电极表面改性对染料敏化太阳电池性能影响的机理研究

The investigation on the mechanism of enhanced performance of dye-sensitized solar cells after anode modified

采用强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)技术,从染料敏化太阳电池(DSC)电子传输和复合角度对比了不同光强下导电玻璃表面阻挡层及TiO2薄膜优化使电池性能改善的内在原因.阻挡层的引入和TiO2薄膜的优化均通过电沉积法实现.结果表明,对多孔薄膜电极的不同改性均提高了电池的短路电流Jsc和效率η,但对电子传输和复合过程的作用机理有所不同:前者延长了电子寿命τn,但电子传输时间τd变化不明显;而后者则主要是延长τn的同时也缩短了τd.

IMPS（intensity-modulated photocurrent spectroscopy） and IMVS（ intensity – modulated photovoltage spectroscopy） measurements are utilized to analyse different mechanisms for enhancing the performance of dye-sensitized solar cells （DSC） based on modified anode. Electron transport and back reaction in DSC are investigated under different illumination intensities. The modifications of anode,blocking layer and modified TiO2 films,are performed by electrodeposition. It is found that short-current density Jsc and efficiency η of DSC are improved,but different mechanisms are obtained： the optimization of TCO by coating a blocking layer can effectively extend electron lifetime τn,but it has little influence on electron transport. On the other hand,the optimization of TiO2 film can enhance electron transport,finally shorten transit time τd and extend τn.