Charge recombination control for high efficiency CdS/CdSe quantum dot co-sensitized solar cells with multi-ZnS layers
Charge recombination control for high efficiency CdS/CdSe quantum dot co-sensitized solar cells with multi-ZnS layers
复制标题
多层 ZnS 高效 CdS/CdSe 量子点共敏化太阳能电池的电荷复合控制
DOI：
10.1039/c7dt04356b
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发表时间：
2018
影响因子：
4
通讯作者：
Cao Haibin
中科院分区：
文献类型：
--
作者：
Wu Qiang;Hou Juan;Zhao Haifeng;Liu Zhiyong;Yue Xuanyu;Peng Shanglong;Cao Haibin
ZnS作为无机钝化剂已被证明在抑制量子点敏化太阳能电池（QDSC）中的电荷复合和提高功率转换效率（PCE）方面是有效的。本研究采用连续离子层吸附反应（SILAR）和化学浴沉积（CBD）方法，构建了一种新型的TiO_2/ZnS/CdS/ZnCdS/CdSe/ZnS光电极。系统地研究了多层ZnS薄膜对量子点太阳能电池光学和电化学性能的互补作用。多层ZnS不仅有利于量子点的生长和分布，而且有效地抑制了不同界面的电荷复合。我们认为在CBD过程中通过离子交换途径形成ZnCdS中间层有助于具有中间ZnS层的QDSC的更高光电化学电池性能。当三层ZnS用于CdS/CdSe共敏化体系时，PCE达到6.05%，这远高于常规单一ZnS处理和在CdS量子点和CdSe量子点与电解质之间的界面处插入两层ZnS的太阳能电池（分别为4.80%和5.42%）。
ZnS as an inorganic passivation agent has been proven to be effective in suppressing charge recombination and enhancing power conversion efficiency (PCE) in quantum dot-sensitized solar cells (QDSCs). In the present study, we constructed a novel TiO2/ZnS/CdS/ZnCdS/CdSe/ZnS photoelectrode via successive ionic layer adsorption and reaction (SILAR) and chemical bath deposition (CBD). The complementary effects of multi-ZnS layers on the optical and electrochemical performance of the QDSCs were systematically investigated. The multi-ZnS can not only facilitate the growth and distribution of QDs, but also suppress the different interface charge recombination effectively. We suggest that the formation of the ZnCdS intermediate layers via ion-exchange route during CBD process contributes to the higher photoelectrochemical cell performance of the QDSCs with the middle ZnS layer. When the three-layer ZnS was employed in CdS/CdSe co-sensitized system, the PCE reached 6.05%, which is much higher than that observed for solar cells with the conventional single ZnS treatments and the two layers inserted at the interface between CdS QDs and CdSe QDs and electrolyte (4.80% and 5.42%, respectively).