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影响染料敏感太阳能电池中电子注入效率的参数
Sara E Koops1, Brian C O'Regan, Piers R F Barnes
1Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
Journal of the American Chemical Society
|April 2, 2009
概括
在染料敏感太阳能电池 (DSSC) 中的电子注入从N719染料三重组状态开始发生. 电解质添加剂如tBP和Li+显著影响注入动态和光伏效率.
科学领域:
- 材料科学 材料科学 材料科学
- 太阳能光伏发电是如何实现的
- 纳米技术纳米技术
背景情况:
- 染料敏感太阳能电池 (DSSC) 是一个有前途的光伏技术.
- 从敏感剂染料到半导体的高效电子注入对于DSSC性能至关重要.
- 了解电子注入动态是优化DSSC效率的关键.
研究的目的:
- 为了研究N719敏感的TiO(2) DSSC中的电子注入动态和量子产量.
- 为了将电子注入动力学与整体设备性能相关联.
- 为了阐明电解质成分对电子注射的影响.
主要方法:
- 用时间解析的单光子计数来研究电子注射动态.
- 测量了设备性能指标,包括短路电流密度 (Jsc).
- 分析了电解质成分 (tBP,Li+) 的变化及其对TiO(2) 带能量的影响.
主要成果:
- 来自N719三重体状态的电子注入半衰期为200 +/- 60 ps,量子产量为84 +/- 5%.
- 注射动态在很大程度上独立于氧化还原对的存在,TiO(2) 合成pH值和电偏差.
- 三丁二 (tBP) 和酸通过转移TiO(2) 导电带能量来强烈影响注射动态.
- 一个100meV的带边移动会导致两倍的注入延迟.
- 电子注入量子收益率与装置Jsc.线性相关.
结论:
- 染料激发状态和TiO(2) 接受器状态之间的相对能量对于DSSC中的电子注入动态至关重要.
- 这些能量中的变化直接影响电子注入动力学,效率和光伏整体性能.
- 通过优化能量来最大限度地减少动力冗余对于最大限度地提高DSSC效率至关重要.
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