调制光/电作用下染料敏化太阳电池中电荷传输和界面转移研究

详细讨论了染料敏化太阳电池(DSC)在稳态光照射或外加偏压下电荷的传输和转移过程,以及在调制光/电作用下电池的频率响应特点.通过电化学阻抗谱、光电化学阻抗谱、强度调制光电流谱和强度调制光电压谱等四种频谱光电测试手段,对DSC中TiO₂薄膜电子传输和界面转移的相关时间常数进行测量.详细分析和比较了电荷的传输及转移过程对时间常数的影响.结果表明,在低光强或低偏压下电荷传输和转移过程对时间常数影响较小,但在高光强或高偏压下对电子寿命影响明显.

Processes of charge transport and transfer in dye-sensitized solar cell by electrical and optical modulation techniques

In the present work, the processes of charge transport and electron transfer in dye-sensitized solar cell (DSC) under the stable illumination or forward bias were discussed, and the frequency response characteristic to the small perturbation of the light or voltage in DSC was also interpreted. The electron transit time and electron lifetime were investigated by electrochemical impedance spectroscopy (EIS), photoelectrochemical impedance spectroscopy (PEIS), intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS). The time constants determined by different measurement techniques were compared. The results showed that the process of charge transport and electron transfer has no significant influence on the time constants under low bias or low light intensity, and this process affected predominately the electron lifetime under high bias or high light intensity.