Polydisperse aggregates of ZnO nanocrystallites: A method for energy-conversion-efficiency enhancement in dye-sensitized solar cells
Polydisperse aggregates of ZnO nanocrystallites: A method for energy-conversion-efficiency enhancement in dye-sensitized solar cells
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DOI：
10.1002/adfm.200701073
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发表时间：
2008-06-11
影响因子：
19
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Zhang, Qifeng;Chou, Tammy P.;Cao, Guozhong
制备了由多分散或单分散纳米晶组成的ZnO薄膜，并对其作为染料敏化太阳能电池电极进行了研究。结果表明，ZnO聚集体的平均尺寸或尺寸分布对电池的整体能量转换效率都有显著影响。由直径为120 ~ 360nm的多分散ZnO聚集体形成的薄膜的总能量转换效率最高，约为4.4%。亚微米大小的ZnO聚集体的光散射解释了通过延长光传播距离从而提高光电极膜的光收集效率来改善太阳能电池性能的原因。聚集体尺寸的广泛分布为ZnO薄膜提供了更好的填料和增强的散射入射光的能力，从而提高了太阳能电池的性能。
ZnO films consisting of either polydisperse or monodisperse aggregates of nanocrystallites were fabricated and studied as dye-sensitized solar-cell electrodes. The results revealed that the overall energy-conversion efficiency of the cells could be significantly affected by either the average size or the size distribution of the ZnO aggregates. The highest overall energy-conversion efficiency of similar to 4.4% was achieved with the film formed by polydisperse ZnO aggregates with a broad size distribution from 120 to 360nm in diameter. Light scattering by the submicrometer-sized ZnO aggregates was employed to explain the improved solar-cell performance through extending the distance travelled by light so as to increase the light-harvesting efficiency of photoelectrode film. The broad distribution of aggregate size provides the ZnO films with both better packing and an enhanced ability to scatter the incident light, and thus promotes the solar-cell performance.