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High-efficiency and UV-stable flexible perovskite solar cells enabled by an alkaloid-doped C60 electron transport layer

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Abstract

The inferior stability of perovskite solar cells (PSCs) under ultraviolet (UV) irradiation has been a bottleneck for their further commercialization. Herein, we report a simple strategy to enhance the UV stability of PSCs by using an alkaloid 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) doped C60 electron transport layer (ETL). By improving the electron mobility of ETLs to 2 cm2 Vāˆ’1 sāˆ’1 and optimizing the conduction band position to 4.2 eV, the DBU-doped C60 (DBU-C60) ETLs enable the rigid and flexible planner n-i-p PSCs to exhibit PCEs of 20% and 16%, respectively. Most importantly, the devices based on the DBU-C60 ETLs retain over 80% of their initial efficiency after storage either under UV irradiation for 336 h or light socking for 1000 h in an ambient environment. These results indicate that the optimized C60 is a promising electron transport material to stabilize the PSCs under UV light illumination without the cost of efficiency loss.

Graphical abstract: High-efficiency and UV-stable flexible perovskite solar cells enabled by an alkaloid-doped C60 electron transport layer

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Supplementary files

Article information


Submitted
21 May 2020
Accepted
29 Jun 2020
First published
30 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

High-efficiency and UV-stable flexible perovskite solar cells enabled by an alkaloid-doped C60 electron transport layer

X. He, C. Liu, Y. Yang, Y. Ding, S. Ma, Y. Wu, Y. Tao, X. Liu, M. Cai and S. Dai, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC02438D

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