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Carbon Counter-Electrode-Based Quantum-Dot-Sensitized Solar Cells with Certified Efficiency Exceeding 11%
- Carbon Counter-Electrode-Based Quantum-Dot-Sensitized Solar Cells with Certified Efficiency Exceeding 11%
- Du, Zhonglin; Pan, Zhenxiao; Fabregat-Santiago, Francisco; Zhao, Ke; Long, Donghui; Zhang, Hua; Zhao, Yixin; Zhong, Xinhua; Yu, Jong-Sung; Bisquert, Juan
- DGIST Authors
- Yu, Jong-Sung
- Issue Date
- Journal of Physical Chemistry Letters, 7(16), 3103-3111
- Article Type
- Carbon Counter Electrodes; Carbon Films; Catalyst Activity; Confined Areas; Copper; Counter Electrodes; Efficiency; Electrodes; Electrolytes; Mesh Generation; Mesoporous Carbon; Nanocrystals; Polyelectrolytes; Polysulfides; Quantum Dot-Sensitized Solar Cells; Redox Potentials; Redox Reactions; Semiconductor Quantum Dots; Solar Cells; Submillimeters; Three Dimensions
- The mean power conversion efficiency (PCE) of quantum-dot-sensitized solar cells (QDSCs) is mainly limited by the low photovoltage and fill factor (FF), which are derived from the high redox potential of polysulfide electrolyte and the poor catalytic activity of the counter electrode (CE), respectively. Herein, we report that this problem is overcome by adopting Ti mesh supported mesoporous carbon (MC/Ti) CE. The confined area in Ti mesh substrate not only offers robust carbon film with submillimeter thickness to ensure high catalytic capacity, but also provides an efficient three-dimension electrical tunnel with better conductivity than state-of-art Cu2S/FTO CE. More importantly, the MC/Ti CE can down shift the redox potential of polysulfide electrolyte to promote high photovoltage. In all, MC/Ti CEs boost PCE of CdSe0.65Te0.35 QDSCs to a certified record of 11.16% (Jsc = 20.68 mA/cm2, Voc = 0.798 V, FF = 0.677), an improvement of 24% related to previous record. This work thus paves a way for further improvement of performance of QDSCs. © 2016 American Chemical Society.
- American Chemical Society
- Related Researcher
Light, Salts and Water Research Group
Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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- Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles
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