Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer,The Journal of Physical Chemistry Letters

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Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-04-21 , DOI: 10.1021/acs.jpclett.1c01036
Wenda Shi _{1,

2} , Huanqing Ye _{3,

4}

Affiliation

A two-dimensional (2D) perovskite layer is considered to be a desirable defect passivation structure for the lifelong stability of perovskite solar cells (PSCs). However, the efficiency could be compromised behind the traditional PSCs. Herein, we solve this issue by employing a highly hydrophobic organic cation, 2-[4-(trifluoromethyl)phenyl]ethanamine (CF₃-PEA), to form a 2D (CF₃-PEA)₂PbI₄ to effectively passivate the 3D MAPbI₃ with fewer defects. The new 2D/3D-structured PSCs show reduced charge recombination, an elongated carrier lifetime, efficient charge generation and transport. Those excellent characters lead to a significant enhancement of the efficiency from 17.9% for pristine PSCs to 21.43% for 2D/3D PSCs. Benefiting from the high hydrophobicity of CF₃-PEA, the cells show remarkably improved stability by maintaining 83% of the original efficiency exposed to 80% R.H. and 50 °C for 600 h and 87% under 1 sun illumination for 600 h, which makes our PCSs among the most efficient and stable MAPbI3 solar cells.

中文翻译：

具有超疏水二维封盖层的高效稳定的钙钛矿太阳能电池

二维（2D）钙钛矿层被认为是钙钛矿太阳能电池（PSC）终生稳定性的理想缺陷钝化结构。但是，在传统PSC之后，效率可能会受到影响。在此，我们通过使用高度疏水的有机阳离子，2- [4-（三氟甲基）苯基]乙胺（CF解决这个问题₃ -PEA），以形成2D（CF ₃ -PEA）₂碘化铅₄有效地钝化3D MAPbI ₃缺陷少。新的2D / 3D结构的PSC显示出减少的电荷复合，延长的载流子寿命，有效的电荷产生和传输。这些出色的特性使原始PSC的效率从17.9％显着提高到2D / 3D PSC的21.43％。得益于CF ₃ -PEA的高疏水性，该电池通过在80％RH和50°C下暴露600小时保持原始效率的83％，在1个阳光下光照600小时保持87％的原始效率，从而显着提高了稳定性。我们的PCS属于最高效，最稳定的MAPbI3太阳能电池。

更新日期：2021-04-29

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