表面负荷决定了通过单片裂变的三重生产在Anthradithiophene敏感的TiO2电影中
Melissa K Gish1, Katherine Snell1, Karl J Thorley2
1Materials, Chemistry and Computational Sciences Directorate, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.
概括
染料敏感太阳能电池中的单片裂变通过控制染料方向来增强. 优化单个碳酸基的染料表面覆盖率可以提高三重组的产量,而不是双重碳酸基.
科学领域:
- 太阳能光伏和可再生能源
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 单片裂变 (SF) 将一个高能单片激发状态转化为两个低能三重激发状态.
- SF是一个有希望的策略,以提高染料敏感太阳能电池 (DSSC) 的效率.
- 控制在半孔金属氧化物表面上的染料定向对于最大限度地提高SF和最大限度地减少停用至关重要.
研究的目的:
- 研究染料表面覆盖面和定群对DSSC中的SF的影响.
- 了解在中孔界面上的分子相互作用,以优化三重激发状态生成.
- 确定最佳的染料负载,以实现高效的单片裂变在基于基的DSSC中.
主要方法:
- 合成了两种具有一个或两个碳酸基基的二氧化染料.
- 在加载溶液中的多种染料度,用于沉积在半孔金属氧化物表面上.
- 采用超快的短暂吸收光谱来研究光物理和兴奋状态动态.
主要成果:
- 单碳酸功能化染料的表面覆盖率增加,通过单片裂变增强了三倍激发状态的增长.
- 双碳酸功能性染料的表面覆盖率增加并没有显示出三倍生长的类似增强.
- 染料的方向和分子间相互作用显著影响了界面上的单片裂变效率.
结论:
- 染料表面覆盖面和固群的数量极大地影响了DSSC单片裂变效率.
- 与双组相比,单个碳酸基团促进单片裂变的有利分子安排.
- 这项工作提供了对控制界面分子相互作用的见解,以提高太阳能电池性能.
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