CdS and CdSe quantum dot co-sensitized nanocrystalline TiO2 electrode: Quantum dot distribution, thickness optimization, and the enhanced photovoltaic performance

CdS and CdSe quantum dot co-sensitized nanocrystalline TiO2 electrode: Quantum dot distribution, thickness optimization, and the enhanced photovoltaic performance
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CdS和CdSe量子点共敏化纳米晶TiO2电极:量子点分布、厚度优化和增强的光伏性能

DOI:
10.1016/j.jpowsour.2014.09.148
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发表时间:
2015
影响因子:
9.2
通讯作者:
Zhu, Jun
Zhu, Jun
中科院分区:
工程技术2区
文献类型:
--
作者:
Deng, Zanhong;Shao, Jingzhen;Hu, Linhua;Zhu, Jun

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采用丝网印刷法制备了不同厚度的纳米TiO 2薄膜,并采用连续离子层吸附反应(SILAR)法在TiO 2薄膜上依次沉积了CdS和CdSe量子点。结果表明,随着TiO 2纳米薄膜厚度的增加,量子点数量显著减少,量子点尺寸显著增大,量子点尺寸分布向大尺寸方向移动.此外,还得到了CdS/CdSe量子点在TiO 2纳米粒子薄膜中分布的定性模型。在优化TiO 2薄膜厚度后,采用10 μm左右的纳米晶TiO 2电极和Pt对电极的量子点敏化太阳能电池(QDSC)在1个太阳光照下(100 mW cm−2,AM 1.5 G)获得了3.26 ± 0.10%的相对高的功率转换效率。
The anatase TiO2nanoparticle films with different thicknesses have been fabricated through screen printing method, and CdS and CdSe quantum dots (QDs) have been deposited on TiO2films in turn through successive ionic layer adsorption and reaction (SILAR) method. It has been found that the amount of QDs decreases significantly and the size of QDs increases obviously with the depth increasing in TiO2nanoparticle films, and the size distribution of QDs shifts to large-size direction with the TiO2film thickness increasing. Furthermore, a qualitative model of CdS/CdSe quantum dot distribution in TiO2nanoparticle films has been obtained. After optimizing the TiO2film thickness, the quantum dot-sensitized solar cells (QDSCs) with about 10 μm thick nanocrystalline TiO2electrodes and Pt counter electrodes have reached relatively high power conversion efficiencies of 3.26 ± 0.10% under one sun illumination (100 mW cm−2, AM 1.5 G).
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