Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (4): 822-827.doi: 10.3866/PKU.WHXB201602262

• COMMUNICATION • Previous Articles     Next Articles

Sulfide-Based Ionic Liquid Electrolyte Widening the Application Temperature Range of Quantum-Dot-Sensitized Solar Cells

Ji-Fu SHI1,Qi-Zhang HUANG1,2,Qing-Cui WAN1,Xue-Qing XU1,*(),Chun-Sheng LI3,*(),Gang XU1,*()   

  1. 1 Guangzhou Institute of Energy Conversion, Key Laboratory of Renewable Energy and Gas Hydrate, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
    2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
    3 College of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, Hebei Province, P. R. China
  • Received:2016-01-22 Published:2016-04-07
  • Contact: Xue-Qing XU,Chun-Sheng LI,Gang XU E-mail:xuxq@ms.giec.ac.cn;lichsheng@163.com;xugang@ms.giec.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21103194, 51506205);Science and Technology Planning Project ofGuangdong Province, China(2014A010106018, 2013A011401011);Guangdong-Hong Kong Joint Innovation Project of Guangdong Province, China(2014B050505015);Special Support Program of Guangdong Province, China(2014TQ01N610);Director Innovation Foundation of GuangzhouInstitute of Energy Conversion, China(y307p81001);Solar Photothermal Advanced Materials Engineering Research Center Construction Projectof Guangdong Province, China(2014B090904071)

Abstract:

We report the preparation and application of a 1-methyl-3-propylimidazolium sulfide-based ionic liquid electrolyte for quantum-dot-sensitized solar cells. By optimizing the concentrations of S and Na2S, a considerable conductivity of 12.96 mS·cm-1 is achieved at 25℃. Differential scanning calorimetry indicates that the glass transition temperature of the electrolyte is-85℃. The quantum-dot-sensitized solar cell assembled with this ionic liquid electrolyte displays a high energy conversion efficiency (η) of 3.03% at 25℃, which is comparable to the efficiency of quantum-dot-sensitized solar cells using a water-based polysulfide electrolyte (η= 3.34%). Due to the favorable thermal properties of this ionic liquid electrolyte (lower glass transition temperature and nonvolatility at higher temperatures), the quantum-dot-sensitized solar cell maintains satisfactory η even at-20℃ (η= 2.32%) and 80℃ (η= 1.90%), which is superior to the cell using the water-based polysulfide electrolyte.

Key words: Quantum-dot-sensitized solar cell, Ionic liquid electrolyte, 1-Methyl-3-propylimidazolium sulfide, Application temperature, Efficiency

MSC2000: 

  • O646