Abstract
N-cetylpyridinium iodide ( N -CPI) as a new electric additive for enhancing photovoltaic performance of the dye-sensitized solar cell (DSSC) was studied. It showed high efficiency for enhancing both the open-circuit voltage and the short-circuit current density of DSSC when the suitable amount of N -CPI as 0.02 M was added in liquid electrolyte. The energy conversion efficiency of DSSC increased from 4.429% to 6.535%, with 47.55% enhancement. Therefore, it is a highly efficient electric additive for DSSC. The intrinsic reason is owing to the special molecular structure of N -CPI, which contains two different polarity groups. As a surfactant, N -CPI could form ordered arrangement in liquid electrolyte, which affects the diffusing ability and the redox reaction of I-/I3-, and further affects the photovoltaic performance of DSSC.
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