Issue 11, 2018, Issue in Progress

Improved performance and stability of perovskite solar cells with bilayer electron-transporting layers

Abstract

Zinc oxide nanoparticles (NPs) are very promising in replacing the phenyl-C61-butyric acid methyl ester (PC61BM) as electron-transporting materials due to the high carrier mobilities, superior stability, low cost and solution processability at low temperatures. The perovskite/ZnO NPs heterojunction has also demonstrated much better stability than perovskite/PC61BM, however it shows lower power conversion efficiency (PCE) compared to the state-of-art devices based on perovskite/PCBM heterojunction. Here, we demonstrated that the insufficient charge transfer from methylammonium lead iodide (MAPbI3) to ZnO NPs and significant interface trap-states lead to the poor performance and severe hysteresis of PSC with MAPbI3/ZnO NPs heterojunction. When PC61BM/ZnO NPs bilayer electron transporting layers (ETLs) were used with a device structure of ITO/poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA)/MAPbI3/PC61BM/ZnO NPs/Al, which can combine the advantages of efficient charge transfer from MAPbI3 to PC61BM and excellent blocking ability of ZnO NPs against oxygen, water and electrodes, highly efficient PSCs with PCE as high as 17.2% can be achieved with decent stability.

Graphical abstract: Improved performance and stability of perovskite solar cells with bilayer electron-transporting layers

Article information

Article type
Paper
Submitted
09 Jan 2018
Accepted
01 Feb 2018
First published
06 Feb 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 5897-5901

Improved performance and stability of perovskite solar cells with bilayer electron-transporting layers

T. Jiang and W. Fu, RSC Adv., 2018, 8, 5897 DOI: 10.1039/C8RA00248G

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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