期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 37, 页码 14194-14203出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04570g
关键词
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资金
- MOST (973 projects) [2012CB932903, 2012CB932904]
- NSFC [91433205, 51372270, 51402348, 51421002, 21173260, 11474333, 91233202]
- Knowledge Innovation Program of Chinese Academy of Sciences
For quantum dot sensitized solar cells (QDSCs), optimizing interfacial structures by specifically developing new interfacial modification methods to minimize recombination associated with photo-generated carrier transportation and collection is an effective way to achieve highly efficient devices. In this respect, fumed SiO2 nanoparticles have been used as a polysulfide electrolyte additive for improving the interface in a TiO2/QDs/electrolyte for the first time. It was found that the fill factor (FF), open-circuit voltage (V-oc) and the cell performance of the devices are significantly enhanced. Additionally, a power conversion efficiency (PCE) of 11.23% is achieved, which is one of the highest efficiencies for liquid-junction QDSCs. Furthermore, the electron transport and recombination processes in the CdSexTe1-x QDSCs with the SiO2 modified electrolyte have been investigated. This revealed that the existence of SiO2 nanoparticles in the electrolyte can create an energy barrier for the recombination between photo-generated electrons from the QDs as well as the recombination between the electrolyte and the injected electrons from TiO2. It is encouraging that CdSexTe1-x QDSCs in SiO2 modified electrolytes can reach a higher electron collection efficiency (98%) and longer electron lifetime. This work provides a simple and convenient method to modify the TiO2/QDs/electrolyte interfaces of QDSCs.
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