (L = √ D ) increases by 31%, whereas the electron injection flux from dye molecules to TiO 2 nanoporous films (˚) decreases by 28%.
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The performance of a Ru(II) dye-sensitized nanocrystalline TiO 2 solar cell (DSSC) with both Triton X-100 and water as additives in 3-methoxypropionitrile solutions is described. In the presence of these additives, the open-circuit voltage (V oc ), fill factor and stability of the cell increased, wh
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