ZnO/CdS纳米柱阵列太阳电池中光电转化效率的研究
首发时间:2012-12-07
摘要:ZnO纳米柱阵列具有迁移率高、比表面积大、易制备等优点被认为是理想的量子点敏化太阳电池光阳极材料。采用简易的水热法在FTO(F:SnO2)衬底上制备了ZnO纳米柱阵列,并通过连续离子层吸附反应(SILAR)法在ZnO上原位沉积CdS量子点制备ZnO/CdS光阳极,研究了不同SILAR循环次数对电池光电转化效率(IPCE)的影响。结果表明,CdS拓宽了对可见光区的吸收,增强了对太阳光的利用率,同时,CdS与ZnO构成Ⅱ型异质结增加了电子注入量子效率(ηinj),IPCE显著增加。10次循环前,随着循环次数的增加,ZnO/CdS异质结界面增多,增加了电子和空穴的有效分离,并且CdS量子点增多,增强了对可见光的光捕获效率,IPCE逐渐上升;10次循环后,随着循环次数的进一步增加,CdS量子点层逐渐变厚,增加了光生载流子被缺陷捕获的几率,ηinj开始大幅减小,导致IPCE逐渐下降。
关键词: 太阳电池 ZnO纳米柱 CdS量子点 光电转化效率 电子注入量子效率
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A study on incident photon-to-current conversion efficiency of the ZnO/CdS nanorods arrays solar cell
Abstract:Highly ordered, single-crystalline ZnO nanorod arrays (NRAs) would be the most desirable nanostructure in quantum dot-sensitized solar cells because of their efficient charge separation and transport properties. Vertically aligned ZnO NRAs have been fabricated by a facile hydrothermal method, and followed by in situ depositing CdS quantum dots (QDs) on ZnO by a successive ionic layer adsorption and reaction (SILAR) method. The effect of the number of SILAR cycles on the incident photon-to-current conversion efficiency (IPCE) was investigated. The experiments show that IPCE enhances sharply and broadens to the visible light area after the deposition of CdS QDs, leading to improve the utilization rate of the sun energy. Meanwhile, IPCE increases gradually with increasing SILAR sycles before 10 cycles, which is not only for increasing the light harvesting efficiency, but also for forming more II-type semiconductor heterojunction at the ZnO/CdS interface and increasing the charge-injection efficiency(ηinj). However, IPCE begins to fall after 10 cycles, which is caused by poor ηinj with the additional increased amount of CdS QDs.
Keywords: solar cells ZnO nanorod arrays CdS quantum dots incident photon-to-current conversion efficiency charge-injection efficiency
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