ZnO/TiO_2皮芯厚度比对染料敏化太阳电池性能的影响

Effect of ZnO /TiO_2 core-sheath thickness ratios on performance of dye sensitized solar cells

为探究ZnO/TiO2皮芯厚度比对染料敏化太阳电池(DSSC)光电性能的影响,采用同轴静电纺丝,通过控制皮芯溶液纺丝流率比获得了一系列不同皮芯厚度比例的ZnO/TiO2纳米纤维,利用场发射扫描电镜(FE-SEM)、透射电镜(TEM)、傅里叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)对其进行表征。结果显示,获得的纳米纤维是以钎锌矿ZnO为皮层和锐钛矿TiO2为芯层组成的。以ZnO/TiO2皮芯纳米纤维膜为光阳极膜组装了DSSC。结果发现,当皮芯纺丝流率比为1∶1时,皮芯纳米纤维直径约为154 nm,芯层约为90 nm,其染料吸附量最大,DSSC的光电转化效率最高,达到了5.47%,比纯TiO2纳米纤维组装的DSSC高约22%。

To explore the effect of different core-sheath thickness ratios on the photoelectric performance of a dye sensitized solar cell （DSSC）,the coaxial electrospinning was used to control different spinning core-sheath solution flow rate ratios for different thickness ratios of core-sheath ZnO/TiO2 nanofibers.Field emission scanning electron microscopy （FE-SEM）,transmission electron microscopy （TEM）,Fourier infrared spectroscopy （FT-IR） and X-ray diffraction （XRD） were used to characterize the coresheath nanofibers.The results revealed that the nanofiber is composed of wurtzite ZnO as the sheath and anatase TiO2 as the core.Then,the ZnO/TiO2 core-sheath nanofibrous membranes were utilized as photoanode material to assemble the dye sensitized solar cell.At last,it was found that when the core-sheath spinning flow rate ratio is 1 ∶ 1,the diameter of core-sheath nanofibers is about 154 nm and the core layer is about 90 nm in diameter,and the dye adsorption amount is the largest and the DSSC based on the coresheath nanofibers has the highest efficiency up to 5.47％,which is 22％ higher than DSSC assembled from the TiO2 nanofibers.