Effect of Crystallization of Cu2ZnSnSxSe4-x Counter Electrode on the Performance for Efficient Dye-Sensitized Solar Cells
Effect of Crystallization of Cu2ZnSnSxSe4-x Counter Electrode on the Performance for Efficient Dye-Sensitized Solar Cells
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Cu2ZnSnSxSe4-x对电极结晶对高效染料敏化太阳能电池性能的影响
DOI：
10.1021/am503963b
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发表时间：
2014-12-20
影响因子：
9.5
通讯作者：
Wu, Sixin
中科院分区：
文献类型：
--
作者：
Chen, Hongli;Kou, Dongxing;Wu, Sixin
染料敏化太阳能电池（DSSC）中的Cu 2 ZnSnSxSe 4-x（CZTSSe）对电极（CE）通常具有多孔结构，但由于其丰富的晶界，其高表面积也会阻碍电子传输过程。在此，我们采用了一种方便的溶液法和快速加热过程，在DSSC中制备结晶良好的CZTSSe CE。深入讨论了CZTSSe薄膜晶化对DSSC性能的影响。对CZTSSe薄膜进行了热重分析、物相形貌、电导率和电化学性能测试。结果表明，快速加热有利于形成晶粒粗大、结晶良好的薄膜。随着晶化程度的提高，体膜中的孔隙率和晶界显著减少，电荷输运过程逐渐改善。利用循环伏安和电化学阻抗谱测量，我们认为由于DSSC的上级电催化活性，加速电荷传输对DSSC的光伏性能具有重要意义。由于获得了最高的电池效率，结晶良好的CZTSSe是一种有效的CE催化材料。
Cu2ZnSnSxSe4-x (CZTSSe) counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) are commonly developed with porous structures, but their high surface area could also retard electron transport processes owing to the abundant grain boundaries. Herein, we employed a convenient solution method and a rapid heating process to prepare well crystalline CZTSSe CEs in DSSCs. The influence of crystallization of CZTSSe film on DSSCs performances was discussed in depth. The thermogravimetric analysis, phase morphology, conductivity, and electrochemical characteristics of CZTSSe films were performed. It is found that the rapid heating process is beneficial to the formation of well crystalline film with large grains. As the porosity and grain boundaries in the bulk film are dramatically reduced with the enhanced crystallization, the charge transport process is gradually improved. Using cyclic voltammogram and electrochemical impedance spectroscopy measurements, we propose that the accelerating charge transport is of great importance to the photovoltaic performances of DSSCs due to their superior electrocatalytic activities. As the highest cell efficiency was achieved, well crystalline CZTSSe is an efficient CE catalytic material.