The performance of dye-sensitized solar cells using different carbon materials as counter electrodes
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摘要: 分别以石墨/活性炭/炭黑/碳纳米管为原料，采用丝网印刷技术制备染料敏化太阳能电池(DSSC)的对电极。分析比较了各原料的孔结构、比表面积及各原料制膜的方块电阻对组装电池性能的影响。结果表明，对于制备DSSC对电极的原料而言，孔尺寸要有一定的分布范围，孔形状要求口径大于或至少等于体径；比表面积并非越大越好，还应考虑其内部孔结构；制膜的方块电阻并非是影响电池性能的决定性因素。另外，原料的颗粒形状及排布方式也影响电池的性能。笔者以比表面积31.163m2 · g-1、方块电阻12.5 Ω/□的碳纳米管所制碳膜组装的电池性能最佳，光电转化效率达5.87%。Abstract: Counter electrode films for dye-sensitized solar cells (DSSCs) were prepared by screen printing using graphite, activated carbon, carbon black and carbon nanotubes (CNTs) as raw materials. The effects of pore structure, BET surface area and the sheet resistance of the as-prepared counter electrode films on the performance of DSSCs were investigated. Results show that the conductivity of the raw materials is not the crucial factor for the performance of the DSSCs. The performance of the DSSC is not directly improved by increasing the BET surface area of the raw materials. It is also related to the pore size distribution of carbon materials, the particle shape and their alignment. The DSSCs assembled using CNT film counter electrodes with a BET surface area of 31.163 m2 · g-1 show the largest photoelectric conversion efficiency of 5.87%.
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Key words:
- Dye-sensitized solar cells /
- Carbon materials /
- Screen printing /
- Counter electrode
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