Thermodynamically Driven Surface Dedoping of Nb-Doped TiO2 for Stable Perovskite Solar Cells,The Journal of Physical Chemistry C

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Thermodynamically Driven Surface Dedoping of Nb-Doped TiO2 for Stable Perovskite Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-09 , DOI: 10.1021/acs.jpcc.0c01608
Chang Cheng _{1,

2} , Na Li ₂ , Zhijian Wang ₂ , Hongxia Zhang _{1,

2} , Jiazang Chen ₂

Affiliation

In perovskite solar cells, the interfacial transfer of photogenerated electrons from the photoactive layers to TiO₂ mesoporous layers is the key step that determines the power conversion efficiency and stability of the devices and is influenced by the contact condition. Although foreign element doping can facilitate the extraction of electrons from the perovskite layers, the increase in the number of electronic states on the surface of semiconductor scaffolds will undesirably aggravate the charge recombination. In this work, we manage to dedope the foreign element from the surface of Nb-doped TiO₂ nanostructures via moderate temperature treatment. By doing this, the remaining lattice expansion of the dedoped surface can reduce the lattice mismatching between the anatase and the perovskite, therefore not only facilitating the electronic interaction but also alleviating the interfacial strain on temperature changes. Besides, the surface dedoping can also protect the cells from UV degradation by suppressing the survival of holes generated in the TiO₂ skeleton.

中文翻译：

Nb掺杂的TiO _2的热力学驱动表面去掺杂用于稳定钙钛矿太阳能电池

在钙钛矿太阳能电池中，光生电子从光敏层到TiO ₂介孔层的界面转移是决定器件功率转换效率和稳定性的关键步骤，并受接触条件的影响。尽管外来元素掺杂可以促进从钙钛矿层中提取电子，但是半导体支架表面上电子态数量的增加将不合需要地加剧电荷复合。在这项工作中，我们设法从Nb掺杂的TiO ₂表面去除杂质元素通过中等温度处理的纳米结构。通过这样做，去掺杂表面的剩余晶格膨胀可以减少锐钛矿和钙钛矿之间的晶格失配，因此，不仅促进了电子相互作用，而且减轻了温度变化时的界面应变。此外，表面去掺杂还可以通过抑制TiO ₂骨架中产生的空穴的存活来保护细胞免受紫外线降解。

更新日期：2020-07-09

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