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Highly thermal-stable perylene-bisimide small molecules as efficient electron-transport materials for perovskite solar cells

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Abstract

Perylene-bisimide (PDI)-based small molecules (PDI-Ph, PDI-PhCN, PDI-PhCN-2Br and PDI-PhCN-4Br) were synthesized via imidization of perylene bisanhydride and core-bromided perylene bisanhydride. The physical, optical and electronic properties of these molecules were characterized by thermogravimetric analysis (TGA), UV-Vis, X-ray diffraction (XRD), cyclic voltammetry and space charge-limited current (SCLC). PDI-Ph, PDI-PhCN and PDI-PhCN-2Br show excellent thermal stability with decomposition temperatures above 400 °C (610 °C for PDI-PhCN) and high crystallinity with strong π–π stacking. The three molecules also exhibit high electron mobility with average values of 0.169 cm2 V−1 s−1 for PDI-Ph, 0.212 cm2 V−1 s−1 for PDI-PhCN and 0.119 cm2 V−1 s−1 for PDI-PhCN-2Br. Utilizing these molecules as the single electron-transporting layer (ETL), inverted perovskite solar cells with a configuration of ITO/NiOx/MAPbClxI3−x/ETL/Ag were fabricated. A power conversion efficiency of 14.6% was achieved from the device using PDI-PhCN as ETL. Furthermore, when BCP was used as the hole-blocking layer, the identical structured perovskite device achieved a high efficiency of 18.8% for the PDI-PhCN/BCP combination, which was better than the standard cell (17.4%) using C60/BCP as ETL. The superior performance of PDI-PhCN compared to PDI-Ph, PDI-PhCN-2Br and PDI-PhCN-4Br comes from its higher electron mobility and better matched energy levels with that of the absorber MAPbClxI3−x. Our results demonstrate that PDI-based small molecules are very promising electron-transporting materials for highly efficient, low-cost perovskite solar cells.

Graphical abstract: Highly thermal-stable perylene-bisimide small molecules as efficient electron-transport materials for perovskite solar cells

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Supplementary files

Article information


Submitted
05 Sep 2020
Accepted
27 Sep 2020
First published
28 Sep 2020

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

Highly thermal-stable perylene-bisimide small molecules as efficient electron-transport materials for perovskite solar cells

W. Yan, Z. He, J. Jiang, D. Lu, Y. Gong, W. Yang, R. Xia, W. Huang and H. Xin, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC04241B

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