Control of the morphology of PbI2 films for efficient perovskite solar cells by strong Lewis base additives,Journal of Materials Chemistry C

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Control of the morphology of PbI2 films for efficient perovskite solar cells by strong Lewis base additives
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-06-16 00:00:00 , DOI: 10.1039/c7tc01973d
Xiaobing Cao _{1,

2,

3,

4,

5} , Lili Zhi _{2,

5,

6,

7} , Yahui Li _{1,

2,

3,

4,

5} , Fei Fang _{1,

2,

3,

4,

5} , Xian Cui _{1,

2,

3,

4,

5} , Youwei Yao _{3,

5,

8,

9,

10} , Lijie Ci _{2,

5,

6,

7} , Kongxian Ding _{5,

11,

12} , Jinquan Wei _{1,

2,

3,

4,

5}

Affiliation

A two-step method is widely used to fabricate highly efficient perovskite solar cells. In a typical two-step method, CH₃NH₃PbI₃ perovskites are fabricated from PbI₂ films through an intercalation reaction between PbI₂ and CH₃NH₃I, which usually have a rough surface and residual PbI₂ due to a compact PbI₂ structure. Here, we introduce some strong Lewis bases into PbI₂/DMF solutions in the first step, which is helpful in controlling the morphology of PbI₂ films with a mesoporous structure. The mesopores in the PbI₂ films provide not only space for accommodating the volume expansion during the reaction between PbI₂ and CH₃NH₃I, but also channels for CH₃NH₃I solution to diffuse into the PbI₂ films, which helps eliminate the residual PbI₂ and the dissolution and recrystallization process. As a result, smooth perovskite films without residual PbI₂ are easily obtained. The power conversion efficiency, stability and reproducibility of the perovskite solar cells fabricated from the optimized mesoporous PbI₂ films improved simultaneously due to the improvement in perovskite films. This work reveals the key roles of solvents (boiling point, Lewis basicity) in controlling the microstructure of the PbI₂ films.

中文翻译：

用强路易斯碱添加剂控制高效钙钛矿型太阳能电池的PbI ₂膜的形貌

两步法被广泛用于制造高效钙钛矿太阳能电池。在典型的两步法中，CH ₃ NH ₃ PbI ₃钙钛矿是通过PbI ₂和CH ₃ NH ₃ I之间的插入反应由PbI ₂膜制成的，由于紧凑的PbI ，它们通常具有粗糙的表面和残留的PbI _2。₂结构。在这里，我们首先将一些强路易斯碱引入PbI ₂ / DMF溶液中，这有助于控制具有介孔结构的PbI ₂膜的形态。PbI _2中的中孔薄膜不仅为容纳PbI ₂和CH ₃ NH ₃ I之间的反应过程中的体积膨胀提供了空间，而且还为CH ₃ NH ₃ I溶液扩散到PbI ₂膜中提供了通道，这有助于消除残留的PbI ₂和杂质。溶解和重结晶过程。结果，容易获得没有残留PbI _2的光滑钙钛矿膜。由优化的介孔PbI ₂制成的钙钛矿太阳能电池的功率转换效率，稳定性和可重复性由于钙钛矿膜的改进，膜同时得到改善。这项工作揭示了溶剂（沸点，路易斯碱度）在控制PbI ₂薄膜的微观结构中的关键作用。

更新日期：2017-08-03

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