Aqueous synthesis of the CdTe NCs and influence of size on photovoltaic performance of the CdS/CdTe co-sensitized solar cells
Aqueous synthesis of the CdTe NCs and influence of size on photovoltaic performance of the CdS/CdTe co-sensitized solar cells
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DOI：
10.1016/j.jallcom.2019.06.025
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发表时间：
2019-09
影响因子：
6.2
通讯作者：
M. Marandi;F. Mirahmadi
中科院分区：
文献类型：
--
作者：
M. Marandi;F. Mirahmadi
本文采用热注射化学沉淀法合成了不同尺寸的CdTe纳米碳管。然后将它们作为共增敏剂应用于镉镉和硫化镉敏化太阳能电池的光电极中。光电极由水热法生长的纳米二氧化钛薄膜组成，纳米二氧化钛薄膜的主要尺寸为25 nm。通过连续离子层吸附与反应(SILAR)和滴注方法对该层进行了敏化处理。在实验中，所利用的CdTe纳米管的平均尺寸在2.7-3.4 nm范围内变化。这些QDSCs的常规结构中还采用了多硫化物电解液和CuS对电极。用制备的不同尺寸的CdTe纳米碳管制作了不同的光阳极。然后研究了相应的带隙能量和带边位置对敏化太阳能电池光伏性能的影响。结果表明，当回流时间为5h(3.2 nm)时，所制得的准差示扫描量热仪的效率最高可达3.8%。与仅用硫化镉NCS敏化的参比细胞相比，这一效率提高了约72%。根据QDSC各组成成分的能带图，进行了优化设计。
In this work CdTe NCs with different sizes were synthesized through a hot-injection chemical precipitation method. Then they were applied as the co-sensitizers in the photoelectrode of the CdTe and CdS sensitized solar cells. The photoelectrodes were composed of a nanocrystalline TiO2layer formed of hydrothermally grown TiO2NCs with dominant size of 25 nm. This layer was sensitized with CdS and CdTe NCs via the successive ionic layer adsorption and reaction (SILAR) and drop casting methods. The average size of utilized CdTe NCs was altered in the range of 2.7–3.4 nm in the experiments. Polysulfide electrolyte and CuS counter electrodes were also applied in conventional structure of these QDSCs. Different photoanodes were fabricated with various sizes of the as prepared CdTe NCs. Then the effect of corresponding bandgap energies and band edge positions on the photovoltaic performance of the CdS/CdTe sensitized solar cells was investigated. According to the results, a maximum efficiency of 3.8% was achieved for the QDSC with CdTe NCs prepared at 5h of refluxing process (3.2 nm). This efficiency was increased about 72% compared to the reference cell which was sensitized with just CdS NCs. The optimization was also addressed based on the energy band diagram of the composing components of the fabricated QDSCs.