Investigation of Regeneration Kinetics in Quantum-Dots-Sensitized Solar Cells with Scanning Electrochemical Microscopy
详细信息 查看全文
- 作者：Bingyan Zhang ; Huailiang Yuan ; Xiaofan Zhang ; Dekang Huang ; Shaohui Li ; Mingkui Wang ; Yan Shen
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：December 10, 2014
- 年：2014
- 卷：6
- 期：23
- 页码：20913-20918
- 全文大小：307K
- ISSN：1944-8252
文摘
A fast quantum dots (QDs) regeneration process is necessary for highly efficient QDs-sensitized solar cells. Herein, CdSe and CdS QDs regeneration rates (kQD鈥? in three redox electrolytes, which are triiodide and iodide ions (I3鈥?/sup>/I鈥?/sup>), Co(bpy)3(PF6)2 and Co(bpy)3(PF6)3 (Co3+/Co2+), and 1-methy-1-H-tetrazole-5-thiolate and its dimer (T2/T鈥?/sup>), have been first investigated with scanning electrochemical microscopy (SECM). The results reveal that the kinetics of QDs regeneration depends on the nature of the QDs and the redox shuttles presented in QDSSCs. For QDs of CdSe and CdS, the regeneration rate (kQD鈥? in the case of a T2/T鈥?/sup>-based electrolyte is about two times larger than that of Co3+/Co2+ and I3鈥?/sup>/I鈥?/sup>. Additionally, the kQD鈥?for CdSe is about two times larger than that of CdS in the same redox shuttle electrolyte, which could be due to a large driving force for the reaction between the exited state quantum dots (QD+) and redox electrolytes.