Photoinduced Interfacial Electron Injection Dynamics in Dye-Sensitized Solar Cells under Photovoltaic Operating Conditions
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- 作者：Jo毛l Teuscher ; Jean-David D茅coppet ; Angela Punzi ; Shaik M. Zakeeruddin ; Jacques-E. Moser ; Michael Gr盲tzel
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：December 20, 2012
- 年：2012
- 卷：3
- 期：24
- 页码：3786-3790
- 全文大小：270K
- 年卷期：v.3,no.24(December 20, 2012)
- ISSN：1948-7185
文摘
We report a pump鈥損robe spectroscopy study of electron injection rates in dye-sensitized solar cell (DSSC) devices. We examine the case of working devices employing an N719 ruthenium sensitizer and an iodide electrolyte. Electron injection is found to occur mainly on a sub-100 fs time scale, followed by a slower component with a lifetime of 26.9 ps, in accordance with previous reports on model samples. The amplitude of this latter component varies with electrolyte composition from 25 to 9%. The appearance of slower components in the electron injection dynamics may be attributed to an aggregated or weakly bound state of the surface-adsorbed N719 sensitizer. Further measurements are reported varying the cell light bias and load conditions, revealing no influence on electron injection dynamics. No other electron injection event is found to occur up to 1 ns. These results show no evidence for a slowdown of electron injection under working conditions compared to model systems for the electrolytes examined in this study.