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Quantum-Dot-Sensitized Solar Cell with Unprecedentedly High Photocurrent

2013; Nature Portfolio; Volume: 3; Issue: 1 Linguagem: Inglês

10.1038/srep01050

2045-2322

Jin‐Wook Lee, Dae-Yong Son, Tae Kyu Ahn, Hee-Won Shin, In Young Kim, Seong‐Ju Hwang, Min Jae Ko, Soohwan Sul, Hyouksoo Han, Nam‐Gyu Park,

Advanced Photocatalysis Techniques

The reported photocurrent density (JSC) 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 JSC of 30 mA/cm2. By Hg2+ doping into PbS, JSC is almost doubled with improved stability. Femtosecond transient study confirms that the improved JSC 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 JSC, power conversion efficiency of 5.6% is demonstrated at one sun illumination.