【摘要】 采用强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)研究了染料敏化太阳电池(DSC)内部电子传输和背反应动力学特性.在纳米TiO2薄膜厚度相同的情况下,借助于IMPS/IMVS测量了由3种不同TiO2颗粒尺寸大小薄膜制备出DSC的电荷传输特征参数值.IMPS/IMVS理论模型拟合实验测量数据的结果表明:在不同入射光强下,随着颗粒尺寸的增大,电子扩散系数(Dn)增大,而电子寿命(τn)减小,电子传输时间(τd)也减小.Dn随颗粒尺寸增大而增加归因于薄膜表面积的减小,而τn减小可以通过缺陷之间的跃迁频率来解释,τd减小是由于TiO2薄膜内缺陷浓度减小而导致的.更多还原

【Abstract】 The mechanisms of electron transport and back-reaction kinetics in dye-sensitized solar cell （DSC） were investigated by intensity-modulated photocurrent spectroscopy （IMPS） and intensity-modulated photovoltage spectroscopy （IMVS）. The DSCS with three different sizes of TiO₂ particles were measured by IMPS/IMVS. The results indicate that the effective diffusion coefficient （D_n） increases along with the increase of particle size, while the electron lifetime （τ_n） and the electron transit time （τ_d） decrease with the increase of particle size under different induced-light intensities. The increase of D_n is attributive to the decrease of the film surface area. The decrease of τ_n is interpreted according to the frequency of electron trapping and de-trapping in defects. The decrease of trap concentration in TiO₂ films leads to the decrease of τ_d.更多还原