Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%
Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%
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表面%20工程%20of%20PbS%20量子%20dot%20敏化%20太阳能%20细胞%20with%20a%20转换%20效率%20超越%207%
DOI：
10.1039/c6ta02465c
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Zhong, Xinhua
中科院分区：
文献类型：
--
作者：
Jiao, Shuang;Wang, Jin;Zhong, Xinhua
报道的PbS量子点敏化太阳能电池（QDSC）的功率转换效率（PCE）通常低于6%。这种低效率主要是由于量子点内部和量子点/TiO 2/电解质界面处的电荷复合严重。本工作通过离子交换法制备了具有核/壳结构的PbS/CdS量子点，并将其作为光敏剂用于敏化太阳能电池的制备。由于PbS量子点表面陷阱态缺陷的减少以及由此产生的对不利电荷复合的有效抑制，PbS/CdS量子点基电池与原始PbS基QDSC相比得到了显著改善。通过优化CdS壳层的厚度，在一个完整的太阳光照下，在所制造的设备上获得了7.19%的PCE，这是液体结PbS QDSC的最佳性能之一。
The power conversion efficiencies (PCEs) of PbS quantum dot sensitized solar cells (QDSCs) reported are typically below 6%. This poor efficiency is mainly derived from the serious charge recombination in internal QDs and at the interface of QDs/TiO2/electrolyte. In this work, PbS/CdS QDs with a core/shell structure, which were used as the photosensitizer to fabricate sensitized solar cells, were prepared through the ion exchange method. With the reduced trapping state defects on the surface of the PbS QDs and resulting effective suppression of adverse charge recombination, the PbS/CdS QD-based cells have been improved remarkably in comparison with the pristine PbS-based QDSCs. By optimization of the thickness of the CdS shell, a PCE of 7.19% under one full sun illumination was obtained on the fabricated devices, which is among the best performances for liquid-junction PbS QDSCs.