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In Situ Cesium Modification at Interface Enhances the Stability of Perovskite Solar Cells

In Situ Cesium Modification at Interface Enhances the Stability of Perovskite Solar Cells

Yao Zhao, Yicheng Zhao, Wenke Zhou, Qi Li, Rui Fu, Dapeng Yu, Qing Zhao

ACS Appl Mater Interfaces. 2018 Oct 3;10(39):33205-33213.

PMID: 30179000

Abstract:

A consensus has been reached that organic transport layer (e.g., Spiro-OMeTAD) in perovskite solar cell (PSC) is prone to be impact by mobile ions in perovskite film during long-term operation. Here, we incorporate cesium acetate as a buffer layer into perovskite solar cells to mitigate this detrimental behavior, in which cesium acetate is sandwiched between perovskite and organic transport layer. The mobile ions that migrate toward the organic transport layer (e.g., MA+) are gradually consumed by cesium acetate, resulting in cesium-rich perovskite at the interface. This in situ reaction and the subsequent Cs incorporation greatly enhance the operational stability of PSC without efficiency loss. The optimized PSC presents a power conversion efficiency of 20.9% with an open-circuit voltage of 1.18 V, maintaining ∼80% of its initial efficiency after 4500 min continuous operation at maximum power point. This new strategy opens up a new opportunity for fabricating stable perovskite solar cells.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP3396110	Cesium acetate		3396-11-0	Price

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