高分子量PEO基凝胶电解质在DSSC中导电性能的研究

STUDY ON CONDUCTIVITY OF PEO-BASED GEL ELECTROLYTE IN DYE-SENSITIZED SOLAR CELLS

选用4种高分子量的PEO(M^-η=5×10~5、1×10~6、1.5×10~6、2×10~6)作为基质材料配制成凝胶电解质,并用于染料敏化太阳电池中。采用原子力显微镜(AFM)表征了PEO基凝胶电解质的表面形态结构。用DDS-11A型电导率仪测试了电解质的电导率,并且探讨了PEO的含量以及PEO的分子量与电解质电导率的关系。实验结果表明,随着PEO的含量与分子量的增加,凝胶电解质的电导率值呈非线性关系下降,PEO的分子量与电解质的电导率的关系满足类似Mark-Houwink方程。在光强1000W/m^2条件下,采用线性扫描伏安法测试了组装电池的伏安特性曲线,电池的1-V曲线结果表明,分子量为5×10~5、1×10~6、1.5×10~6、2×10~6的PEO基凝胶电解质对应的电池的光电转化效率分别为4.12%、4.07%、4.17%和3.16%。

Four kinds of PEO polymers with high molecular weight （Mη=5×10^5、1×10^6、1.5×10^6、2×10^6） were pre- pared as matrix to fabricate gel electrolyte and used in dye-sensitized solar cells. The surface morphology of gel electrolyte based on PEO was characterized by atomic force microscope （AFM）. The conductivity of gel electrolyte was tested and the relation of PEO content against conductivity and molecular weight of PEO against conductivity were studied by con- ductivity meter, respectively. The results indicated that the conductivity values decreased in nonlinearity tendency as the PEO content and molecular weight increased, and the relationship between molecular weight of PEO and electrolyte＇ conductivity followed the analogous Mark-Houwink equation. The photovohaic property of cells were tested through Linear Sweep Voltammetry method, and the results of I- V curves showed that PEO with different molecular weights Mη=5×10^5、1×10^6、1.5×10^6、2×10^6 corresponded to different photoelectric conversion efficiencies 4.12%, 4.07%, 4.17% and 3.16%, respectively.