Tunability of the Band Energetics of Nanostructured SrTiO3 Electrodes for Dye-Sensitized Solar Cells
Tunability of the Band Energetics of Nanostructured SrTiO3 Electrodes for Dye-Sensitized Solar Cells
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DOI：
10.1021/jp9117979
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发表时间：
2010-02
影响因子：
3.7
通讯作者：
Shuming Yang;Huizhi Kou;Jichao Wang;Hongbin Xue;Huili Han
中科院分区：
文献类型：
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作者：
Shuming Yang;Huizhi Kou;Jichao Wang;Hongbin Xue;Huili Han
用光谱电化学方法测定了纳米结构SrTiO_3电极在丙腈（PN）、乙酰丙酮（Acetylacetone）和PN/Acetylacetone溶液中的平带边（Efb）。具体地，当仅使用四丁基过氯化铵（TBAP）作为支持电解质时，测量到非常负的Efb，而添加Li+离子使Efb正移。通过时间分辨电流的测量研究了陷阱态的分布。在PN、PN/Pdfc和Pdfc中测定的总陷阱态密度分别为5.51 × 1016、2.80 × 1016和1.83 × 1016 cm-2（均含0.2 mol·L-1 TBAP）的陷阱分布最大值分别位于-2.4、-1.6和-1.5 V。Li+的加入也降低了陷阱态密度，在PN、PN/NaClc和NaClc（均含有0.2 mol·L-1 TBAP和0.5 mol·L-1 LiClO 4）中，总陷阱态密度分别为4.19 × 1016、2.38 × 1016和1.19 × 1016 cm-2。最后用染料敏化纳米结构SrTiO 3电极。
The flat band edges (Efb) of nanostructured SrTiO3 electrodes have been determined in propionitrile (PN), acetylacetone (Acac), and PN/Acac with spectroelectrochemistry measurements. Specifically, a very negative Efb was measured when only tetrabutylammonium perchloride (TBAP) was used as supporting electrolyte, while addition of Li+ ions shifts Efb positively. The trap state distribution was investigated by the measurements of time-resolved current. The total trap state densities of 5.51 × 1016, 2.80 × 1016, and 1.83 × 1016 cm−2 were determined in PN, PN/Acac, and Acac (all containing 0.2 mol·L−1 TBAP), respectively, with trap distribution maximum located at −2.4, −1.6, and −1.5 V. The addition of Li+ also reduced the trap state densities, and the total trap state densities were calculated to be 4.19 × 1016, 2.38 × 1016, and 1.19 × 1016 cm−2 in PN, PN/Acac, and Acac (all containing 0.2 mol·L−1 TBAP and 0.5 mol·L−1 LiClO4), respectively. Finally the nanostructured SrTiO3 electrode was sensitized with dye ...