染料敏化太阳电池的光生电流对短路电流的影响

等效电路分析和实验结果证实,染料敏化太阳电池的光生电流显著地影响着电池电压-电流曲线中的短路电流.首先根据等效电路分析,得出了染料敏化太阳电池的光生电池值,以及理论上光生电流对短路电流的影响.进一步的电池制备和效率测试,证明了上述的理论计算论断.最后,根据光生电流与短路电流的关系,本文提出了通过提高光生电流来提高短路电流,最终提高染料敏化太阳电池效率的思路,并按照上述思路得到了电池效率提升20%的试验结果.

Influences of Photo Current Iph on Short-circuit Current Isc of Dye-sensitized Solar Cell

It is found from the equivalent circuit analysis and the experiment results that, the change of photo current (Iph) significant-ly influences the short-circuit current (Isc) of the I-V curve. Firstly, the Iph value of the dye sensitized solar cells (DSSCs) is derived,and the influence to Isc is analyzed theoretically by the equivalent circuit mode. Further experiment on the laboratory-made dye sensi-tized solar cell confirms well with the theoretical results. In the end, the possible way to improve the efficiency of the DSSCs based on the relation of Iphwith Isc is suggested. The measured I-V eurves of cells, which have the enhanced Iph, showed significantly increased values of Isc, while no obvious change was observed in FF, Voc and the shape of I-V curve. From the measured I-V curves of cells, the analysis about Iph to the I-V curve was confirmed. The detail values of Iph,Iscand η showed the efficiencies of cells were enhanced 20% by the increment of Iph