Study of commercial TiO2 nanoparticle size effect on the performnce of dye sensitzed solar cells by SLIM-PCV measurement

초록

The technique of stepped light-induced transient measurements of photocurrent and voltage (SLIM-PCV)was used for the measurement of electron diffusion coefficient (De) and electron lifetime (τ) for the dye-sensitized solar cells (DSSC) fabricated from several TiO2 nanoparticles indifferent sizes. Stepped light-induced transient measurements method, the power of a CW (continuous wave) laser irradiating to the DSSCs was decreased abruptly by ~3% with a function generator, and tempoaral variations of the transient photocurrents and photovoltages measured, from which the De and τ values were extracted. Because this study used commertial TiO2 phastes, solar cell were show same stability. Determined De and τ were measured by SLIM-PCV to investigate the particle size effect. It has been found that the Deincreases and τ increases with the increase of particle size. This increase was related to the decrease of grain boundaries that was efficient transport of electrons. This study suggests that the optimized TiO2particle size is required for the efficient transport of electrons in DSSC.