Bailes M, Cameron P J, Lobato K, Peter L M
Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom.
J Phys Chem B. 2005 Aug 18;109(32):15429-35. doi: 10.1021/jp050822o.
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.
染料敏化纳米晶太阳能电池（DSCs）中的电子传输和复合受到二氧化钛颗粒中陷阱态的强烈影响，并且根据光照强度，在接触点处光注入电子的收集可能需要从毫秒到秒不等的时间。已经开发出一种直接方法来确定导致电子传输减慢的陷阱态的密度和能量分布。该方法包括在一段光照时间后将电池从开路切换到短路，以提取被捕获的电子。这种电荷提取方法的一个优点是，与其他方法相比，它对导电玻璃基板上电子转移导致的DSC分流不太敏感。将在DSCs（有和没有致密TiO₂阻挡层）上进行电荷提取测量得到的结果与通过开路光电压衰减分析获得的结果进行了比较。
