Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long‐Term Stable Perovskite Solar Cell,Advanced Functional Materials

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Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long‐Term Stable Perovskite Solar Cell
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-02-04 , DOI: 10.1002/adfm.201808119
Hua Dong _{1,

2} , Jun Xi ₃ , Lijian Zuo ₄ , Jingrui Li ₅ , Yingguo Yang ₆ , Dongdong Wang ₇ , Yue Yu _{7,

8} , Lin Ma ₈ , Chenxin Ran _{1,

2} , Weiyin Gao ₁ , Bo Jiao ₁ , Jie Xu ₁ , Ting Lei ₁ , Feijie Wei ₁ , Fang Yuan ₁ , Lin Zhang ₁ , Yifei Shi ₁ , Xun Hou ₁ , Zhaoxin Wu _{1,

2}

Affiliation

Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win‐win situation of both performance and stability, an innovative conjugated aniline modifier (3‐phenyl‐2‐propen‐1‐amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi‐coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built‐in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA‐modified solar cell can be obtained, accompanied by long‐term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm².

中文翻译：

共轭分子“桥”：功能配体对高效和长期稳定的钙钛矿太阳能电池

界面配体钝化工程最近被认为是一种有前途的途径，同时为钙钛矿型太阳能电池的光电特性和耐湿/耐操作性做出了贡献。为了进一步实现性能和稳定性的双赢局面，人们探索了一种创新的共轭苯胺改性剂（3-苯基-2-丙烯-1-胺； PPEA）来适度地定制卤化钙钛矿有机铅薄膜。在这里，共轭PPEA既表现出“准共面”刚性几何构型，又表现出独特的电子离域特征。经过适度的处理后，可以在钙钛矿/传输界面处形成一个更强的偶极覆盖层，以实现良好的能带排列，从而扩大内在的电势并促进电荷提取。同时，与钙钛矿晶粒/单元的表面配位的共轭阳离子可以形成优选有序的重叠，不仅钝化了表面缺陷，而且提供了用于电荷交换的快速路径。受益于此，PPEA改性太阳能电池的效率可达到≈21％，并具有长期稳定性（在1000 h测试，25°C和40±10湿度下保持90.2％的初始功率转换效率）。这种创新的共轭分子“桥”也可以更大规模地发挥作用，在1.96厘米的面积上具有18.43％的性能并具有长期稳定性（在1000 h测试，25°C和40±10湿度下保持90.2％的初始功率转换效率）。这种创新的共轭分子“桥”也可以更大规模地发挥作用，在1.96厘米的面积上具有18.43％的性能并具有长期稳定性（在1000 h测试，25°C和40±10湿度下保持90.2％的初始功率转换效率）。这种创新的共轭分子“桥”也可以更大规模地发挥作用，在1.96厘米的面积上具有18.43％的性能²。

更新日期：2019-02-04

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