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Issue 7, 2019
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Energy level-modulated non-fullerene small molecule acceptors for improved VOC and efficiency of inverted perovskite solar cells

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Abstract

The electron transport layer (ETL) plays a significant role in advancing the high efficiency and stability of solution-processed perovskite solar cells (PVSCs). Here, three commercialized n-type non-fullerene small molecule acceptors (IT-4X) with modulated energy levels are introduced as excellent alternative ETLs to replace the commonly used fullerene-based ETL in planar inverted PVSCs. The best-performing PVSCs are constructed by using the IT-4M as the ETL with a champion power conversion efficiency (PCE) of 17.65%, which is superior to that of the typical PCBM-based device. Among the PVSCs based on the three IT-4X ETLs, the differences of photovoltaic performances mainly exist in open-circuit voltage (VOC) and PCE, which are closely related to the built-in potential in PVSCs, directly influenced by the varied LUMOs of the IT-4X molecules. Furthermore, because of the superior hydrophobic properties, all the PVSCs based on IT-4X ETLs show improved long-term stability in the ambient atmosphere compared to the reference devices. In addition, the IT-4X molecules also deliver outstanding performance when used as the interfacial layer with PCEs approaching 19%. The results in this work present the promising prospect of non-fullerene small molecule acceptors for application in the PVSC field, and reveal that regulating the energy levels of ETLs is beneficial to maximize the device outputs of VOC and PCE.

Graphical abstract: Energy level-modulated non-fullerene small molecule acceptors for improved VOC and efficiency of inverted perovskite solar cells

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Supplementary files

Article information


Submitted
13 Dec 2018
Accepted
09 Jan 2019
First published
09 Jan 2019

J. Mater. Chem. A, 2019,7, 3336-3343
Article type
Paper

Energy level-modulated non-fullerene small molecule acceptors for improved VOC and efficiency of inverted perovskite solar cells

X. Liu, X. Li, Y. Zou, H. Liu, L. Wang, J. Fang and C. Yang, J. Mater. Chem. A, 2019, 7, 3336
DOI: 10.1039/C8TA12028E

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