Determination of the density and energetic distribution of electron traps in dye-sensitized nanocrystalline solar cells.
Determination of the density and energetic distribution of electron traps in dye-sensitized nanocrystalline solar cells.
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DOI：
10.1021/jp050822o
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
M. Bailes;P. Cameron;K. Lobato;L. Peter
中科院分区：
文献类型：
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作者：
M. Bailes;P. Cameron;K. Lobato;L. Peter
染料敏化纳米晶太阳能电池（DSC）中的电子传输和复合受到二氧化钛颗粒中存在的捕获态的强烈影响，并且在接触处收集光注入电子可能需要毫秒至秒的时间，这取决于照明强度。本文提出了一种直接测定导致电子输运减慢的俘获态密度和能量分布的方法。它涉及通过在照射一段时间后将电池从开路切换到短路来提取捕获的电子。这种电荷提取方法的优点在于，它比其他方法对通过在导电玻璃基板处的电子转移的DSC分流不太敏感。从电荷提取测量DSC（有和没有紧凑的TiO（2）阻挡层）的结果进行了比较，通过分析开路光电压衰减。
Electron transport and recombination in dye-sensitized nanocrystalline solar cells (DSCs) are strongly influenced by the presence of trapping states in the titanium dioxide particles, and collection of photoinjected electrons at the contact can require times ranging from milliseconds to seconds, depending on the illumination intensity. A direct method of determining the density and energetic distribution of the trapping states responsible for slowing electron transport has been developed. It involves extraction of trapped electrons by switching the cell from an open circuit to a short circuit after a period of illumination. An advantage of this charge extraction method is that it is less sensitive than other methods to shunting of the DSC by electron transfer at the conducting glass substrate. Results derived from charge extraction measurements on DSCs (with and without compact TiO(2) blocking layers) are compared with those obtained by analysis of the open circuit photovoltage decay.