柔性染料敏化太阳电池光阳极的优化及叠层电池的初步研究

Optimization of Photoelectrode for Flexible Dye-sensitized Solar Cell and Preliminary Study of Tandem Cell

在前期对冷等静压制备柔性染料敏化太阳电池(DSC)研究的基础上,开展了浆料的优化及叠层DSC的研究。首先利用水热法处理由小颗粒P25调配的浆料,发现处理后浆料的稳定性及DSC的效率得到了大幅提高。在P25浆料中加入不同比例200 nm TiO2大颗粒提高光散射,当P25与200 nm TiO2比例为4:1时,DSC获得最高光电转换效率3.11%。在此基础上,尝试用N719和N749双层染料敏化,发现双层染料敏化后电池的效率介于N719和N749单独敏化的电池效率,这可能是由于光阳极变厚不利于电子传输以及染料相互接触影响染料纯度,光阳极厚度及电池结构有待于进一步优化。

Based on the preparation of flexible dye-sensitized solar cells （DSC） by cold isostatic pressing method, optimization of the paste and tandem DSC were investigated. The results presented that hydrothermal treatment of P25 paste could improve the stability of the paste and the efficiency of DSC obviously. Proper amount of 200 nm TiO2 particles was added to the P25 paste to enhance light scattering of photoelectrode. The highest conversion effi- ciency of 3.11% was obtained at the 4：1 ratio of P25 to 200 nm TiO〉 Subsequently, N719 and N749 double-layer tandem DSC were studied. The results show that the efficiency of the double-layer tandem DSC is higher than that of N749 totally sensitized DSC but lower than that of N719 totally sensitized DSC. This may be caused by that thicker photoelectrode hampers the electronic transmission and dyes contact impacts the purity of dyes. The thickness of photoelectrode and cell structure need to be optimized.