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首页> 外文期刊>Electrochimica Acta >Enhancement of Efficiency in Quantum Dot Sensitized Solar Cells Based on CdS/CdSe/CdSeTe Heterostructure by Improving the Light Absorption in the VIS-NIR Region
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Enhancement of Efficiency in Quantum Dot Sensitized Solar Cells Based on CdS/CdSe/CdSeTe Heterostructure by Improving the Light Absorption in the VIS-NIR Region

机译：基于Cds / Cdse / Cdsete异质结构的量子点敏化太阳能电池效率提高了通过改善Vis-Nir区域的光吸收

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摘要

In this work, we demonstrate an enhancement of photocurrent in QDSSCs based on CdS (QDs)/CdSe Quantum rods (QRs)/CdSeTe (QDs) heterostructure due to the increased photon harvesting in the VIS-NIR region. The photo-conversion efficiency increased from 2.7% up to 6.5% when CdSe QRs and CdSeTe QDs were added in the reference cell: TiO2/CdS/ZnS and the devices reached a maximum photocurrent of 21.5 mA cm(-2). This outstanding performance was caused by a broadening of the light absorption in the VIS and NIR regions, this in turn, was produced by the presence of CdSe QRs and CdSeTe QDs in the cells. The use of additional SiO2 layer in the solar cell that contained CdSe QRs and CdSeTe QDs allowed us to improve the efficiency of the cells even more (up to 7.4%), since it decreased the recombination rate produced by defects and interfaces in the QDs. Moreover, the effect on the solar cells performance was studied as the size of the CdSeTe QDs introduced into them increases and found that both, the values of photocurrent and efficiency are enhanced as the size of the CdSeTe increases. We associated this improvement of performance to the increase of light absorption in the NIR region as the size of the CdSeTe QDs increases. Hence, our results suggest that the strategy of adding CdSeTe QDs with different sizes together with CdSe QRs is promising to enhance the efficiency of QDSSCs. (C) 2017 Published by Elsevier Ltd.
机译：在这项工作中，我们证明了基于CDS（QDS）/ CDSE量子棒（QRS）/ CDSETE（QDS）异质结构的QDSSCS中的光电流增强由于VIS-NIR区域中的光子收获增加。当在参考电池中加入CDSE QRS和CDSETQDS时，光转换效率从2.7％增加到6.5％：TiO2 / Cds / Zns，并且所述器件达到21.5 mA cm（-2）的最大光电流。这种出色的性能是由于在VI和NIR区域的光吸收扩大，这又通过在细胞中存在CDSE QR和CDSET QD来产生的。在含有CDSE QRS和CDSETEQD的太阳能电池中使用额外的SiO2层，使我们能够提高细胞的效率（高达7.4％），因为它降低了QD中缺陷和界面产生的重组率。此外，研究了对太阳能电池性能的影响，因为引入它们的CDSET QD的尺寸增加并发现，光电流和效率的值随着CDSETE的尺寸而增强。随着CDSTEQDS的尺寸增加，我们将这种改进的性能提高到了NIR区域的光吸收的增加。因此，我们的结果表明，将CDS QD与CDSE QRS一起添加不同大小的CDS QDS的策略很有希望提高QDSSCS的效率。 （c）2017年由elestvier有限公司出版

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