Unraveling the Passivation Process of PbI2 to Enhance the Efficiency of Planar Perovskite Solar Cells,The Journal of Physical Chemistry C

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Unraveling the Passivation Process of PbI2 to Enhance the Efficiency of Planar Perovskite Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-09-12 , DOI: 10.1021/acs.jpcc.8b08075
Biao Shi _{1,

2,

3,

4} , Xin Yao _{1,

2,

3,

4} , Fuhua Hou _{1,

2,

3,

4} , Sheng Guo _{1,

2,

3,

4} , Yucheng Li _{1,

2,

3,

4} , Changchun Wei _{1,

2,

3,

4} , Yi Ding _{1,

2,

3,

4} , Yuelong Li _{1,

2,

3,

4} , Ying Zhao _{1,

2,

3,

4} , Xiaodan Zhang _{1,

2,

3,

4}

Affiliation

There appears to be a controversy on whether remnant PbI₂ is beneficial to the performance of perovskite solar cells (PSCs). We have shown that PSCs with residual PbI₂ deposited by one-step antisolvent solution and two-step evaporation-solution method both have shown better performance than those without excess PbI₂. X-ray diffraction with diverse X-ray incident angles combined with scanning electron microscopy and secondary-ion mass spectrometry is employed to identify the position of remnant PbI₂. It reveals that residual PbI₂ is located at grain boundaries near the perovskite/hole-transporting layer interface area for the one-step antisolvent solution method, and the two-step evaporation-solution method situates the excess PbI₂ at grain boundaries and the electron transport layer/perovskite interface. The cell performance implies that grain boundary passivation is beneficial for promoting short-circuit current density, while interface passivation is more favorable to enhance open-circuit voltage and fill factor. The revealed passivation process indicates a deep understanding of remnant PbI₂ and contributes to the development of PSCs.

中文翻译：

阐明PbI ₂的钝化过程以提高平面钙钛矿太阳能电池的效率

关于残留的PbI ₂是否对钙钛矿型太阳能电池（PSC）的性能有益似乎存在争议。我们已经表明，通过一步反溶剂溶液和两步蒸发溶液法沉积的具有残留PbI _2的PSC都比没有过量PbI _2的PSC具有更好的性能。采用具有不同X射线入射角的X射线衍射技术结合扫描电子显微镜和二次离子质谱法来鉴定残留PbI ₂的位置。结果表明残留的PbI ₂对于单步抗溶剂溶液法，PbI ₂位于钙钛矿/空穴传输层界面区域附近的晶界处，而两步蒸发-固溶法则将过量的PbI ₂位于晶界和电子传输层/钙钛矿界面处。电池性能表明晶界钝化有利于提高短路电流密度，而界面钝化则更有利于提高开路电压和填充系数。揭示的钝化过程表明对残留的PbI ₂有深入的了解，并有助于PSC的发展。

更新日期：2018-09-13

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