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Perylene Diimide-based Electron Transport Layer Enabling Efficient Inverted Perovskite Solar Cells

Abstract

A 3D type perylenediimide (PDI)-based molecule (TPE-PDI4) is successfully applied as an efficient electron transporting material in inverted perovskite solar cells (PSCs). TPE-PDI4 has been previously demonstrated as an excellent non-fullerene electron acceptor in high-performance bulk-heteojunction polymer solar cells. Considering its decent electron mobility, outstanding solution processability with favorable thin-film morphology, as well as compatible energy levels with perovskite materials, TPE-PDI4 serves as a promising candidate as the electron transport layer (ETL) material for perovskite solar cells. Herein, we report the fabrication of inverted perovskite solar cells using TPE-PDI4 as electron transporting layers. A high PCE of 16.29 % is obtained, which is higher than using PCBM-based electron transporting layer under the same testing conditions. On the other hand, TPE-PDI4 also works well as an interfacial layer between perovskite and C60. A high efficiency of 18.78 % is achieved in PSCs with TPE-PDI4 compared to, a lower efficiency of 16.56 % without this interlayer, indicating an enhanced charge transport/collection with the insertion of TPE-PDI4. Additionally, TPE-PDI4 shows a better water-resistibility than PCBM, which could more effectively protect the perovskite layer beneath. Therefore, devices with TPE-PDI4-based ETL exhibit an enhanced stability. Our results demonstrates the great potential of TPE-PDI4 to replace the expensive fullerene-based ETLs.

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Publication details

The article was received on 25 Jun 2018, accepted on 27 Jul 2018 and first published on 27 Jul 2018


Article type: Communication
DOI: 10.1039/C8TA06081A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Perylene Diimide-based Electron Transport Layer Enabling Efficient Inverted Perovskite Solar Cells

    K. Jiang, F. Wu, H. Yu, Y. Q. Yao, G. Zhang, L. Zhu and H. Yan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06081A

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