文章基本信息

标题：Quantum-Dot-Sensitized Solar Cell with Unprecedentedly High Photocurrent
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作者：Jin-Wook Lee ; Dae-Yong Son ; Tae Kyu Ahn 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
期号：1
DOI：10.1038/srep01050
语种：English
出版社：Springer Nature
摘要：The reported photocurrent density (J_SC) of PbS quantum dot (QD)-sensitized solar cell was less than 19 mA/cm² despite the capability to generate 38 mA/cm², which results from inefficient electron injection and fast charge recombination. Here, we report on a PbS:Hg QD-sensitized solar cell with an unprecedentedly high J_SC of 30 mA/cm². By Hg²⁺ doping into PbS, J_SC is almost doubled with improved stability. Femtosecond transient study confirms that the improved J_SC is due to enhanced electron injection and suppressed charge recombination. EXAFS reveals that Pb-S bond is reinforced and structural disorder is reduced by interstitially incorporated Hg²⁺, which is responsible for the enhanced electron injection, suppressed recombination and stability. Thanks to the extremely high J_SC, power conversion efficiency of 5.6% is demonstrated at one sun illumination.