Abstract
Different from other procedures, we introduce a simple procedure for preparing large-area, free-standing, non-curling, opened-end TiO2 nanotube array (TiNT) films by selected annealing temperature and oxalic acid treatment. The selective dissolution properties of oxalic acid are used to easily separate TiNT off Ti substrates and dissolve the bottom caps in this one-pot reaction. These TiNT films were attached on fluorine-doped tin oxide (FTO) glasses and used in the front-side-illuminated dye-sensitized solar cell (DSSC). As compared to the DSSC made of closed-end TiNT, the DSSC made of opened-end TiNT exhibited an enhancement in efficiency from 4.65 to 7.82 %, corresponding to 70 % improvement.
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