研究目的
Investigating the dynamic interface evolution and charge separation pathways in dye-sensitized solar cells (DSCs) under operando conditions using in situ/operando resonance Raman spectroscopy.
研究成果
In situ/operando RR spectroscopy allows noninvasive and nondestructive microscopic investigations of dynamic interface evolution in DSCs under operando conditions. Direct observation of the regeneration of dye and electrolyte-related molecules and interactions between charge separation pathways and molecular vibrations can supplement the existing mechanism of DSCs. The creation of new species and the existence of undesirable side processes were observed, providing new insights for the optimization of solar cell’s performance.
研究不足
The study focuses on a specific type of dye-sensitized solar cell (DSC) with a KI/I2 liquid electrolyte and N719 dye, which may not be directly applicable to other types of DSCs. The in situ/operando Raman spectroscopy technique, while powerful, may have limitations in sensitivity and resolution for detecting all possible interfacial phenomena.
1：Experimental Design and Method Selection:
In situ/operando resonance Raman spectroscopy was applied to investigate the photoinduced evolution of TiO2/N719/liquid–electrolyte DSCs under operando conditions by the use of laser excitation at
2：33 eV. Sample Selection and Data Sources:
A traditional KI/I2 liquid electrolyte DSC was used, employing a dye N719-sensitized regularly ordered TiO2 nanotube array (TNA) as the photoanode, and a fluorine-doped tin oxide (FTO) conductive glass coated with a thin layer of platinum (Pt) catalyst as the counter electrode.
3：List of Experimental Equipment and Materials:
Field emission-scanning electron microscope (FE-SEM) for imaging, Raman spectroscopy setup for in situ/operando analysis.
4：Experimental Procedures and Operational Workflow:
The preparation of the typical DSC consists of five steps. Under operando conditions, electrons should pass through the TNA layer to reach the FTO and flow to the external circuit in the DSC.
5：Data Analysis Methods:
Operando RR spectroscopy combined with photocurrent-voltage characteristics to determine the simultaneous in situ/operando observations of the DSC.
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