Performance and Stability Enhancement of Dye-Sensitized and Perovskite Solar Cells by Al Doping of TiO2
Performance and Stability Enhancement of Dye-Sensitized and Perovskite Solar Cells by Al Doping of TiO2
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DOI：
10.1002/adfm.201401658
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发表时间：
2014-10-15
影响因子：
19
通讯作者：
Steiner, Ullrich
中科院分区：
文献类型：
--
作者：
Pathak, Sandeep K.;Abate, A.;Steiner, Ullrich
在惰性环境中，在含介孔TiO 2的器件中观察到可逆的光致性能劣化。这种现象与由于金属氧化物的非化学计量而引起的深陷阱位点的活化相关。有趣的是，在空气中，这些缺陷可以通过氧吸附而钝化。这些结果表明，掺杂的二氧化钛与铝有一个显着的影响的子隙态的密度和提高导电性的数量级。采用Al掺杂的TiO 2的染料敏化和钙钛矿太阳能电池具有增加的器件效率和显著增强的在惰性气氛中的操作器件稳定性。这种性能和稳定性的增强是由于替代纳入铝的晶格中，永久钝化电子陷阱网站在体和表面的二氧化钛。
Reversible photo-induced performance deterioration is observed in mesoporous TiO2-containing devices in an inert environment. This phenomenon is correlated with the activation of deep trap sites due to astoichiometry of the metal oxide. Interestingly, in air, these defects can be passivated by oxygen adsorption. These results show that the doping of TiO2 with aluminium has a striking impact upon the density of sub-gap states and enhances the conductivity by orders of magnitude. Dye-sensitized and perovskite solar cells employing Al-doped TiO2 have increased device efficiencies and significantly enhanced operational device stability in inert atmospheres. This performance and stability enhancement is attributed to the substitutional incorporation of Al in the anatase lattice, permanently passivating electronic trap sites in the bulk and at the surface of the TiO2.