Long-term Stability and Degradation Mechanisms of Dye Sensitized Solar Cells with Nitrogen Doped TiO2 and Bis-benzimidazole Derivative Additives
博士 === 國立臺北科技大學 === 工程科技研究所 === 101 === The presence of water in DSSC concerns the role of water in photovoltaic performance and long-term stability. Reliable electrolyte additives and the modification of TiO2 diminishing the influences of water to the DSSC’s degradation process becomes a critical i...
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| Format: | Others |
| Language: | en_US |
| Published: |
2013
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| Online Access: | http://ndltd.ncl.edu.tw/handle/sgn363 |
| Summary: | 博士 === 國立臺北科技大學 === 工程科技研究所 === 101 === The presence of water in DSSC concerns the role of water in photovoltaic performance and long-term stability. Reliable electrolyte additives and the modification of TiO2 diminishing the influences of water to the DSSC’s degradation process becomes a critical issue to maintain an acceptable cell life-time. The effects of water content on the degradation behavior of dye sensitized solar cells were studied by adding water isotopes (H2O, D2O, andH218O) to the electrolytes. Results showed that the degradation rates of the cells in presence of water isotopes were in the order of H2O > D2O > H218O. The improvement of the bis-benzimidazole derivatives c in the increase of photovoltage and the long-term stability resulted that the effective protection of the ligands between dye and working electrodes from the attack by environmental water molecules. The reduction of the degradation with Nitrogen doped TiO2 DSSC resulted that decreasing the resistance of the back reaction revealed a higher short circuit current (Jsc) and efficiency after 6 months. The efficiency of Nitrogen doped TiO2 for DSSC remained 25% compared with the 10% of pure TiO2 for DSSC after 6 months radiation. The results suggest the water adsorption capability of nitrogen-doped TiO2 is lower than that of TiO2. The combination of Nitrogen doped TiO2 and bis-benzimidazole derivative additive in DSSC will be crucial for further improvement in device’s open circuit voltage (Voc) and Jsc.
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